发明授权
- 专利标题： Ammonium pyrophosphates, processes for preparing, and uses
- 专利标题（中）： 氨基磷酸盐，制备方法和用途
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申请号： US3645675D申请日： 1969-12-19
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公开(公告)号： US3645675A公开(公告)日： 1972-02-29
- 发明人: SEARS PAUL G , VANDERSALL HOWARD L
- 申请人： MONSANTO CO
- 专利权人： Monsanto Co
- 当前专利权人： Monsanto Co
- 优先权： US88677569 1969-12-19
- 主分类号： C01B25/28
- IPC分类号： C01B25/28 ; C01B25/40 ; C05B13/06
摘要：
Ammonium pyrophosphates of the formula (NH4)2 7H1 3P2O7 and (NH4)3 3H 7P2O7 are useful as intermediates in the preparation of polymeric water insoluble ammonium polyphosphates and as final products in detergent and fertilizer applications. The new ammonium pyrophosphates are prepared by condensing orthophosphoric acid with a combined ammoniating and condensing agent, e.g., urea, in a molar ratio of nitrogen to phosphorus of 1.4 to 1.75 or 2.5 to 4.0.
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