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Exploding Bottle of Acetone / CO2

The incident

A bottle of acetone, used for cold baths, spontaneously exploded, showering all the laboratory with glass

The Investigation

The lab had used acetone to make a dry ice bath, after they were finished with it, they would let it warm up over night, the acetone was then poured into a safecote bottle for reuse. Some two weeks passed after the last use until the bottle exploded.

There are two theories why this happened.

Lessons

It is not wise to keep reusing solvents over an over again, where solvents have been cooled with dry ice, there is always a danger due to later degassing (acetone dissolves rather a lot of CO2 when cold).  For such solvents storage in less rigid containers would be better.

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