文献类型：期刊文献

英文题名：Stable Solid Liquid Equilibrium of the Quaternary System Na+//Cl-, NO3-, and SO42--H2O at 333.15 K

作者：Chen, Hang[1,3];Bian, Chao[1];Bian, Jiawen[1];Song, Xingfu[1,2,3];Yu, Jianguo[1,2]

机构：[1]East China Univ Sci & Technol, Minist Educ, Engn Res Ctr Resource Salt Lake Proc Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, State Environm Protect Key Lab Environm Risk Asse, Shanghai 200237, Peoples R China;[3]Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China

年份：2019

卷号：64

期号：8

起止页码：3569

外文期刊名：JOURNAL OF CHEMICAL AND ENGINEERING DATA

收录：;EI(收录号：20193507360771);WOS:【SCI-EXPANDED(收录号:WOS:000480501100037)】；

基金：The authors acknowledge the financial supports sponsored by Shanghai Sailing Program (grant no. 17YF1403200), Shanghai Academic/Technology Research Leader (grant no. 18XD1424600), and the Fundamental Research Funds for the Central Universities (grant no. WB1717008).

语种：英文

外文关键词：Chemical industry - Sodium chloride - Phase equilibria - Sodium sulfate

摘要：The stable-phase equilibrium of the quaternary system Na+//Cl-, NO3-, and SO42--H2O and its ternary subsystems at 333.15 K was measured by the isothermal dissolution method. Different from the simple phase equilibrium of the systems at 353.15 K, there is double salt generated in the Na+//NO3- and SO42--H2O system at 333.15 K. The double salt was determined to be NaNO3 center dot Na2SO4 center dot H2O by combining the wet residual analysis and X-ray diffraction test. Based on this characteristic, the quaternary Na+//Cl-, NO3-, and SO42--H2O system has two invariant points and five univariant curves, which generate four fields corresponding to the crystallization of Na2SO4, NaCl, NaNO3 and the double salt. The areas of the fields indicate that the single salts have the solubilities in the sequence of Na2SO4 < NaCI < NaNO3. Meanwhile, the crystallization region of the double salt is relatively small, which indicates that the double salt will disappear when increasing the temperature further. Related results provide the important basis for the fractional crystallization process