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    • 3. 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。
    • 7. 发明授权
    • Process for the preparation of dicalcium phosphate
    • 磷酸二钙的制备方法
    • US5024825A
    • 1991-06-18
    • US521737
    • 1990-05-10
    • Horst BuhlJosef HolzFranz-Josef Dany
    • Horst BuhlJosef HolzFranz-Josef Dany
    • C01B25/32
    • C01B25/322
    • For the preparation of dicalcium phosphate dihydrate stabilized with dimagnesium phosphate trihydrate and sodium pyrophosphate, an aqueous suspension of calcium carbonate is introduced into a reactor and recirculated by pumping through a high-speed mixer at 3,500 to 8,000 rpm which is in flow connection with the lower and upper portion of the reactor. Into the mixer an amount of phosphoric acid is introduced which is at least sufficient for the quantitative formation of dicalcium phosphate dihydrate and then an oxygen-containing magnesium compound is introduced into the reactor. Finally, lime milk is metered into the reactor up to a maximum pH of 6.9, before the sodium pyrophosphate is added to the reactor. The resulting suspension which has a stabilized dicalcium phosphate dihydrate content of 20 to 33% by weight is spray-dried.An apparatus for carrying out the process comprises besides a stirred reactor 1 two stirrer-equipped slurry containers (6, 7) and an intermediate container 16 from which a line 17 leads into a spray tower 18 where it ends above an atomizer wheel 19. The spray tower 18 is also the end point for hot air lines 20 and is in flow connection with a filter 22. The bottom of filter 22 is the starting point for a product line 24 via which highly adsorbent dicalcium phosphate dihydrate can be withdrawn.
    • 为了制备用磷酸三氢镁和焦磷酸钠稳定的磷酸二钙二水合物,将碳酸钙的水性悬浮液引入反应器中,并通过泵送通过高速混合器以3,500至8,000rpm再循环,该高速混合器与下部流动相连 和反应器的上部。 向混合器中加入一定量的磷酸,其至少足以定量形成磷酸二钙二水合物,然后将含氧的镁化合物引入反应器中。 最后,在将焦磷酸钠加入到反应器中之前,将石灰乳计量加入反应器直至最高pH为6.9。 所得到的具有稳定的磷酸二钙二水合物含量为20至33重量%的悬浮液被喷雾干燥。 用于进行该方法的装置除了具有搅拌反应器1的两个装有搅拌器的浆料容器(6,7)和中间容器16之外,其中管线17从该搅拌反应器引入喷雾塔18,在该喷雾塔18中它结束在雾化器轮19的上方。 喷雾塔18也是热空气管线20的终点,并且与过滤器22流动连接。过滤器22的底部是产物线24的起始点,通过该产物线24可以抽出高吸附性磷酸二钙二水合物。