Process for the purification of caprolactame

Details Process for the purification of caprolactame Process for the purification of caprolactame

1980-02-19

1982-04-27

Sever, Frank

Distillation: processes, separatory

With chemical reaction

Including step of adding catalyst or reacting material

203 71, 203 91, 2602393A, B01D 334

Patent

active

043269257

ABSTRACT:
A process for purifying caprolactame by continuous and/or discontinuous (or atch) vacuum distillation comprises a first stage fast vacuum distillation of the raw caprolactame possibly in the presence of an alkaline and/or alkaline-earth hydroxide, a second stage consisting of a vacuum rectification distillation of the caprolactame obtained in the first stage and a third stage consisting of the fast vacuum distillation of the caprolactame yielded from the second stage, in the presence of an alkaline and/or alkaline-earth hydroxide. The hydroxide amount in the third and possibly the first stage distillation as well varies from 0.05 to 5% preferably from 0.1% to 1%.

REFERENCES:
patent: 3156683 (1964-11-01), Chandler
patent: 3179657 (1965-04-01), Naglieri
patent: 3904609 (1975-09-01), Mattone et al.
patent: 4148793 (1979-04-01), Danziger et al.

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