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.