公开(公告)号：US4461913A

公开(公告)日：1984-07-24

申请号：US376809

申请日：1982-05-10

申请人： Harry T. Lewis ,  Ewell F. Dillard

发明人： Harry T. Lewis ,  Ewell F. Dillard

IPC分类号： C07F15/04 ,  C07C126/08 ,  C07C127/01

CPC分类号： C07F15/04

摘要： A two-stage continuous crystallization process for production of urea phosphate by reaction of impure wet-process orthophosphoric acid (about 54 percent P.sub.2 O.sub.5) and urea with simultaneous addition of a selected acidifying agent (sulfuric acid, hydrochloric acid, or phosphoric acid) to clarified mother liquor used as recycle in the process. Addition of the acidifying agent decreases pH in the crystallization process whereby the solubility of a contaminating water-insoluble iron phosphate-urea salt [FeH.sub.3 (PO.sub.4).sub.2.2CO(NH.sub.2).sub.2 ] is increased, purity of the crystalline urea phosphate product is improved significantly, and the useful storage life of the recycle mother liquor is prolonged.

摘要翻译： 通过不纯的湿法正磷酸（约54％P 2 O 5）和尿素的反应生产尿素磷酸盐的两阶段连续结晶方法，同时加入选定的酸化剂（硫酸，盐酸或磷酸）澄清 在这个过程中用作回收的母液。 酸化剂的添加降低了结晶过程中的pH值，由此污染的水不溶性磷酸铁 - 尿素盐[FeH 3（PO 4）2.2 CO（NH 2）2]的溶解度增加，结晶尿素磷酸盐产品的纯度显着提高 ，延长了循环母液的有效保存期。

公开(公告)号：UST103206I4

公开(公告)日：1983-07-05

申请号：US324515

申请日：1981-11-24

申请人： Harry T. Lewis ,  Ewell F. Dillard

发明人： Harry T. Lewis ,  Ewell F. Dillard

摘要： A two-stage continuous crystallization process for production of urea phosphate by reaction of impure wet-process orthophosphoric acid (about 54 percent P.sub.2 O.sub.5) and urea with simultaneous addition of a selected acidifying agent (sulfuric acid, hydrochloric acid, or phosphoric acid) to clarified mother liquor used as recycle in the process. Addition of the acidifying agent decreases pH in the crystallization process whereby the solubility of a contaminating water-insoluble iron phosphate-urea salt [FeH.sub.3 (PO.sub.4).sub.2.2CO(NH.sub.2).sub.2 ] is increased, purity of the crystalline urea phosphate product is improved significantly, and the useful storage life of the recycle mother liquor is prolonged.