298K下Na^+,K^+//Cl~ˉ,SO_4^(2ˉ),NO_3~ˉ-H_2O五元体系液固介稳相平衡  

Liquid–Solid Metastable Equilibria of a Quinary System Na^+, K^+//Cl~ˉ, SO_4^(2ˉ), NO_3~ˉ-H_2O at 298 K

作　　者：周婷[1] 王雪枫[1] 黄雪莉[1] 李惠[1] 刘娜[1] 

机构地区：[1]新疆大学化学化工学院,石油天然气精细化工教育部&自治区重点实验室,新疆乌鲁木齐830046

出　　处：《高校化学工程学报》2015年第3期510-515,共6页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基(20866008,21166022)

摘　　要：研究了298 K下,五元体系Na+,K+//Clˉ,SO42ˉ,NO3ˉ-H2O的液固介稳相平衡。采用等温蒸发法确定了溶液的介稳平衡溶解度。根据实验数据,绘制出了该体系介稳相图中氯化钠介稳饱和区以及氯化钠饱和条件下的介稳相平衡投影相图。相图中,有四个四盐共饱的零变量点、九个三盐共饱的单变量线和六个两盐结晶区:Na2SO4·Na NO3·H2O+Na Cl,3K2SO4·Na2SO4+Na Cl,Na NO3+Na Cl,KNO3+Na Cl,Na2SO4+Na Cl和KCl+Na Cl。该体系在298 K下的介稳相图和稳定平衡相图存在一定的差别,复盐3K2SO4·Na2SO4的结晶区明显缩小。An experimental study on metastable equilibria of a quinary system Na^＋, K^＋//Cl. SO4^2-, NO3^--H2O at 298 K was performed using an isothermal evaporation method. Metastable equilibrium solubilities were determined experimentally, and the metastable equilibrium phase diagram under the condition saturated with NaCl was plotted. The results show that there are four invariant points, nine univariant curves and six regions of crystallization： Na2SO4·NaNO3·H2O ＋ NaCl, NaNO3 ＋ NaCl, 3K2SO4·Na2SO4 ＋ NaCl, KNO3 ＋ NaCl, Na2SO4 ＋ NaCl and KCl ＋ NaCl. Some differences were found between the metastable diagram and the stable phase diagram at 298 K, and the crystallization regions of 3K2SO4·Na2SO4 become smaller.

关 键 词：五元体系 介稳相平衡 硝酸盐 溶解度 

分 类 号：O642.42[理学—物理化学]