Method for treatment of urea crystallizer condensate专利检索-热分解炉热处理废物处理废物处理与管理专利检索查询-专利查询网

Method for treatment of urea crystallizer condensate

阅读：642发布：2022-04-26

专利汇可以提供Method for treatment of urea crystallizer condensate专利检索，专利查询，专利分析的服务。并且Condensate from a urea crystallizer is directed to a low pressure boiler or heat exchanger and evaporated to accomplish thermal decomposition of urea and any biuret contained therein into ammonia and carbon dioxide which are subsequently removed and recycled to the urea plant, if desired, leaving substantially urea free water of sufficient quality to satisfy environmental regulations or guidelines or for use as boiler feed water.，下面是Method for treatment of urea crystallizer condensate专利的具体信息内容。

权利要求

1. A process for removing nonvolatile contaminants such as urea and biuret from urea plant condensate comprising a mixture of condensed water and very small amounts of urea on the order of about 0.1% of the condensate, said process comprising the steps of introducing said condensate into a low pressure boiler, heating said condensate of water and the urea under conditions of times, low temperatures and pressures which are sufficient to thermally decompose urea essentially completely and thereby decomposing the urea in said condensate into ammonia and carbon dioxide essentially completely vaporizing said condensate, and thereafter separating substantial portions of the ammonia and carbon dioxide from resultant vaporized water of said condensate, by condensing at least a major portion of the vaporized condensate, and stripping ammonia and carbon dioxide from the water in said major portion.

2. A PROCESS, AS DEFINED IN CLAIM 1, WHICH INCLUDES RECYCLING THE AMMONIA AND CARBON DIOXIDE TO THE UREA PLANT.

3. A process, as defined in claim 1, which includes utilizing the water from which the ammonia and carbon dioxide has been separated as boiler feed water.

4. A process, as defined in claim 1, wherein resultant water from said stripping contains a relatively small amount of ammonia, said process comprising the further step of heating said resultant water and venting the ammonia therefrom to the atmosphere.

5. A process as defined in claim 1, wherein the pressure at which the condensate is heated and vaporized in order to decompose the urea is on the order of 10 p.s.i.a.

6. A process as defined in claim 5 wherein said pressure is about 8.4 p.s.i.a.

7. The process as defined in claim 6 wherein the heating and vaporizing of said condensate is conducted at about 185*F.

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Method for treatment of urea crystallizer condensate

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