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PROCESS FOR PRODUCING HIGH-PURITY AQUEOUS UREA SOLUTION IN UREA PRODUCTION PROCESS
PROCESS FOR PRODUCING HIGH-PURITY AQUEOUS UREA SOLUTION IN UREA PRODUCTION PROCESS
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机译:尿素生产过程中高纯度尿素溶液生产方法
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摘要
The present invention relates to a method for producing a high-purity aqueous urea solution, utilizing a urea production process at least including a urea synthesis step of synthesizing urea from a raw material feed to produce a urea synthesis liquid, and a urea purification step of purifying the urea synthesis liquid to produce an aqueous urea solution with high urea concentration. The present invention includes a urea crystallization step of separating a part of the urea synthesis liquid and/or a part of the aqueous urea solution and crystallizing urea contained in the separated urea synthesis liquid and/or aqueous urea solution to produce solid crystal urea, and a mixing step of mixing the crystal urea with water to produce a high-purity aqueous urea solution. A high-purity aqueous urea solution to be produced is an aqueous urea solution with high purity suitable as a reducing agent for SCR.
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