Abstract: Cyanuric acid is mechanically separated such as by filtration, centrifugation, or centrifugal filtration from a slurry of cyanuric acid, urea, biuret, and an inert solvent in which the urea is soluble at temperatures above about 170.degree. C. to reduce the urea content of the recovered solid cyanuric acid. The biuret and solvent content of the solid cyanuric acid is also reduced.
Type:
Grant
Filed:
March 31, 1980
Date of Patent:
August 4, 1981
Assignee:
FMC Corporation
Inventors:
Basil A. Guiliano, Henry A. Pfeffer, Andrew D. Kurtz
Abstract: Anhydrous cyanuric acid containing amounts of occluded solvent is recrystallized to a purified cyanuric acid dihydrate by slurrying the contaminated anhydrous cyanuric acid in an aqueous medium.
Abstract: Excess water, both crystalline and non-crystalline, is removed safely and rapidly from active chlorine compounds by applying electromagnetic energy with frequencies lower than infrared to vaporize the excess water.
Type:
Grant
Filed:
October 1, 1979
Date of Patent:
February 3, 1981
Assignee:
FMC Corporation
Inventors:
Sidney Berkowitz, James L. Manganaro, Charles V. Juelke
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