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

What are the impurities present in the acrylonitrile column in the manufacture of acrylonitrile from propylene-ammonia-air oxidation process? Correct Answer Saturated carboxylic cyanohydrin

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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