Method for treating ammonia and urea condensates
Patent 5223238 Issued on June 29, 1993. Estimated Expiration Date: 
January 16, 2012. 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.
January 16, 2012. 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 ReferencesProcess for concurrently treating process waste waters and flue gases from ammonia synthesis process plants Urea hydrolysis Process for the removal of urea, ammonia, and carbon dioxide from dilute aqueous solutions Process for treatment of urea plant process condensate Patent #: 4552979 InventorAssigneeApplicationNo. 821209 filed on 01/16/1992US Classes:423/359, From elemental hydrogen and nitrogen564/69, With ammonia synthesis564/73Purification or recoveryExaminersPrimary: Langel, Wayne A.Attorney, Agent or FirmInternational ClassesC01C 001/04C07C 273/00 AbstractA method is described which enables ammonia plant process condensate contaminated with ammonia, carbon dioxide and methanol and urea plant condensate contaminated with urea, ammonia, carbon dioxide and other combined forms of ammonia and carbon dioxide to be simultaneously converted, in a single treatment vessel, substantially and continuously to a vaporous stream rich in ammonia, carbon dioxide and methanol and an liquid stream poor in ammonia, carbon dioxide, methanol and urea. The vaporous stream thus produced is recycled and employed as a feedstock in the reforming section in the ammonia plant. |
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