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1. 发明授权

US4877594A Purification of phosphoric acid 失效
标题翻译：磷酸的纯化
公开(公告)号：US4877594A
公开(公告)日：1989-10-31
申请号：US283560
申请日：1988-12-13
申请人： Laurence W. Bierman , Michael L. Lopez , James E. Perkins, III
发明人： Laurence W. Bierman , Michael L. Lopez , James E. Perkins, III
IPC分类号： C01B25/46
CPC分类号： C01B25/461 , C01B25/462
摘要： A mixture of hydrophobic and hydrophilic extractants is used to separate phosphate values from impurities found in phosphoric acid. In one approach, impurities are removed from phosphoric acid and the phosphate values are recovered, by introducing polyphosphates and ammonium ions into the impure acid, and contacting the impure acid with a mixture of low and high molecular weight alcohols, one of which is hydrophilic and the other hydrophobic, in a single stage. The phosphate values segregate to the high molecular weight alcohol fraction, and the impurities segregate to the low molecular weight alcohol fraction. After separation of the alcohol solutions, the phosphate values and the impurities are separated from their respective extractant solutions, and the alcohols recirculated. Polyphosphates and ammonia are preferably provided by reacting a portion of the original feed acid with ammonia at elevated temperature in a pipe reactor.
摘要翻译：使用疏水和亲水萃取剂的混合物将磷酸盐与在磷酸中发现的杂质分离。在一种方法中，从磷酸中除去杂质，通过将多磷酸盐和铵离子引入不纯的酸中并将不纯的酸与低分子量和高分子量醇的混合物接触，其中一种是亲水的和另一个疏水，在一个阶段。磷酸盐分离成高分子量醇馏分，杂质分离成低分子量醇馏分。在分离醇溶液后，将磷酸盐值和杂质从它们各自的萃取剂溶液中分离出来，醇再循环。聚磷酸盐和氨优选通过使一部分原始进料酸与氨在升高的温度下在管式反应器中反应来提供。

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