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Laboratory operation has its own norms, it must abide by objective laws, and there is a price to pay if you don't act in accordance with objective laws
Case 1
A researcher violated the regulations and weighed irritating reagents with peculiar smell on the operation table outside the fume hood.
In the experimental building constructed in accordance with HVAC (heating, ventilation and air conditioning) specifications, the three-stage negative pressure system ensures orderly air supply and exhaust.
Case 2
A R&D personnel reacted as follows:
First dissolve 170g of nitro compound in 1L of acetic acid in a 2L single-necked reaction flask at room temperature, add 150g of zinc powder under stirring at room temperature, and then explode after adding open and stirring for about 2 minutes
Cause analysis: Violation of operating procedures, excessive haste, zinc powder is added too fast, and the heat generated is too late to be discharged, which speeds up the reaction rate
Case 3
When a research and development personnel dispose of waste lithium aluminum tetrahydrogen, they suspended the lithium tetrahydroaluminum in THF in a plastic beaker, and then poured it directly into the bucket of ethyl acetate .
Figure 25-24 Screenshot of the accident video
Lesson: Ethyl acetate is used as a quencher for lithium aluminum tetraoxide, it can only be added drop by drop slowly, or even diluted with THF
Case 4
A certain R&D staff hurriedly washed many flasks with acetone, and then placed them in an oven for drying.
This is caused by the acetone reaching the explosive limit.
Case 5
A researcher who distilled the product after the nitration reaction under reduced pressure suddenly exploded when it distilled to a small amount of residual liquid
Related links: accident factors-careless frizz, paralysis (4)