文献类型：期刊文献

中文题名：343.15 K下NaCl-NaNO_(3)-Na_(2)SO_(4)-H_(2)O四元体系相平衡研究

英文题名：Phase equilibrium of NaCl-NaNO_(3)-Na_(2)SO_(4)-H_(2)O quaternary system at 343.15 K

作者：陈鑫[1];陈杭[2];边超[2];宋兴福[2]

机构：[1]中石化宁波工程有限公司,浙江宁波315048;[2]华东理工大学国家盐湖资源综合利用工程技术研究中心,上海200237

年份：2025

卷号：45

期号：2

起止页码：234

中文期刊名：化工环保

外文期刊名：Environmental Protection of Chemical Industry

收录：;北大核心:【北大核心2023】；

语种：中文

中文关键词：高盐废水;分质结晶;相平衡;氯化钠;硫酸钠;硝酸钠

外文关键词：high-salinity wastewater;fractal crystallization;phase equilibrium;sodium chloride;sodium sulphate;sodium nitrate

摘要：采用等温溶解平衡法测定了343.15 K时NaCl-NaNO_(3)-H_(2)O、NaCl-Na_(2)SO_(4)-H_(2)O、NaNO_(3)-Na_(2)SO_(4)-H_(2)O 3种三元体系和NaCl-NaNO_(3)-Na_(2)SO_(4)-H_(2)O四元体系的相平衡数据。实验结果表明:NaCl-NaNO_(3)-H_(2)O、NaCl-Na_(2)SO_(4)-H_(2)O三元体系属于简单共饱和型体系,无复盐和共溶体产生;NaNO_(3)-Na_(2)SO_(4)-H_(2)O三元体系存在NaNO_(3)·Na_(2)SO_(4)·H_(2)O复盐结晶区,但复盐结晶区较小;NaCl-NaNO_(3)-Na_(2)SO_(4)-H_(2)O四元体系包含Na_(2)SO_(4)结晶区、NaCl结晶区、NaNO_(3)结晶区和NaNO_(3)·Na_(2)SO_(4)·H_(2)O复盐结晶区,NaCl和NaNO_(3)对Na_(2)SO_(4)存在强盐析作用,Na_(2)SO_(4)结晶区面积远大于其他结晶区;为降低复盐结晶区对分质结晶工艺的影响,相应结晶操作温度应高于343.15 K。
The phase equilibrium data of three ternary systems(NaCl-NaNO_(3)-H_(2)O,NaCl-Na_(2)SO_(4)-H_(2)O,and NaNO_(3)-Na_(2)SO_(4)-H_(2)O)and the quaternary system(NaCl-NaNO_(3)-Na_(2)SO_(4)-H_(2)O)at 343.15 K were determined by the isothermal dissolution equilibrium method.The results indicate that the NaCl-NaNO_(3)-H_(2)O and NaCl-Na_(2)SO_(4)-H_(2)O ternary systems are simple co-saturated systems,with no double salts or co-solutes formed,while the NaNO_(3)-Na_(2)SO_(4)-H_(2)O system has a small crystallization region of the double salt NaNO_(3)·Na_(2)SO_(4)·H_(2)O.The quaternary system NaCl-NaNO_(3)-Na_(2)SO_(4)-H_(2)O consists of the Na_(2)SO_(4) crystallization region,NaCl crystallization region,NaNO_(3) crystallization region,and double salt NaNO_(3)·Na_(2)SO_(4)·H_(2)O crystallization region.NaCl and NaNO_(3) have a strong salting-out effect on Na_(2)SO_(4),and the area of the Na_(2)SO_(4) crystallization regions is significantly larger than that of other crystallization regions.In order to reduce the influence of the double salt crystallization region on the fractal crystallization process,the corresponding crystallization operating temperature should be higher than 343.15 K.