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Grignard stalls then runs away

The Incident

During a routine plant preparation of a Grignard, the reaction stalled, too much halide was added to try to get the reaction started, and when it did start there was so much energy released that material was ejected from the reactor.

The Investigation

It was found that the reaction stalled as a second drum of halide was started, this was not the same batch as the first drum.  It appears that the quality of the second drum was not as good, and this is what caused the stalled reaction

Naturally it is known that if too much halide is added then there is a distinct risk of the ensuing reaction being uncontrollable.

Lessons Learnt

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