On March 31, an explosion accident occurred in the Institute of Chemistry of the Chinese Academy of Sciences, and some people were suspected to have died as a result. On April 1, the Red Star News reporter confirmed the news from the staff of the Institute of Chemistry, Chinese Academy of Sciences.

“We are not very clear about the specific situation. To be honest, this matter is very sad.” The staff member said that the explosion occurred, but the deceased was not a researcher. In addition, since the accident has just occurred, the investigation is still underway, and an explanation will definitely be provided in a public manner in the future.

Another netizen asked about this under a Weibo on the official website of the Chinese Academy of Sciences “Voice of the Chinese Academy of Sciences”. The official Weibo replied that “safety first, alarm bells ringing, and cherish life”.

It was reported on the Internet that an explosion occurred in the Institute of Chemistry of the Chinese Academy of Sciences.

Many graduate students in the laboratory now pay much attention to personal protection. They know that poisonous things stay far away, that harmful things should not be fooled around, and that if the fume hood is broken, they will not do experiments immediately. This is a good thing. Now everyone knows the dangers of heating devices and electrical equipment, which is also very good. However, there is a link in traditional safety education that has not been emphasized enough, that is, high pressure. Many safety education materials have mentioned the dangers of high pressure, but they have not emphasized enough, but the danger of high pressure is intangible and is most easily overlooked. There are actually two aspects to the danger of high pressure, high pressure and high negative pressure. High pressure refers to equipment such as high pressure reactors, as well as gas tanks. However, these devices have pressure gauges, and the technology of this kind of thing is very mature. It stands to reason that there is no problem in experimenting with the signs of the pressure gauges. However, I found that some students easily ignore the pressure gauge, and usually use inert gas by twisting the piston. This habit is very bad. As for the autoclave, that thing is even more problematic. An ordinary autoclave can easily reach hundreds of atmospheres. If you do not strictly refer to the pressure gauge’s display operation, the consequences cannot be predicted, and deaths are light. And I don’t expect this accident to mean that the pressure will open the kettle under the reaction conditions. I find it hard to believe. Because there are hundreds of atmospheric pressure on the thread, most people can’t unscrew it at all; even if it can be screwed, such a large stress should be reflected. The pressure of a general hydrothermal kettle can not be unscrewed in two or three times. I guess it’s after the temperature has dropped for a while. Empiricism feels that after putting it for so long as usual, the pressure should be almost relieved. Then I opened the cover without looking at the pressure gauge or even thinking about it, but people estimate the time. It is inaccurate, and there may be other circumstances that cause the pressure to not dissipate so quickly, and the result will be the same as a hard-core armor-piercing bullet. Another aspect is actually less people concerned, which is high negative pressure. When doing separation, various pumps are often used, which are used to pump air to create negative pressure. For example, vacuum distillation requires pumping to lower the boiling point of some high-boiling substances. However, many students do not understand the scope of application of various common air pumps. Commonly used in laboratories are water pumps, diaphragm pumps, peristaltic pumps, and oil pumps. In general, among the various small pumps that can be used in the laboratory, the well-maintained oil pump (oil-sealed rotary vane pump) has the highest vacuum. This has caused some students to use oil pumps for speed, and no buffer is needed. I have even seen the use of oil pumps to remove DCM. Solvents and products are sprayed everywhere, which is very wasteful. And there is a more dangerous problem of misuse of oil pumps. Any glass instrument has its own design to withstand the pressure, this can not be random. For example, the conical flask is often difficult to withstand high negative pressure due to its shape. There is also a glassware with a slight crack, its pressure-bearing capacity will be greatly reduced. If you blindly use the oil pump to pump some utensils that cannot withstand high negative pressure, it will easily cause an explosion. And often this kind of explosion will blow up glassware very badly, causing great harm to people. For the dangers of high pressure and high negative pressure, people in the chemistry laboratory must pay attention to three points: 1. Read the instructions and make sure that the container you operate, whether it is a reactor or glassware, can withstand the corresponding pressure; 2. Looking at the barometer, also pay attention to the scale of the barometer, whether it is KPa or MPa, which is three orders of magnitude away from one word. I’ve heard of someone using MPa meter as KPa meter, thinking it’s all right, and finally a major incident; 3. Listen carefully for air leaks. The sound of air leaks should be regarded as the most dangerous sound signal that can be heard in the laboratory. , Once you hear the sound of air leakage, you should stop the operation immediately, whether it is heating or decompressing, and check the air tightness after the system pressure returns to normal.


