Process for the removal of urea, ammonia, and carbon dioxide from dilute aqueous solutions
Patent 4410503 Issued on October 18, 1983. Estimated Expiration Date: 
March 1, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
March 1, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3361534 3922222 Vapor compression distillation apparatus and method Process for separating acid gases and ammonia from dilute aqueous solutions thereof Method and the reuse of sewage waters of the combined urea-ammonia installations Patent #: 4327068 InventorsAssigneeApplicationNo. 06/353385 filed on 03/01/1982US Classes:423/359, From elemental hydrogen and nitrogen203/11, Under pressure or vacuum564/69With ammonia synthesisExaminersPrimary: Vertiz, O. R.Assistant: Langel, Wayne A. International ClassesC07C 273/00 (20060101)C07C 273/10 (20060101) C02F 1/02 (20060101) Foreign Application Priority Data1981-02-28 NLAbstractAn improved process for the removal of urea, ammonia, and carbon dioxide from process condensate derived from coupled urea and ammonia syntheses by hydrolysis of urea and desorption of ammonia and carbon dioxide. Process condensate poor with respect to ammonia is treated at a pressure of between about 15 and 42 bar and a temperature of between about 200° C. and 320° C. in a reaction column with steam to form a gas mixture containing ammonia, carbon dioxide, and water vapor, and an aqueous liquid virtually free of urea, ammonia, and carbon dioxide. |
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