公开(公告)号：US4368179A

公开(公告)日：1983-01-11

申请号：US209845

申请日：1980-11-24

申请人： Gunther Shimmel ,  Gero Heymer ,  Hasso Scott

发明人： Gunther Shimmel ,  Gero Heymer ,  Hasso Scott

IPC分类号： C01B25/30 ,  C01B25/41 ,  C01B25/42 ,  C01B15/16 ,  C01B25/26

CPC分类号： C01B25/30 ,  C01B25/41 ,  C01B25/425

摘要： The present invention relates to a process for the oxidation of alkali metal phosphites to alkali metal phosphates at temperatures of between 400.degree. and 500.degree. C. To this end, alkali metal phosphites are employed in the form of an aqueous solution or suspension and, if necessary, the alkali metal : P atomic ratio in this feed material is adjusted to a ratio which at least corresponds to the atomic ratio desired for the final product.More particularly, the solution or suspension is spray-dried in a tower, in a single operational stage, by spraying in a flame zone. Starting material free from alkali metal phosphate and with an alkali metal : P atomic ratio equal to or greater than 3.5 is used for making a trialkali metal phosphate which is obtained in admixture with an alkali metal hydroxide. Starting material which contains from 25 to 45% by weight of alkali metal phosphate, calculated as phosphorus, based on their total phosphorus content, is employed for making alkali metal polyphosphates.

摘要翻译： 本发明涉及在400〜500℃的温度下将碱金属亚磷酸盐氧化为碱金属磷酸盐的方法。为此，碱金属亚磷酸盐以水溶液或悬浮液的形式使用，如果 必要时，将该原料中的碱金属：P原子比调节至至少对应于最终产物所需的原子比的比例。 更具体地说，溶液或悬浮液在塔中在单个操作阶段通过在火焰区域中喷雾进行喷雾干燥。 使用不含碱金属磷酸盐和碱金属的原料：P原子比等于或大于3.5，用于制备与碱金属氢氧化物混合得到的三碱金属磷酸盐。 使用含有25〜45重量％碱金属磷酸盐的起始原料，以磷总计计为磷，用于制造碱金属多磷酸盐。