By zhiwo

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6 months ago

Chemical related majors. I remember that when I finished the undergraduate course, the senior sister of the laboratory, Qian Xingwan, told him: Brother, the reactor must be flushed in the sink for more than half an hour, and the reactor should be opened again at intervals. (Not rigorous enough, the correct way is in the back) Once I synthesized nanocrystals in the laboratory, the schedule was in a hurry. After the reaction kettle is reacted at 200 degrees for 6 hours, take the reacted, washed, and centrifuged nanocrystals for another two hours to take an electron microscope for morphological characterization. End the reaction on time in 6 hours, and let it stand for half an hour in a water tank with flushing water as required. One hour before the electron microscope was taken, I was going to open the reaction kettle. At this time, the reaction kettle was basically at room temperature, and it didn’t feel much to the touch. However, when I carefully unscrewed the top nut, an uncontrollable force rushed out of it. The nut played a set of air-turning in front of my eyes and bounced on the table. The reactant exhaled instantly and splashed me all over. Fortunately, the substrate composition is relatively mild, weak acid and low toxicity. However, the red solution still made my white coat a heroic sacrifice… I took the reaction kettle with only 1/3 of the solution left and wore a “blood-drenched” white coat to the centrifugal laboratory. The return rate was 100%.. .Hydrothermal reactor The hydrothermal reactor should be the most commonly used type of pressure vessel in chemical laboratories, and it looks harmless to humans and animals on the surface. However, when it reacts for a long time at high temperature, a large amount of generated gas is stored in the abdomen, and the internal pressure becomes very large, even up to several megapascals, far exceeding atmospheric pressure. It is a real time bomb. Generally speaking, after confirming that the intra-abdominal temperature is lower than the boiling point of the solvent of the reactant system, the lid of the kettle can be opened for subsequent operations. However, due to the complicated conditions in the reaction kettle (ordinary hydrothermal kettle, autoclave, etc.), in addition to the commonly used water and organic solvents, there are also many gases with lower boiling points. Therefore, when you feel that it is not too hot to open the cap directly, it is very likely that the internal pressure is still accumulated several atmospheres. In this case, as soon as the nut is loosened, the pressure difference between the inside and the outside is enough to open the nut. If the pressure difference is too large, it is like a bullet with a huge diameter launched into the air. If the experimenter stands nearby, it is likely to hit the head. If it is a higher pressure autoclave, the impact will be stronger, which should be the reason why the graduate student died unfortunately. Personal experience, no matter what the reaction is, you must first stand still in the water tank for at least half an hour to cool down, and then wait for more than an hour to open the kettle, and it must be opened in a fume hood. The ghost knows what poisonous gas is in the kettle after the reaction. Of course, some friends in the comment area pointed out that when the reaction kettle was just taken out, the temperature was high, and it would be easy to wear the kettle body directly and accelerate the corrosion. Moreover, the thermal conductivity of the PTFE lining is low, and the temperature of the solution may be possible after the outer wall is cooled by cold water. It is still relatively high and there is a certain risk. Therefore, the more correct/safe operation should be: After taking out the reaction kettle, let it stand for natural cooling in a fume hood, and then open the kettle after the temperature of the kettle body reaches room temperature. (The gasket at the bottom of the kettle will loosen after the pressure is released, and it can also be used as an indicator for opening the kettle) The more commonly used experimental scheme is: do the reaction during the day on the first day, take the reaction kettle out to cool down before leaving the laboratory at night, and the next morning Open again. Provide sufficient time for cooling and pressure relief, which not only saves time, but also avoids the risk of explosion during the opening of the reactor. In addition, the internal pressure of the hydrothermal reactor during the reaction is even more alarming, so the gasket must be correctly inserted before the high-temperature heating device is placed, and then the screw cap of the reactor must be tightened with a screw. Otherwise, when you turn on the heating device (such as the oven) again, you will find that your reaction kettle is different from the body, and the solution inside has already become the inner wall coating of the oven… Undergraduate and graduate students, you will see colleges and universities every year There was an experimental accident in the chemical and chemical laboratory here, and many young lives were fleeting, and it was extremely distressing. Inadvertently, the experimenters of biochemical and environmental materials have become a high-risk industry. In fact, this is related to the lack of systematic and long-term safety education in many laboratories. Everyone has experience. Most laboratories have to take a laboratory safety test before entering the laboratory, but they are basically written tests, which are of little practical educational significance. Go to the back and enter the laboratory, the usual operation is basically tested consciously. However, in order to catch up with the progress, the reaction kettle was opened while it was still hot; the water bath was always on and the reaction person was not nearby, and the water was already boiled off the next day, and there was smoke. When doing the reaction, play with the mobile phone and connect the gas circuit. I don’t know if it’s wrong. It’s too late to discover that the inert gas has been connected to hydrogen. After doing corrosive experiments, I felt uncomfortable to put on a gas mask. I directly exposed my face and splashed with the liquid. The consequences were self-recovery… Countless cases tell us that safety regulations must be emphasized at all times, maintained at all times, and must not be relaxed at all times. Although a bit of an official tone, laboratory safety is really not a trifle. Therefore, everyone must always sound the alarm in their hearts. As soon as you enter the laboratory, please let go of your luck. All experimental procedures are as far as possible in accordance with the standardized procedures and operating manuals. Especially when it comes to high-temperature, high-pressure, corrosive and toxic experiments, you must be careful every step of the way. Suddenly, it may really be wiped out. I remember that I visited Yanshan Petrochemical during my internship. This slogan is vivid and thought-provoking: Everyone engaged in dangerous reactions and materialization processes, when you enter the experimental area, please give up all autonomy, strictly abide by various operating procedures and guidelines, and stay away from fluke. Don’t be careless. Everyone cherishes it.

