纯碱和二氧化碳反应结晶过程研究

doi:10.19964/j.issn.1006-4990.2024-0550

Abstract

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

CLC Number:

TQ127.1

ZHANG Menghan, DU Wei, XU Quan, CAO Jun, TANG Na. Study on reaction crystallization process of soda ash and carbon dioxide[J]. Inorganic Chemicals Industry, 2025, 57(10): 55-63.

Figures/Tables 11

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温度/℃		曲线方程	R²
45	Na₂CO₃	y=198.4x-1 270.1	0.994 1
45	NaHCO₃	y=79.749x-54.878	0.998 7
60	Na₂CO₃	y=111.95x+989.24	0.997 4
60	NaHCO₃	y=46.555x-132.28	0.998 3
75	Na₂CO₃	y=74.001x-126.3	0.999 4
75	NaHCO₃	y=89.414x-219.02	0.999 6

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Inorganic Acid-Base-Salt Committee of CIESC

Study on reaction crystallization process of soda ash and carbon dioxide

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