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 ›› 2025, Vol. 57 ›› Issue (10): 55-63.doi: 10.19964/j.issn.1006-4990.2024-0550

• 研究与开发 • 上一篇    下一篇

纯碱和二氧化碳反应结晶过程研究

张梦寒1(), 杜威1, 徐泉2, 曹军2, 唐娜1()   

  1. 1.天津科技大学化工与材料学院,天津 300457
    2.江苏苏盐井神股份有限公司,江苏 淮安 223200
  • 收稿日期:2024-10-15 出版日期:2025-10-10 发布日期:2025-05-13
  • 通讯作者: 唐娜;E-mail:tjtangna@tust.edu.cn
  • 作者简介:张梦寒(2000— ),男,研究生,研究方向为制盐与盐化工;E-mail:2289151500@qq.com
  • 基金资助:
    国家重点研发计划项目(2022YFC2904005)

Study on reaction crystallization process of soda ash and carbon dioxide

ZHANG Menghan1(), DU Wei1, XU Quan2, CAO Jun2, TANG Na1()   

  1. 1. College of Chemical Engineering and Materials Science,Tianjin University of Science & Technology,Tianjin 300457,China
    2. Jiangsu Suyanjingshen Co. ,Ltd. ,Huai′an 223200,China
  • Received:2024-10-15 Published:2025-10-10 Online:2025-05-13

摘要:

为解决氨碱法煅烧工段中的粉碱和二氧化碳过剩问题,并探究纯碱和二氧化碳反应结晶过程的机理,以纯碱和二氧化碳为研究对象,探究Na2CO3溶液的浓度、CO2的流量和反应结晶温度对反应和结晶过程的影响规律,采用拉曼光谱仪在线监测Na2CO3和NaHCO3特征峰强度随反应结晶时间的变化趋势,通过标准曲线回归并结合相图分析,确定了反应体系点的变化路径、反应速率、成核速率和结晶速率。纯碱和二氧化碳的反应结晶分为3个阶段:纯碱和二氧化碳的反应阶段、碳酸氢钠的成核阶段和生长阶段,Na2CO3和CO2的最大反应速率为0.450 mol/(kg·min),NaHCO3的结晶(包括成核和生长过程)速率为0.083 mol/(kg·min),NaHCO3反应结晶的3个阶段中反应速率最大、结晶速率最小,说明碳酸氢钠的结晶是该过程的速率控制步骤。随CO2流量和温度的升高,反应速率、成核速率和结晶速率均增大。随碱液浓度的增加,纯碱与二氧化碳反应速率及NaHCO3的结晶速率均降低,而NaHCO3的成核速率随之提高,体系点的变化路径发生较大变化,最终分别进入NaHCO3的单一固相结晶区、NaHCO3和倍半碳酸钠的共析区,以及NaHCO3、倍半碳酸钠和一水碳酸钠的共析区。

关键词: 纯碱, NaHCO3, 反应结晶速率, 原位拉曼, 相图分析

Abstract:

This paper was aimed to address the problem of excess powder alkali and carbon dioxide in the calcination section of the ammonia-soda process and to explore the reaction and crystallization mechanism of sodium carbonate and carbon dioxide.Therefore,sodium carbonate and carbon dioxide were taken as the research objects to investigate the effect of the concentration of Na2CO3 solution,the flow rate of CO2,and the reaction crystallization temperature on the reaction and crystallization process.Raman spectrometer was used to monitor the changes in the intensity of characteristic peaks of Na2CO3 and NaHCO3 with reaction and crystallization time.Through standard curve regression and phase diagram analysis,the change path of the reaction system point,reaction rate,nucleation rate,and crystallization rate were determined.The reaction and crystallization of sodium carbonate and carbon dioxide could be divided into three stages:the reaction stage of sodium carbonate and carbon dioxide,the nucleation and growth stage of sodium bicarbonate.The maximum reaction rate of Na2CO3 and CO2 was 0.450 mol/(kg·min),and the crystallization rate(including nucleation and growth process) of NaHCO3 was 0.083 mol/(kg·min).The reaction rate was the fastest and the crystallization rate was the lowest in the three stages of the reaction and crystallization of sodium bicarbonate,indicating that the crystallization of sodium bicarbonate was the rate-controlling step of this process.With the increase of CO2 flow rate and temperature,the reaction rate,nucleation rate,and crystallization rate were all increased.With the increase of alkali solution concentration,the reaction rate of sodium carbonate and carbon dioxide and the crystallization rate of sodium bicarbonate were both decreased,while the nucleation rate of sodium bicarbonate increased,and the change path of the system point changed significantly.Eventually,they entered the single solid phase crystallization zone of sodium bicarbonate,the eutectic zone of sodium bicarbonate and sesquicarbonate,and the eutectic zone of sodium bicarbonate,sesquicarbonate and monohydrate sodium carbonate,respectively.

Key words: sodium carbonate, baking soda, reaction crystallization rate, in situ Raman, process phase diagram analysis

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