6 months ago

First of all, I hope the deceased will rest in peace. Regarding the specific cause of the accident, there are two theories, one is the explosion of the reactor, and the other is the explosion of the hydrothermal kettle. Let me briefly tell you the difference between the two types of equipment. In fact, these two types of equipment can be used for high-pressure reactions. If you must say the difference, the hydrothermal kettle has a simple structure and the reaction kettle is more complicated. The left side of this picture is the hydrothermal kettle, and the right side is the reaction kettle. These two types of equipment are generally made by hollowing out the middle with a single piece of steel rod. The wall thickness is very thick and the pressure bearing capacity is very strong. Under normal circumstances As long as the explosives are not boiled in the reaction kettle, the whole kettle will not be blown up. At most, the lid will fly out or the materials will spray out. The last time I myself was from deleting my account and re-training was when the pressure gauge of the reactor flew out and almost had a headshot. The biggest difference between the two is that the structure of the hydrothermal kettle is too simple. In fact, it is a pot that can be sealed, with tetrafluoroethylene as an anti-corrosion lining. When in use, add various materials to the kettle, and then heat it in a water bath or an oil bath. This equipment is generally used for high temperature and high pressure reactions that do not require stirring. The price of the hydrothermal kettle is relatively cheap, about a hundred dollars. A laboratory can buy multiple at the same time, and the experiment is conducted in parallel, and the efficiency is still relatively high. But the key point is that the structure of the hydrothermal kettle is too simple. In order to reduce costs, the simplest hydrothermal kettle has no pressure gauge, no pressure relief valve, no temperature probe, not to mention measures such as safety valves and rupture discs. Therefore, some answers mentioned that the victim was killed by the lid of the water-heated kettle because the water-heated kettle was not completely cooled. In fact, the water-heated kettle was forcibly opened under high pressure. If it is a hydrothermal kettle, it is indeed possible, because there is no instrument to tell you whether the temperature in the kettle has completely cooled down and what the pressure is. What’s more, it is possible that water cooling is directly carried out during the operation, causing the water heating kettle to be actually cold outside and hot inside, which is more prone to judgment errors. In the final analysis, the structure of the hydrothermal kettle is too simple. In fact, there are some more complicated hydrothermal kettles on the market that can be equipped with pressure gauges and pressure relief valves, and the price is a little more expensive. As long as there is a pressure gauge hanging on the hydrothermal kettle, telling people that the pressure inside is 70 kilograms, or there is a pressure relief valve, you can manually open the valve first to reduce the pressure, and such a tragedy will not happen. Another fascinating thing is that if there is pressure in the container, it is actually difficult to open either the reaction kettle or the hydrothermal kettle by means of manpower. It is unbelievable that a girl can open the cauldron in this situation. Relatively speaking, the structure of the reactor is much more complicated. First of all, the reactor has agitation. The original agitation is the place where leakage is relatively easy. However, the laboratory-scale autoclave generally uses a magnetic coupling with agitation, so the problem is not big. In addition, the reactor itself refers to the design of some pressure vessels. In addition to the pressure gauge and thermometer, there are safety measures such as safety valves and bursting discs. In addition, the reactor generally has a pressure relief valve. If the user is eager to open the kettle If you look at the results of the experiment, you can actually open the pressure relief valve to slowly release the gas in the reactor, and the reactor can be opened normally when the pressure reaches normal pressure. It can be said that if there is a low-level error in the process of using the reactor to dismantle the kettle under pressure, it is completely that the user’s safety awareness is not in place. Of course, although the reactor safety measures are relatively in place, I think there will still be safety hazards in the actual laboratory use process. First of all, when designing the reactor, some teachers with a background in chemistry will not refer to the relevant regulations at all. The designed reactor scheme is flawed, and some people don’t even know that a safety valve should be equipped. In addition, there is a common phenomenon that the relief valve of the safety valve is not connected to the outside. This is related to the planning of the laboratory. The so-called safety valve is a special valve, which is the one next to the pressure gauge in the figure above. Similar to our pressure cooker, if the pressure in the reactor exceeds a dangerous value, this valve will open to discharge the gas in the reactor. However, in reality, the safety valve design of many experimental reactors is unreasonable. The exhaust is directly indoors. If it is toxic and harmful