摘要
用等温溶解平衡法研究了NaCl-NaBr-H2O三组分物系在相平衡温度为313,333K时的相平衡关系,测定了平衡液相的密度和折光率等物化参数。实验结果表明,该三组分物系313K时的固液平衡等温曲线由一个零变量点(E)、两条单变量曲线和两个固相区(Na(Cl,Br).2H2O和Na(Cl,Br))构成,E点对应的液相组成为wLiq(NaCl)=4.91%,wLiq(NaBr)=42.99%;相对应的固相组成为Na(Cl,Br).2H2O+Na(Cl,Br)。333K的溶解度等温图由一条单变量曲线和一个固相区构成。该物系属于固体溶液型。用Pitzer半经验统计力学模型校验了测得的该物系313,333K时的溶解度。
Phase equilibrium of NaCl- NaBr- H2O ternary system was investigated at 313 and 333 K by isothermal method. Physicochemical properties of solutions, namely density and refractive index, were determined. Phase diagram of the ternary system at 313 K includes one invariant point E, two univariant curves and two crystallization regions -Na（Cl,Br） · 2H2O and Na（Cl,Br）. Liquid phase corresponding to E consists of WLiq （NaCl） 4.91% and WLiq （NaBr） 42.99%, and corresponding solid phase contains Na（Cl,Br） · 2H2O and Na（Cl,Br）. Phase diagram of the ternary system at 333 K includes one univariant curve and one crystallization region Na（ Cl, Br）. The ternary system is of solid solution type. The determined solubilities were checked by using Pitzer semiempirical statistical mechanical model of electrolyte solution. The calculated values are basically in agreement with experiment data.
出处
《石油化工》
EI
CAS
CSCD
北大核心
2007年第4期358-361,共4页
Petrochemical Technology
关键词
氯化钠
溴化钠
相平衡
固溶体
PITZER模型
sodium chloride
sodium bromide
phase equilibrium
solid solution
Pitzer model
