高校化学工程学报2017，Vol.31Issue(2)：276-283,8.DOI:10.3969/j.issn.1003-9015.2017.02.004
298.15 K下四元体系Na+,K+//SO42-,H2PO4--H2O固液相平衡研究
Solid-Liquid Equilibria of a Quaternary System Na+, K+//SO42-, H2PO4-- H2O at 298.15 K
摘要
Abstract
Solid-liquid equilibria of a reciprocal quaternary system (Na+, K+ // SO42-, H2PO4-- H2O) at 298.15K were studied with isothermal solution saturation method. Solubility and physical properties (nD, η, ρ) of the equilibrium quaternary system were measured, and corresponding phase diagram, water diagram and physical property (ρ, η, nD) diagram were produced based on the data measured. The experimental results show that the phase diagram at 298.15 K contains four invariant points, nine univariant curves and six single salt crystallization fields which are K2SO4, Gla (3K2SO4·Na2SO4), Na2SO4·10H2O, KH2PO4, Na2SO4,NaH2PO4·2H2O, respectively. The Gla crystallization field occupies the largest part, which indicates it is easier to crystallize in the mixing solution. Gla (3K2SO4·Na2SO4) and crystalline hydrate (Na2SO4·10H2O,NaH2PO4·2H2O) are proven to co-exist in the quaternary system, whereas no solid solution is found at the investigated temperature, which means the reciprocal quaternary system is a complex eutectic type. Physical properties (nD, η, ρ) change regularly with the change of J(SO42-) composition in the saturated solution.关键词
磷酸二氢钾/相平衡/四元体系/物理性质Key words
KH2PO4/phase equilibria/quaternary system/physical properties分类
化学化工引用本文复制引用
沈薇,谢娟,何婷婷,任永胜..298.15 K下四元体系Na+,K+//SO42-,H2PO4--H2O固液相平衡研究[J].高校化学工程学报,2017,31(2):276-283,8.基金项目
中国科学院"西部之光"人才培养计划项目(2013年) （2013年）
宁夏大学研究生创新项目(15HGG25). （15HGG25）