gas, it will endanger human health. If the gas contains flammable and explosive gas, it may be directly discharged into the room. The indoor electrical appliances detonate, so that the safety valve becomes a dangerous valve instead. What’s even more funny is that when some people design the reactor, the position of the safety valve is facing the person. You can screw a valve in front of the reactor and copy the data. The safety valve is directly facing your face. The safety valve takes off and the high-temperature and high-pressure gas directly greets people’s faces. The design is extremely unreasonable. There is also a problem that cannot be ignored, that is, if you refer to the pressure vessel regulations, the instruments of this high-pressure vessel, including thermometers, pressure gauges and safety valves, must be checked regularly. Because the instrument will be broken, it will fail, we must always make sure that they are in normal working condition. But in reality, in actual scientific research and production, almost no one, including myself, would ignore this problem. When everyone is busy with scientific research tasks and projects, who would have the mind to consider this issue. But this is a potential safety hazard. When I was a graduate student, there was an accident in the next laboratory. The cause of the accident was very simple. Crystallization occurred during the reaction. After a long time, the crystallization blocked the pressure gauge and safety valve pipeline. , This valve failed, and the lid of the kettle was directly topped. In fact, the laboratory should pay more attention to the inspection of the instrument, because the experiment is performed frequently, and the material situation is complicated and changeable. In the end, there are many irregularities in the operation of the students, and the wrong screw force may affect the instrument and equipment. Life expectancy leads to an increase in the failure rate. In this case, more attention should be paid to the inspection of the instrument. There is also the problem of corrosion. In chemical and chemical laboratories, a set of equipment is often used for multiple reactions. The material of the equipment may not meet the needs of all tests, and there will be a phenomenon of “just do it once or twice, it doesn’t matter”. Existing equipment may be corroded after long-term operation. In fact, uniform corrosion is also good. The more terrifying thing is local corrosion. When I was working before, an old engineer told me about such a case. A reactor leaked, and the whole body was almost intact, but there was a very small crack at the bottom. This kind of local corrosion is very hidden and dangerous. Experimental safety accidents can be said to be impossible to prevent. When we go to school, we will more or less hear news about where people have died again. If you want to improve, I think there are a few points that you can actually pay attention to: 1. The laboratories in colleges and universities are too crowded due to various reasons. A space of 60 square meters can accommodate two rectification devices, two chromatographs, two reactors, and more. A muffle furnace, there are several other equipment, can also make people work. Such a crowded environment is prone to stumbling, mixed materials, and leakage of water and electricity. Moreover, the crowded and messy environment is not conducive to the equipment maintenance mentioned before. 2. Due to various reasons, or because of business or academic orientation, many research group projects are too complicated. A set of reactors serves different reaction materials and conditions. The personnel will do this today and do that tomorrow, which invisibly enlarges the equipment. The probability of failure, so everyone often thinks that the equipment is easy to break. Three graduate students repair the equipment in two years. This is the case. At the same time, if the personnel are not concentrated, the possibility of error is greater. In fact, I think universities don’t do a lot of topics, and it’s useless to do it anyway. 3. Then, safety education should not only be done once at school or after an accident. It should be done regularly. Everyone is inert, and everyone knows fritters. After safety education a month after the safety education, it will start to be carefree. This is normal. Human psychology should be like this, so safety education should be done regularly and often. 4. It is still recommended that the chemical and chemical laboratory should be equipped with specialized mechanics and electricians. It is also possible for several research groups to share one. I know that many professors of the older generation had limited conditions at the time. When they were studying, they repaired the equipment and picked up the electricity by themselves. They might think that for the current graduate students, this will not be possible or that, as if they are degraded. However, from the perspective of efficiency, there is a specialization in the technical industry. If a student is a graduate student for three years, he can’t do something for two years because of equipment problems and then repair the equipment, it is a real waste. In the end, I still hope to spend some money to get the equipment for the experimenters. If the water-heated kettle exploded according to other answers, the tragedy will not happen if the kettle is equipped with a pressure gauge.

