Distillation: processes – separatory – With chemical reaction – Including step of adding catalyst or reacting material
Reexamination Certificate
2002-08-23
2009-11-10
Manoharan, Virginia (Department: 1797)
Distillation: processes, separatory
With chemical reaction
Including step of adding catalyst or reacting material
C159S047100, C203S014000, C203S029000, C203S091000, C540S540000
Reexamination Certificate
active
07615137
ABSTRACT:
A continuous process is provided for recovering caprolactam from aqueous caprolactam product which includes (i) caprolactam, (ii) impurities, and (iii) water by (a) adding alkali hydroxide to the aqueous caprolactam product, in an amount of not more than 100 mmol alkali hydroxide per kg of caprolactam; (b) reacting at least part of the added alkali hydroxide to form alkali amino caproate, to obtain a caproate-enriched caprolactam product; and (c) distilling the caproate-enriched caprolactam product at reduced pressure.
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Publication 1: Japanese Patent Application Laid-Open No. 7-330720, Dec. 19, 1995 (D1).
Publication 2: Kagaku Jiten by Tokyo Kagaku Dojin, 3rdEd., Oct. 1, 2994 (D2).
Haasen Nicolaas F
Hangx Gerardus W A
Jetten Arnold G M
DSM IP Assets B.V.
Manoharan Virginia
Nixon & Vanderhye P.C.
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