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    • 6. 发明授权
    • Process for the preparation of phosphorous acid
    • 制备磷酸的方法
    • US5147625A
    • 1992-09-15
    • US739873
    • 1991-08-02
    • Alexander TapperHorst BuhlJosef Holz
    • Alexander TapperHorst BuhlJosef Holz
    • C01B7/03C01B25/163
    • C01B7/035C01B25/163
    • In a continuous process for the preparation of phosphorous acid with simultaneous production of hydrochloric acid, a reaction zone is provided which is in open communication with a first scrubbing zone. A portion of the reaction product is recycled from the bottom of the reaction zone into the top of the scrubbing zone and phosphorous acid is removed from the circulation. Hydrogen chloride gas escaping from the top of the first scrubbing zone is brought into contact, in a cooled, second scrubbing zone, with an overstoichiometric amount of water. Hydrochloric acid is obtained which is passed as starting material into the reaction zone or into the top of the first scrubbing zone. The external cooling of the second scrubbing zone is controlled such that the temperature in the reaction zone is kept constant at a desired value between 90.degree. and 130.degree. C. without adding any external cooling or heating energy. Pure hydrochloric acid is recovered in an absorption zone.
    • 在以同时生产盐酸制备亚磷酸的连续方法中,提供了与第一洗涤区开放连通的反应区。 反应产物的一部分从反应区的底部再循环到洗涤区的顶部,并且从循环中除去亚磷酸。 从第一洗涤区的顶部排出的氯化氢气体在冷却的第二洗涤区中与化学计量的水接触。 得到的盐酸作为原料进入反应区或进入第一洗涤区的顶部。 控制第二洗涤区的外部冷却,使得反应区中的温度保持恒定在90℃至130℃之间的期望值,而不增加任何外部冷却或加热能量。 在吸收区中回收纯盐酸。
    • 9. 发明授权
    • Process for making calciummonohydrogen phosphate dihydrate
    • 磷酸二氢钙二水合物的制备方法
    • US4483837A
    • 1984-11-20
    • US507784
    • 1983-06-24
    • Josef CremerJosef HolzHans HaasFriedrich Schulte
    • Josef CremerJosef HolzHans HaasFriedrich Schulte
    • C01B25/32C01B15/16C01B25/26
    • C01B25/322
    • The disclosure relates to a process for making calciummonohydrogen phosphate dihydrate with a high degree of whiteness from pure phosphoric acid and naturally occurring calcium carbonates. More particularly, a fine-particulate calcium carbonate is suspended in water and the suspension is mixed at temperatures between 0.degree. and 60.degree. C. with phosphoric acid so as to establish a Ca/P-ratio of 0.20 up to 0.57. The phosphoric acid is added in quantities per unit time preventing the resulting mixture from foaming over. Next, solid matter constituents are separated from the mixture, after CO.sub.2 has ceased to evolve, with the resultant formation of a clear colorless acid solution. This solution and an aqueous suspension or solution of pure alkali metal and/or alkaline earth metal carbonates and/or hydroxides, are jointly introduced into a reaction zone at a reaction temperature of 20.degree. to 45.degree. C. so as to establish a pH-value initially of 2.0 to 5.0 and then, towards the end of the reaction of 6.0 to 8.0. Finally, the reaction product is filtered off, washed out, and dried in known fashion.
    • 本公开涉及一种从纯磷酸和天然存在的碳酸钙制备具有高白度的磷酸氢钙二水合物的方法。 更具体地,将细颗粒碳酸钙悬浮在水中,并将悬浮液在0℃至60℃的温度下与磷酸混合,以便确定0.20至0.57的Ca / P比。 每单位时间内加入磷酸,防止所得混合物发泡。 接下来,在CO 2停止放出之后,固体成分与混合物分离,形成澄清的无色酸溶液。 将该溶液和纯碱金属和/或碱土金属碳酸盐和/或氢氧化物的水性悬浮液或溶液在20〜45℃的反应温度下共同引入反应区,以建立pH- 值最初为2.0〜5.0,然后在6.0〜8.0的反应结束。 最后,将反应产物滤出,洗涤并以已知方式干燥。