The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 24, 1981
Filed:
May. 21, 1980
Applicant:
Inventors:
Jun Saitoh, Kamakura, JP;
Kenzo Fujii, Kamakura, JP;
Toshimi Nakagawa, Kamakura, JP;
Tadatoshi Honda, Fujisawa, JP;
Takatoshi Mitsuishi, Isehara, JP;
Hiroshi Itoh, Yokohama, JP;
Assignee:
Mitsui Toatsu Chemicals Incorporated, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
564206 ;
Abstract
A process for purifying an aqueous acrylamide solution which has been obtained by catalytic hydration of acrylonitrile with water in the presence of a copper-containing catalyst is disclosed, said process comprising passing said solution through a weakly basic anion exchange resin having primary and/or secondary amino groups, said resin being replaced with a new one after the use without regeneration.