Process and equipment for the hydrolysis of residual urea in the water from synthesis plants
Patent 5399755 Issued on March 21, 1995. Estimated Expiration Date: 
October 23, 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.
October 23, 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 ReferencesUrea hydrolysis Process for the removal of urea, ammonia, and carbon dioxide from dilute aqueous solutions Process for treatment of urea plant process condensate Method for treating ammonia and urea condensates Patent #: 5223238 InventorAssigneeApplicationNo. 965741 filed on 10/23/1992US Classes:564/63, Urea per se or salt thereof210/750, Including degassing210/752, Plural spaced feedings423/358, From organic material containing nitrogen564/32Ureas (i.e., HNH-CO-HNH, wherein substitution may be made for hydrogen only)ExaminersPrimary: Hollrah, Glennon H.Assistant: Burn, Brian M. Attorney, Agent or FirmForeign Patent References
International ClassC07C 273/14Foreign Application Priority Data1991-10-23 CHAbstractProcess for the hydrolysis of urea contained in the process water from plants for the synthesis of urea consisting of the thermic treatment of the water containing urea and of the removal by stripping of the compounds from decomposition of the urea (CO2 and NH3) in a series of stages in series with superimposed flow.The equipment is a vertical column with superimposed modules with weirs which penetrate in two successive modules and give the solution a rising movement. |
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