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    • 9. 发明授权
    • Purification of caustic soda
    • 苛性钠的净化
    • US6113657A
    • 2000-09-05
    • US41691
    • 1998-03-13
    • Dieter SchlaferMichael MaussMatthias RaulsDieter Baumann
    • Dieter SchlaferMichael MaussMatthias RaulsDieter Baumann
    • C01D1/30
    • C01D1/30
    • In a process for preparing crystalline NaOH.3.5H.sub.2 O, NaOH.3.5H.sub.2 O is allowed to crystallize from an aqueous sodium hydroxide solution which contains sodium chloride and is saturated in respect of NaOH.3.5H.sub.2 O and the crystals formed are separated from the solution using a mechanical solid/liquid separation apparatus, wherein the solid/liquid separation is carried out under conditions under which the crystalline NaOH.3.5H.sub.2 O is freed sufficiently of residual solution adhering to the surface for the sodium chloride content of the crystalline NaOH.3.5H.sub.2 O obtained to be less than 100 mg per kg. The crystalline NaOH.3.5H.sub.2 O is subjected to an additional purification step, which may include the at least superficial melting or the at least superficial dissolution of the crystals, in combination with a solid/liquid separation step. The additional purification step. The additional purification step comprises washing the crystalline NaOH.3.5H.sub.2 O separated off.
    • 在制备结晶NaOH.3.5H2O的方法中,使NaOH.3.5H2O从含有氯化钠的氢氧化钠水溶液中结晶,并且在NaOH.3.5H 2 O下饱和,并将形成的晶体与溶液分离,使用 机械固/液分离装置,其中固/液分离在结晶NaOH.3.5H2O充分释放残留溶液附着在表面上的条件下进行,得到的结晶NaOH.3.5H2O的氯化钠含量为 小于100mg / kg。 结晶NaOH.3.5H2O经受另外的纯化步骤,其可以包括与固/液分离步骤组合的晶体的至少表面熔融或至少表面溶解。 额外的净化步骤。 另外的纯化步骤包括洗涤析出的结晶NaOH.3.5H2O。