6 months ago

I have burned thousands of kettles. The burning of kettles has always been the hardest hit area in the chemistry field. The dangers cannot be prevented. Whether it is the high pressure or the water heat in this accident, something will happen every once in a while. Avoid it. The specific reasons are 1. The burning of the kettle is quite fascinating. The person who burns doesn’t know what the burning is, what is the reaction mechanism of the burning process, and what intermediate components are there, so it is difficult to judge whether it is dangerous before opening the kettle. The other is that the influencing factors of the kettle are also fascinated. For example, the reaction kettle loses rust and blocks the thread during the burning process, and it cannot be screwed. The danger of the kettle burning is difficult to prevent. 2. Now the space for the kettle burning is getting smaller and smaller. , The things that were burnt in a satisfactory manner have been burned by others, so many design experiments of the kettle will pursue extreme environments. Adding a little hydrofluoric acid, concentrated nitric acid, and concentrated sulfuric acid is common. Sometimes the kettle is washed with boiled nitric acid. The danger of burning the kettle is getting fiercer. 3. Many students are forced to burn the kettle due to fatigue, especially the one that burns a large piece of it. It is easy to mix things up when the kettle is tired. (Fudan’s kettle burning students mistakenly used ethanol for water). Furthermore, burn the kettle. It is repetitive work. It is easy to be absent-minded and forget the safety precautions when you are tired and burn the kettle. 4. The laboratory arranges the experiment plan too tightly. It is filtered on Wednesday, tested on Thursday, or must be processed in the morning, washed the kettle in the afternoon and added medicine, and put it in the second pot at night. It is strange that the students are not in a hurry. None of the above factors can be completely avoided, and students should not think that as long as they operate by themselves, the danger can be avoided. The danger of burning a cauldron is as metaphysically as your results. Inhalation hazard, liquid splash hazard, corrosion hazard, there is always one that suits you. Finally, let me tell you how terrible the chemical accident is. The death toll from the explosion of a chemical plant in Xiangshui is close to the death toll from the Ya’an earthquake. Are you afraid?

6 months ago

Under normal circumstances, most people will follow the traffic rules when going out on electric vehicles.
But if you are a takeaway boy trapped in the system, and the original 30-minute journey must be delivered in 20 minutes, then I am afraid that you will not care about the traffic rules. Examples of the takeaway boy violating traffic rules and even accidents are everywhere.
Graduate students of the Chinese Academy of Sciences will not be ignorant of laboratory safety, but they may not be concerned about safety.

