K_2CO_3-Na_2CO_3-H_2O三元体系273K相平衡实验研究  

Experimental Study on the Phase Equilibrium of the Ternary System K_2CO_3-Na_2CO_3-H_2O at 273k

作　　者：郑志远[1] 曾英[1] 林晓峰[1] 

机构地区：[1]成都理工大学材料与化学化工学院,四川成都610059

出　　处：《盐业与化工》2007年第1期7-9,共3页Jounral of Salt and Chemical Industry

基　　金：国家自然科学基金资助项目(40303010#)

摘　　要：采用等温蒸发法研究了三元体系K2CO3-Na2CO3-H2O 273K时的相平衡及平衡液相的密度。利用溶解度数据绘制了该三元体系273K下的相图。研究发现:该三元体系有异成分复盐K2CO3.Na2CO3.12H2O形成;相图中有两个共饱点、三条单变量曲线和三个结晶相区。三个结晶相区分别为盐K2CO3.10H2O、K2CO3.3/2H2O和K2CO3.Na2CO3.12H2O的结晶区。实验结果表明,K2CO3对Na2CO3有强烈的盐析作用。The solubilities and densities of equilibrium solutions were studied in the ternary system K2CO3-Na2CO3-H2O at 273K with isothermal evaporation method. Based on the solubility data,the phase diagram of the system was plotted. The phase diagram consists of two invariant point, three univariant curves and three crystallization fields, which correspond to the salt K2CO3·10H2O,Na2CO3·3/2H2O and K2CO3·Na2CO3·12H2O. In the system,the double salt （K2CO3·Na2CO3·12H2O）was formed. K2CO3 has strong salt-out effect to Na2CO3 in the solution.

关 键 词：水盐体系 相平衡 碳酸盐 

分 类 号：TQ127.1[化学工程—无机化工]