Purification of caprolactam

Details Purification of caprolactam Purification of caprolactam

2007-05-15

2007-05-15

Kifle, Bruck (Department: 1624)

Organic compounds -- part of the class 532-570 series

Organic compounds

Unsubstituted hydrocarbyl chain between the ring and the -c-...

C540S540000

Reexamination Certificate

active

10534802

ABSTRACT:
A process for removing high boilers from crude caprolactam which comprises high boilers, caprolactam and in some cases low boilers, and which has been obtained bya) reacting 6-aminocapronitrile with water to give a reaction mixtureb) removing ammonia and unconverted water from the reaction mixture to obtain crude caprolactam,which comprisesc) feeding the crude caprolactam to a distillation apparatus to obtaina first substream via the top as a product anda second substream via the bottom,by setting the pressure in the distillation in such a way that the bottom temperature does not go below 170° C., andadjusting the second substream in such a way that the caprolactam content of the second substream is not less than 10% by weight, based on the entire second substream.

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