Treatment of water vapor generated in concentrating an aqueous urea solution
CA 1064051 A · Owner: Mitsui Toatsu Chemicals, Inc. · Inventors: Inoue, Shigeru; Shirasu, Tadao; Miyakawa, Hisashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Title of the Invention, TREATMENT OF WATER VAPOR GENERATED IN CONCENTRATING AN AQUEOUS UREA SOLUTION, Abstract of the Disclosure A process for treating water vapor generated in concentrating an aqueous urea solution wherein a urea synthesis effluent containing urea, unreacted ammonium carbamate and water from a urea synthesis zone is subjected to a plurality of decomposition stages, the pressures of which stages are stepwise reduced to decompose and separate substantially all of the unreacted ammonium carbamate from the aqueous urea solution. The aqueous urea solution which still contains small amounts of ammonia and carbon dioxide is concentrated to obtain crystalline urea or molten urea …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted October 9, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 9, 1996.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.