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. 08, 1983
Filed:
Jun. 19, 1980
Nitto Chemical Industry Co., Ltd., Tokyo, JP;
Abstract
A process for producing acrylamide from acrylonitrile by utilizing a microorganism or enzyme capable of hydrating acrylonitrile into acrylamide in the form of a highly concentrated aqueous solution of acrylamide which comprises bringing acrylonitrile in contact with the microorganism or enzyme in an aqueous medium at a pH of from 6 to 10, at a temperature of from the freezing point to 50.degree. C., and under such conditions that the concentration of acrylamide in the reaction solution after the completion of the reaction is from 5% by weight to less than 20% by weight, and concentrating the resulting reaction solution; this invention further includes an embodiment wherein the reaction solution is concentrated by cooling the reaction solution after the reaction to from -4.degree. C. to -9.degree. C. to crystallize ice, separating the ice, and using the ice so separated for cooling during the hydration reaction. In addition, this invention includes an embodiment wherein the concentrated solution obtained by the above embodiment is further concentrated by evaporating the water contained in the concentrated solution.