6 months ago

I am not a chemistry professional, and I may not have much say in how to prevent similar accidents in specific experiments, but I have a little intuitive understanding of how terrible chemical safety accidents are. When I was in the clinical rotation and was out of the night shift of emergency surgery, I encountered a victim of a chemical experiment accident. This victim is a PhD in a biochemistry laboratory of our school. According to her age, she should be regarded as my senior sister. The senior sister did the experiment alone in the middle of the night (researchers in many experimental disciplines have this habit), but I don’t know if it was because of the reaction parameters or the catalyst. A reactor in use exploded, and a lot of glass fragments were carried with them. The reaction liquid sputtered towards her. The senior sister was facing the reaction vessel and was caught off guard, but subconsciously blocked it with one hand in the direction of the spatter. Fortunately, her block blocked most of the debris and liquid sprayed to the head and face, also because the biochemical reaction experiment is generally relatively mild, unlike the chemical reaction that has a large amount of high temperature and high pressure environment. In addition, she also wears goggles in accordance with safety regulations, plus her myopia, which is equivalent to the protection of double glasses. Therefore, the elder sister not only saved her life from danger, she even came to the emergency room by herself. If it were not for these “lucky factors”, I am afraid that she would not have the opportunity to come to the hospital to see me, and I would not have the opportunity to know the cause and effect of this incident, but would see a piece of news on the Internet like today. Unfortunately, in that subconscious block, one of her hands was sprayed directly by those splashes. Not only was a large number of glass fragments embedded in the palm surface and forearm, but also many reaction drugs and other substances entered the wound. So, that night, I was able to spend a night shift of “doing my best”-from one o’clock in the morning to eight o’clock in the morning, I was in the surgical treatment room with another one on duty, bending over to debride her all night. At the beginning, I was “interestedly” counting how many glass shards could be cleared out, but when the hundredth glass shards were cleared, everyone was already in a bad mood. On the one hand, they were almost unable to stand up. I don’t know how many glass shards in the wound are waiting for us behind, I just want to quickly clear out all that can be cleared…In short, when the debridement is basically clean, we make a mess of the small disposal room. ——I used 20 small bottles of hydrogen peroxide to wash the wounds, and gauze sutures were everywhere, as well as the large and small pieces of a whole curved plate. When we finally came out, the two of us on duty almost all came out by supporting the wall-the back pain was so bad that we couldn’t stand up. Fortunately, it was not in vain in the middle of the night, nearly a hundred wounds on the hands and forearms of the senior sister were debrided. It’s just that, maybe because of part of the drug reaction, the senior sister told me that some of the wounds showed persistent non-healing, but fortunately, the Jishuitan Burns Department was very powerful. After nearly half a year and several skin grafts, the senior sister later got it. A relatively good recovery. When I think about it later, I still feel scared-if there was no subconscious block, if there was no goggles, if the high temperature and high pressure experiments in the news were conducted at that time, if the arms were turned into briquettes. The wound is deeper, if the reagents in the reactor are highly toxic drugs… I am afraid I would not have such a “unique experience” of debridement and cleansing overnight, but with everyone, I have seen the accident news from my alma mater. It is precisely because of this kind of story and my innate attribute of “hand shaking” that I have always maintained a full awe of various laboratories, because I know that even any illegal operation and safety negligence in a mediocre experiment are behind. What kind of price might it be? Even if you are not dead, a little “skin wound” may make you unhappy. What’s more, the high-energy “bomb” in the high-temperature and high-pressure experimental environment in this news. Perhaps for the victims of this accident, the only “lucky” I can think of is the moment when he was hit on the head by a heavy kettle cover pushed by dozens of atmospheres, because of the instantaneous damage to the central nervous system, which was about Can’t feel any pain…

6 months ago

It’s only people who see the destruction of the world, and the chronic harm of this industry to people is often overlooked. In a major explosion accident at the Nankai Chemical Building in 2011, a female doctor who graduated half a year ago was injured, her face was completely disfigured, and three fingers were broken. Later, I saw it once in school. I wore a piece of gauze to cover the part below my eyes, but there were obvious burn marks on my forehead, which was destroyed in my life. There are too many other minor incidents. In the past, the constant temperature oven used for drying was controlled by mercury thermometers. After the mercury thermometers were broken, they were scattered at the bottom of the oven and could not be seen at all. As a result, the students were poisoned by mercury vapor, which could not be checked. To who broke the thermometer in the first place. The laboratory building is filled with a strange smell all year round, the more common ones are acetone, ethanol, ammonia, etc. Don’t talk about fume hoods, Nankai Institute of Materials Science is newly built, the whole building and the equipment inside are new, and it still smells strange all the year round. It turns out that I have used furan and pyridine (which can cause infertility), crotonaldehyde (highly toxic), and phosgene (the famous chemical weapon used on the battlefield) as a byproduct of the experiment. Due to the need for ventilation, the laboratory is cold in winter and hot in summer. In winter, the cold wind blows from the north. I wash the beaker with bitter cold water. After tens of seconds, my hands will freeze and I need to warm up for a while and then wash again; The heat, wearing a white coat, and wearing a mask when necessary to do experiments, sweating. Back then, a classmate of our class sent a graduate student to the laboratory for an experiment. He found a rash all over his body. He recovered after leaving the laboratory for a few days. Finally, he was unable to transfer to a tutor. Many students who did experiments have mentioned that eating is becoming less and less smelling, and they suspect that the sense of smell is impaired. I remember one time when I went to the laboratory early in the morning, there was an obvious smell of ammonia in the hallway. At that time, only one of the students in the group next door was doing the experiment. I told him that your ammonia leaked, and the other party asked me: You smell it Smell? There are so many such disgusting things. There are not many vicious accidents. It is more of imperceptibly impairing your health. It is difficult to say that a leukemia or cancer will be detected in twenty years. Who do you call to reason? Tell me about the safety accidents that I have encountered on the road of chemistry in the 12 years since university

