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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。