无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2022, Vol. 54 ›› Issue (10): 42-46.doi: 10.19964/j.issn.1006-4990.2021-0782

• 盐湖资源开发与利用 • 上一篇    下一篇

四元体系NaCl+NaBO2+Na2CO3+H2O 298.15 K 相平衡研究

马玉军(),王晓(),李淑雅,张付康,李娟   

  1. 青海大学化工学院,青海 西宁 810016
  • 收稿日期:2021-12-29 出版日期:2022-10-10 发布日期:2022-11-03
  • 作者简介:马玉军(1992— ),男,硕士,研究方向为盐湖资源利用;E-mail:510386333@qq.com
  • 基金资助:
    青海省科技厅项目(2019-2J-7043)

Phase equilibria of quaternary system of NaCl+NaBO2+Na2CO3+H2O at 298.15 K

MA Yujun(),WANG Xiao(),LI Shuya,ZHANG Fukang,LI Juan   

  1. School of Chemical Engineering,Qinghai University,Xining 810016,China
  • Received:2021-12-29 Published:2022-10-10 Online:2022-11-03

摘要:

柴达木盐湖中具有丰富的盐湖离子,对其中的一个四元体系水盐相图开展研究,采用等温溶解平衡法开展了298.15 K时四元体系NaCl+NaBO2+Na2CO3+H2O相平衡研究,测定了体系平衡液相组成及密度和折光率,绘制了四元体系NaCl+NaBO2+Na2CO3+H2O 298.15 K的相图及相应的物化性质图。研究发现NaCl+NaBO2+Na2CO3+H2O四元体系298.15 K 时包含2个共饱点(E1E2)、5条溶解度曲线(AE1BE1CE2DE2E1E2)、4个结晶区(NaCl、NaBO2·4H2O、Na2CO3·7H2O、NaCl·NaBO2·2H2O)。其中三元体系NaCl+NaBO2+H2O在298.15 K下产生了复盐NaCl·NaBO2·2H2O,通过研究发现该四元体系NaCl+NaBO2+Na2CO3+H2O在298.15 K下也具有NaCl·NaBO2·2H2O复盐区。

关键词: 相平衡, 四元体系, 溶解度, 盐湖

Abstract:

There were abundant ions in the salt lake of Qaidam,and the water salt phase diagram of a quaternary system was studied.The phase equilibrium of NaCl+NaBO2+Na2CO3+H2O at 298.15 K was studied by isothermal solution equilibrium method,the composition,density and refractive index of the equilibrium liquid phase of the system were measured.The phase diagram of the quaternary system of NaCl+NaBO2+Na2CO3+H2O 298.15 K and its corresponding physico-chemical properties were drawn.It was found that the system of NaCl+NaBO2+Na2CO3+H2O at 298.15 K contained two saturation points (E1,E2),five solubility curves(AE1,BE1,CE2,DE2,E1E2),four crystallization regions(NaCl,NaBO2·4H2O,Na2CO3·7H2O,NaCl·NaBO2·2H2O).In the ternary system NaCl+NaBO2+H2O,double salt NaCl·NaBO2·2H2O was produced at 298.15 K.The study showed that the quaternion system of NaCl+NaBO2+Na2CO3+H2O also had NaCl·NaBO2·2H2O double salt region at 298.15 K.

Key words: phase equilibrium, quaternary system, solubility, salt lake

中图分类号: