Process for purifying the effluent from urea production plants
Patent 5096599 Issued on March 17, 1992. Estimated Expiration Date: 
August 17, 2010. 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.
August 17, 2010. 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 3922222 Method of hydrolyzing urea contained in waste water streams Installation for conducting a synthesis reaction of urea Catalytic method for hydrolyzing urea Process for synthesizing urea Patent #: 4354040 InventorAssigneeApplicationNo. 568984 filed on 08/17/1990US Classes:210/750, Including degassing95/245, By stripping with gas210/765, Including liquid recirculation210/766, Including temperature change210/774, Including temperature change210/805, And recirculating liquid210/903, Nitrogenous422/228, Including flow directing baffle attached directly to reaction chamber wall564/72In plural stagesExaminersPrimary: Hruskoci, Peter A.Attorney, Agent or FirmForeign Patent References
International ClassC02F 001/20Foreign Application Priority Data1989-09-15 ITAbstractA process for purifying the effluent originating from urea production plants, consisting of three successive treatment stages, namely stripping of the volatile components, thermal hydrolyis of the urea and biuret in a plurality of zones traversed with piston flow, and final stripping of the volatile components produced by the hydrolysis. |
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