6 months ago

Waiting for the official announcement, the deceased rest in peace. This incident may not only be a chemical accident, it may also be a liability accident. When the incident occurs, it should be reported in accordance with the reporting process at present, then the local emergency management department and the Institute of Chemistry of the Chinese Academy of Sciences should adopt corresponding procedures to form an investigation team for investigation. If the investigation concludes that there is responsibility after the incident, then the relevant responsible persons, including but not limited to the main person responsible for the accident, the personnel responsible for the management of the relevant chemical equipment, etc., will be filed for investigation, and criminal responsibility may be pursued. Hazardous chemicals themselves are highly flammable and explosive. For the supervision of the use, experimentation, storage, procurement, transportation, storage, and waste disposal of such hazardous chemicals, there should be a set of complete and effective safety management and supervision measures. It is estimated that this time the Institute of Chemistry of the Chinese Academy of Sciences needs to rectify and rectify, and strengthen supervision, otherwise these are time bombs that can kill people.

6 months ago

Scientific research institutions should not make the mistake of underestimating students in their speeches and boldly speculate that the media saw news of the death of a researcher and asked the staff: Did the explosion cause the death of the researcher? The staff is more rigorous: the deceased was a student, not a researcher. Media: The staff responded that the deceased was not a researcher. Good guy, the rhythm is up. The above is purely a guessing ball with no basis in fact.

6 months ago

Ah, when I was in school, I often used the reactor, probably thousands of times. Seeing such news, I feel very sad, the deceased rest in peace. Although the temperature of this thing is not high, the pressure inside it is huge when it is heated (this is the purpose of the design). If the temperature exceeds the specified temperature (for example, if you calibrate it to two hundred degrees, you heat it to two hundred and five), there is a danger of explosion. The freshman in the next laboratory used a muffle furnace to heat the reactor to six hundred degrees. The reactor directly blasted the entire muffle furnace. Fortunately, it was in the middle of the night and there was no one on site. There is also a risk of opening the reactor without sufficient cooling. Someone cools down with water after the reaction. This is very dangerous, because after the outer metal shell is cooled by water, the temperature and air pressure inside the lining are still high, and when the lid is opened, strange high-temperature steam may be sprayed on the face. The use of reaction kettles can cause danger, which may be caused by unfamiliarity with the relevant regulations, or it may be inappropriate to do too much. Before use, check whether it can be tightened, confirm the temperature before putting it in the oven, and after the reaction, be sure to cool to room temperature before processing. If everything is normal (the quality of the reaction kettle is ok, and it has been tightened before the reaction), then after cooling down, this thing should be easily unscrewed. Don’t push it hard if you screw it hard, either it’s not cold enough inside, or the thing is about to break. Think of something and add it again, safety in production is greater than the sky.

6 months ago

The deceased rest in peace. I think what this matter needs is detailed investigation, official notification, responsibility determination, how to deal with and how to deal with it instead of a group of people making noise on the Internet, using the topic to criticize the chemistry discipline, further amplify the contradiction, and what mentor suppresses. High chemical risks have come out. The safety of experiments is greater than the sky. When people always make mistakes, accidents are inevitable. There will be several plane crashes every year. No matter how safe the security is, there will be homicides. It’s not over. It’s really something that should be scolded. What happened can’t be repeated. You can only learn from the accident and improve safety protection measures. The most feared thing is that you want to cover up when an accident occurs. It is not advisable to cover your ears and steal the bell.

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