Process for producing a highly concentrated aqueous acrylamide s

Details Process for producing a highly concentrated aqueous acrylamide s Process for producing a highly concentrated aqueous acrylamide s

1980-06-19

1983-11-08

Kepplinger, Esther M.

Chemistry: molecular biology and microbiology

Micro-organism, tissue cell culture or enzyme using process...

Preparing nitrogen-containing organic compound

435182, 435813, 435819, 435822, 435832, 435840, 435843, 435859, 435872, C12P 1302, C12N 1104, C12R 100, C12R 107, C12R 113, C12R 1265, C12R 1365, C12R 115

Patent

active

044143311

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.

REFERENCES:
patent: 3389567 (1968-06-01), Bevarly et al.
patent: 3624154 (1971-11-01), Robbins et al.
patent: 4001081 (1977-01-01), Commeyras et al.
patent: 4248968 (1981-02-01), Watanabe et al.

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