摘要
本文对“中间盐”复分解制碱法进行了研究。“中间盐”的加入不能使两个三盐共饱和点在干盐图上发生明显的移动,但能使三盐介稳平衡点的介稳期延长,从而使得用碳酸氢铵和食盐通过复分解制碱成为可能。
The raw material NH_4HCO_3 and NaCl in the production of sodium carbonate accordingto the double decompositionNH_4HCO_3+ NaCl-NaHCO_3 + NH_4Cl (2)are plentiful in China. The main difficulty of the process technologically is the separatingNH_4Cl from the mother solotion I. In this paper the method of adding a middle salt,NH_4 NO_3 or (NH_4)_2SO_4, has been studied. The middle salts can not change the place of thesaturated pointes of the reciprocal system in the dry-salt diagram evidently,but can prolongthe waiting time for crystallization of NaHCO_3 in the mother solution Ⅱ. The effect ofNH_4NO_3 is much better than that of (NH_4)_2SO_4·In adding NH_4NO_3, the waiting time isprolonged enough to separate tbe crystalline of NH_4Cl and the process of the fomula (2)become practicable.
出处
《应用化学》
CAS
CSCD
北大核心
1989年第3期26-30,共5页
Chinese Journal of Applied Chemistry
关键词
碳酸氢铵
纯碱
中间盐
复分解
Sodium carbonate
Middle salt
Ammonium bicarbonate
Double decomposition
