化工学报2019，Vol.70Issue(6)：2102-2109,8.DOI:10.11949/0438-1157.20181517
313.15 K四元体系Na+//SO2 -4 ,CO2 -3 ,NO-3-H2O固液相平衡研究
Solid-liquid equilibria of quaternary system Na+//SO2 -4 , CO2 -3 , NO-3-H2O at 313.15 K
摘要
Abstract
An experimental study on phase equilibria of the system Na+//SO2 -4 ,CO2 -3 ,NO-3-H2O at 313.15K was done by the method of isothermal solution saturation. The solubility and physical properties (ρ, η, nD) of the equilibrium quaternary system were measured, and the corresponding phase diagram, water diagram and physical property (ρ, η, nD) diagram were obtained based on the data measured. The results show that: the phase diagram of Na+//SO2 -4 ,CO2 -3 , NO-3-H2O at 313.15 K consists of two invariant points, six univariant curves, and five crystallization regions which are NaNO3, Na2SO4, Na2CO3·H2O, Bur(Na2CO3·2Na2SO4), and Da(NaNO3·Na2SO4·H2O), respectively. The Bur crystallization field occupies the largest part, which indicates it is easier to crystallize in the mixing solution. All the physical properties (ρ, η, nD) change regularly with J(Na2SO4) composition. Bur(Na2CO3·2Na2SO4), Da(NaNO3· Na2SO4·H2O) and crystalline hydrate (Na2CO3·H2O) are proven to co-exist in the quaternary system, whereas no solid solution is found in the temperature range investigated, which means the reciprocal quaternary system is a complex eutectic type. The data and conclusions obtained from the experiment are of great significance for the development of crystallization salt separation process of high salt wastewater produced by coal chemical process and the realization of comprehensive utilization of resources.关键词
硫酸钠/相平衡/四元体系/物理性质Key words
Na2SO4/phase equilibria/quaternary system/physical properties分类
数理科学引用本文复制引用
任永胜,曹晶,于冰洁..313.15 K四元体系Na+//SO2 -4 ,CO2 -3 ,NO-3-H2O固液相平衡研究[J].化工学报,2019,70(6):2102-2109,8.基金项目
国家重点研发计划项目(2017YFC0210601) （2017YFC0210601）
青年科学基金项目(51706070) （51706070）
