Process to prepare .epsilon.-caprolactam from 6-aminocaproic aci

Details Process to prepare .epsilon.-caprolactam from 6-aminocaproic aci Process to prepare .epsilon.-caprolactam from 6-aminocaproic aci

1996-02-23

1998-07-14

Bond, Robert T.

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

Organic compounds

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

C07D20108

Patent

active

057806233

ABSTRACT:
Process to prepare .epsilon.-caprolactam starting from a liquid aqueous mixture containing an alcohol and 6-aminocaproic acid by cyclization of 6-aminocaproic acid in the aqueous mixture at an elevated temperature. The alcohol is separated from the starting aqueous mixture before performing the cyclization to such extent that the concentration of alcohol in the aqueous mixture during the cyclization is less than 1 wt. %. The advantages include reduced amounts of undesirable by-product.

REFERENCES:
patent: 3485821 (1969-12-01), Sheehan
patent: 3988319 (1976-10-01), Mares
patent: 4731445 (1988-03-01), Hutmacher et al.

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