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1965 Cook US3211788 Biuret control in urea process

This invention relates to the production of solid urea from anhydrous urea melt. An improved method of processing the urea melt has been developed, which permits retention and transfer of the molten urea without biuret formation. Anhydrous ammonia is employed to form a liquid urea-ammonia solution, which remains liquid at reduced temperatures thus avoiding biuret formation.

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