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US 5,471,001 AGranted
Crystallization of adipic acid
AssigneeE. I. Du Pont de Nemours and Company
InventorsHoward W. Anderson, John B. Carberry, Harold F. Staunton, Bhagya C. Sutradhar
Life of this patent
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Abstract
Crystallization of adipic acid using low intensity ultrasonic agitation during crystallization results in purer product that is more readily handled. Apparatus for carrying out the process is also disclosed.
Claims10
A process for the crystallization of adipic acid which comprise subjecting an aqueous based mother liquor containing dissolved adipic acid and nascent crystals of adipic acid to low intensity ultrasonic agitation while cooling the mother liquor and/or decreasing the water content of the mother liquor.
An apparatus comprising:
- (a) a vertically mounted cylindrical container having a cylindrical wall, a top, and a bottom, (b) a cylindrical hollow baffle mounted in said container and spaced equidistant from the cylindrical wall of the container, said baffle being also spaced from the bottom and top of the container, (c) means located near the lower end of the cylindrical container for moving mother liquor contained in the cylindrical hollow baffle downwardly, where the mother liquor is diverted by the bottom of the cylindrical container and forced to pass between the inner wall of the cylindrical container and the cylindrical hollow baffle and then over the top of the baffle, and (d) transducer means located in the upper portion of the cylindrical container for transmitting to the mother liquor low energy ultrasonic agitation.
Dependencies are inferred from the claim text.