K_2CO_3-Na_2CO_3-H_2O三元体系288K相平衡研究  

Experimental study on the phase equilibrium of the ternary system K_2CO_3-Na_2CO_3-H_2O at 288 K

作　　者：桑世华[1] 殷辉安[1] 唐明林[1] 

机构地区：[1]成都理工大学材料与生物工程学院,四川成都610059

出　　处：《无机盐工业》2003年第1期23-24,55,共3页Inorganic Chemicals Industry

基　　金：国家自然科学基金 (4 9773 2 0 0 )

摘　　要：采用等温溶解平衡法研究了三元体系K2 CO3 -Na2 CO3 -H2 O 2 88K时的相平衡及平衡液相的主要物化性质 (密度 ,电导率 ,pH)。研究发现 :该三元体系有复盐NaKCO3 ·6H2 O形成 ,根据溶解度数据绘制了相图 ,相图中有 2个共饱点E、F ,三条单变度曲线AE、BF、EF ;平衡固相分别为K2 CO3 ·3/ 2H2 O、Na2 CO3 ·10H2 O、NaKCO3 ·6H2 O。实验结果表明K2 CO3 对Na2 CO3 有强烈的盐析作用 ;并简要讨论了实验结果。The solubilities and properties(density,electrical conductivity and pH)of solution were studied in the ternary system K 2CO 3-Na 2CO 3-H 2O at 288 K by isothermal equilibrium method.Based on the solubility data,the phase diagram of the system was plotted,which consists of two invariant point E and F;three univariant curves AE,BF,EF,three crystallization zone;K 2CO 3·3/2H 2O,Na 2CO 3·10H 2O,NaKCO 3·6H 2O.The K 2CO 3 have strong salt-out effect to Na 2CO 3 in the solution.The experimental results were discussed simplely.

关 键 词：K2CO3-Na2CO3-H2O 三元体系 相平衡 研究 水盐体系 碳酸盐 

分 类 号：TQ127.13[化学工程—无机化工]