Process for purifying lactams

Details Process for purifying lactams Process for purifying lactams

2007-09-18

2007-09-18

Drodge, Joseph (Department: 1723)

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

C023S299000, C023S301000, C210S749000, C210S669000, C210S806000, C540S485000

Reexamination Certificate

active

10169111

ABSTRACT:
A process is described for purifying lactams, in particular the lactams obtained by cyclizing hydrolysis of an aminoalkylnitrile, and more particularly to the purification by crystallization of ε-caprolactam obtained by cyclizing hydrolysis of aminocapronitrile. This crystallization is carried out on the cyclization reaction medium after hydrogenation, removal of volatile compounds, and treatment with an ion-exchange resin.

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Search Report issued in International Application No. EP 0 943 608 A1.

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