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:
Jun. 28, 1977
Filed:
Dec. 03, 1975
Applicant:
Inventors:
Shiro Asano, Yokohama, JA;
Kiyotaka Yoshimura, Mobara, JA;
Ryoji Tsuchiya, Kamakura, JA;
Tadatoshi Honda, Yokohama, JA;
Assignee:
Mitsui Toatsu Chemicals, Incorporated, Tokyo, JA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
2605 / ; 159 / ; 159 / ; 159 / ; 159 / ; 159 / ; 159 49 ; 159D / ; 203-8 ; 203-9 ;
Abstract
A method for economically concentrating an acrylamide aqueous solution by catalytic hydration without substantial deterioration in the product. According to the method, an acrylamide aqueous solution obtained from catalytic hydration, is concentrated by distillation while maintaining the solution in good contact with at least 0.1 mole. or more of air per mole of water distilled from the acrylamide aqueous solution.