公开(公告)号：US4610862A

公开(公告)日：1986-09-09

申请号：US710415

申请日：1985-03-11

申请人： Taizo Kajitani ,  Shigeo Fujii ,  Tadao Sato ,  Ikuo Yonehara ,  Chikashi Fukumura ,  Kenji Harita

发明人： Taizo Kajitani ,  Shigeo Fujii ,  Tadao Sato ,  Ikuo Yonehara ,  Chikashi Fukumura ,  Kenji Harita

IPC分类号： C01B25/28

CPC分类号： C01B25/28

摘要： A process for producing purified diammonium phosphate (abbreviated to DAP) directly from wet process phosphoric acid with a high yield is provided, which process comprises reacting wet process phosphoric acid with NH.sub.3 at 50.degree..about.80.degree. C. while keeping the molar ratio of NH.sub.3 /H.sub.3 PO.sub.4 at 1.65-1.90; separating the resulting slurry containing DAP crystals and an insoluble sludge into a slurry containing the former and a slurry containing the latter; treating the former slurry in a conventional manner to recover DAP; while treating the latter slurry by heating it to 60.degree..about.95.degree. C. to dissolve DAP contained therein, removing the sludge by centrifugal separation and concentrating the filtrate to recover DAP; and combining the two portions of DAP.

摘要翻译： 提供了一种从湿法磷酸直接生产纯度高的磷酸二铵（缩写为DAP）的方法，该方法包括使湿法磷酸与NH3在50℃下反应80℃，同时保持NH 3 / H 3 PO 4，1.65-1.90; 将含有DAP晶体和不溶性污泥的所得浆料分离成含有前者的浆料和含有后者的浆料; 以常规方式处理前浆料以回收DAP; 同时通过将其加热至60℃至60℃，以溶解其中所含的DAP来处理后者浆料，通过离心分离除去污泥并浓缩滤液以回收DAP; 并结合DAP的两部分。

公开(公告)号：US4610853A

公开(公告)日：1986-09-09

申请号：US709923

申请日：1985-03-08

申请人： Taizo Kajitani ,  Shigeo Fujii ,  Tadao Sato ,  Ikuo Yonehara ,  Chikashi Fukumura ,  Kenji Harita

发明人： Taizo Kajitani ,  Shigeo Fujii ,  Tadao Sato ,  Ikuo Yonehara ,  Chikashi Fukumura ,  Kenji Harita

IPC分类号： C01B25/28

CPC分类号： C01B25/28

摘要： A process for producing purified monoammonium phosphate (abbreviated to MAP) directly from wet process phosphoric acid with a high yield is provided, which process comprises reacting wet process phosphoric acid with NH.sub.3 at 50.degree..about.80.degree. C. while keeping the molar ratio of NH.sub.3 /H.sub.3 PO.sub.4 at 0.9.about.1.35; separating the resulting slurry containing MAP crystals and an insoluble sludge into a slurry containing the former and a slurry containing the latter; treating the former slurry in a conventional manner to recover MAP; while treating the latter slurry by heating it to 60.degree..about.95.degree. C. to dissolve MAP contained therein, removing the sludge by centrifugal separation and concentrating the filtrate to recover MAP; and combining the two portions of MAP.

摘要翻译： 提供了一种以高产率从湿法磷酸直接生产纯化磷酸二氢铵（简称MAP）的方法，该方法包括使湿法磷酸与NH3在50℃下反应80℃，同时保持NH 3的摩尔比 / H3PO4在0.9差异1.35; 将含有MAP晶体和不溶性污泥的所得浆料分离成含有前者的浆料和含有后者的浆料; 以常规方式处理前浆料以回收MAP; 同时通过将其加热至60℃，将其加热至60℃，以溶解其中所含的MAP，通过离心分离除去污泥并浓缩滤液以回收MAP; 并组合MAP的两部分。