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What are the impurities present in the acrylonitrile column in the manufacture of acrylonitrile from propylene-ammonia-air oxidation process?

(a) Saturated alcohol

(b) Saturated carboxylic isocyanide

(c) Saturated carboxylic cyanohydrin

(d) Dust particles

I had been asked this question in a job interview.

My question comes from C3 Compounds in division Synthetic Organic Chemical Industries of Chemical Technology

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Correct choice is (c) Saturated carboxylic cyanohydrin

To explain I would say: Impurities in the final acrylonitrile column which give trouble are saturated carboxylic cyanohydrins (HO-R-CN). These dissociate to form volatile contaminants.

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