硫酸钠制备碳酸氢钠过程中Na_(2)SO_(4)-NH_(3)-CO_(2)-H_(2)O体系相平衡规律  

Phase equilibrium of Na_(2)SO_(4)-NH_(3)-CO_(2)-H_(2)O system in preparation of sodium bicarbonate from sodium sulfate

作　　者：胡洪远 张洋[2] 张贺东 范兵强 郑诗礼[2] 汤吉海[1] HU Hongyuan;ZHANG Yang;ZHANG Hedong;FAN Bingqiang;ZHENG Shili;TANG Jihai(College of Chemical Engineering,Nanjing Tech University,Nanjing 211816,Jiangsu,China;Key Laboratory of Green Process and Engineering,National Engineering Research Center of Green Recycling for Strategic Metal Resources,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China;Zhengzhou Institute of Emerging Industrial Technology,Zhengzhou 450000,Henan,China)

机构地区：[1]南京工业大学化工学院,江苏南京211816 [2]中国科学院过程工程研究所绿色过程与工程重点实验室,战略金属资源绿色循环利用国家工程研究中心,北京100190 [3]郑州中科新兴产业技术研究院,河南郑州450000

出　　处：《化工进展》2024年第3期1621-1629,共9页Chemical Industry and Engineering Progress

基　　金：国家重点研发计划(2022YFC3901303)。

摘　　要：Na_(2)SO_(4)-NH_(3)-CO_(2)-H_(2)O体系相平衡规律的掌握,对硫酸钠高值利用制备碳酸氢钠过程的工艺优化有重要意义。本文采用等温溶解平衡法在101.3~1099.0kPa下303.15K、323.15K和343.15K时研究了Na_(2)SO_(4)-NH_(3)-CO_(2)-H_(2)O体系以及其子体系Na_(2)SO_(4)-NH_(3)-H_(2)O的液-固相平衡关系,并获得了Na_(2)SO_(4)-NH_(3)-H_(2)O体系以及SO_(4)^(2-)、CO_(3)^(2-)和HCO_(3)^(-)在Na_(2)SO_(4)-NH_(3)-CO_(2)-H_(2)O体系相平衡规律。研究结果表明,Na_(2)SO_(4)-NH_(3)-H_(2)O体系中氨对硫酸钠有强烈盐析作用,当温度低于305.55K时在氨的作用下,体系平衡固相以无水硫酸钠的形式存在。同时硫酸钠氨盐水溶液通入二氧化碳进行碳酸化可促进硫酸钠的溶解。低温、高压有利于促进硫酸钠氨盐水溶液的碳酸化,并提高硫酸钠向碳酸氢钠的转化率。It is of great significance to master the phase equilibrium law of Na_(2)SO_(4)-NH_(3)-CO_(2)-H_(2)O system to optimize the process of preparing sodium bicarbonate with high utilization of sodium sulfate.In this paper,the liquid-solid equilibrium relationship of Na_(2)SO_(4)-NH_(3)-CO_(2)-H_(2)O system and its sub-system Na_(2)SO_(4)-NH_(3)-H_(2)O was studied by isothermal solution equilibrium method at 303.15K,323.15K and 343.15K at 101.3—1099.0kPa.The equilibrium law of SO_(4)^(2-),CO_(3)^(2-) and HCO_(3)^(-) in the Na_(2)SO_(4)-NH_(3)-CO_(2)-H_(2)O system and the Na_(2)SO_(4)-NH_(3)-CO_(2)-H_(2)O system were obtained.The results showed that ammonia in the Na_(2)SO_(4)-NH_(3)-H_(2)O system had a strong salt-out effect on sodium sulfate.Under the action of ammonia,the equilibrium solid phase of the system existed in the form of anhydrous sodium sulfate when the temperature was lower than 305.55K.At the same time,the solution of sodium sulfate ammonia salt water could promote the dissolution of sodium sulfate by carbonation of carbon dioxide.Low temperature andhigh pressure could promote the carbonation of sodium sulfate ammonia brine solution and improve the conversion of sodium sulfate to sodium bicarbonate.

关 键 词：硫酸钠 相平衡 碳酸化 氨气 碳酸氢钠 

分 类 号：TQ114.1[化学工程—无机化工] O642.42[理学—物理化学]