Mass Transfer and Kinetics Study of Heterogeneous Semi-Batch Precipitation of Magnesium Carbonate

Bing Han; Haiyan Qu; Harri Niemi; Zuoliang Sha; Marjatta Louhi-Kultanen

doi:10.1002/ceat.201300855

Mass Transfer and Kinetics Study of Heterogeneous Semi-Batch Precipitation of Magnesium Carbonate

Bing Han^*, Haiyan Qu, Harri Niemi, Zuoliang Sha, Marjatta Louhi-Kultanen

^*Corresponding author for this work

Not published at Aalto University

Research output: Contribution to journal › Article › Scientific › peer-review

13 Citations (Scopus)

Abstract

Precipitation kinetics and mass transfer of magnesium carbonate (MgCO₃) hydrates from a reaction of magnesium hydroxide (Mg(OH)₂) and CO₂ were analyzed. The effect of CO₂ flow rate and mixing intensity on precipitation was investigated under ambient temperature and atmospheric pressure. Raman spectroscopy was used to determine the composition of the solids during semi-batch crystallization. The obtained spectra revealed the dissolution of Mg(OH)₂ and the formation of MgCO₃. The precipitation rate increased with higher gas flow rate. The rotation speed of the stirrer had a significant effect on the dissolution of Mg(OH)₂. In the researched system, the main driver of the precipitation kinetics was the mass transfer of CO₂. Nesquehonite (MgCO₃·3H₂O), as needle-like crystals, was precipitated as the main product. Raman spectroscopy can serve as a potential tool to monitor the carbonation precipitation process.

Original language	English
Pages (from-to)	1363-1368
Number of pages	6
Journal	Chemical Engineering and Technology
Volume	37
Issue number	8
DOIs	https://doi.org/10.1002/ceat.201300855
Publication status	Published - 2014
MoE publication type	A1 Journal article-refereed

Keywords

Magnesium carbonate
Mass transfer
Precipitation kinetics
Raman spectroscopy

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10.1002/ceat.201300855

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abstract = "Precipitation kinetics and mass transfer of magnesium carbonate (MgCO3) hydrates from a reaction of magnesium hydroxide (Mg(OH)2) and CO2 were analyzed. The effect of CO2 flow rate and mixing intensity on precipitation was investigated under ambient temperature and atmospheric pressure. Raman spectroscopy was used to determine the composition of the solids during semi-batch crystallization. The obtained spectra revealed the dissolution of Mg(OH)2 and the formation of MgCO3. The precipitation rate increased with higher gas flow rate. The rotation speed of the stirrer had a significant effect on the dissolution of Mg(OH)2. In the researched system, the main driver of the precipitation kinetics was the mass transfer of CO2. Nesquehonite (MgCO3·3H2O), as needle-like crystals, was precipitated as the main product. Raman spectroscopy can serve as a potential tool to monitor the carbonation precipitation process.",

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AU - Han, Bing

AU - Qu, Haiyan

AU - Niemi, Harri

AU - Sha, Zuoliang

AU - Louhi-Kultanen, Marjatta

PY - 2014

Y1 - 2014

N2 - Precipitation kinetics and mass transfer of magnesium carbonate (MgCO3) hydrates from a reaction of magnesium hydroxide (Mg(OH)2) and CO2 were analyzed. The effect of CO2 flow rate and mixing intensity on precipitation was investigated under ambient temperature and atmospheric pressure. Raman spectroscopy was used to determine the composition of the solids during semi-batch crystallization. The obtained spectra revealed the dissolution of Mg(OH)2 and the formation of MgCO3. The precipitation rate increased with higher gas flow rate. The rotation speed of the stirrer had a significant effect on the dissolution of Mg(OH)2. In the researched system, the main driver of the precipitation kinetics was the mass transfer of CO2. Nesquehonite (MgCO3·3H2O), as needle-like crystals, was precipitated as the main product. Raman spectroscopy can serve as a potential tool to monitor the carbonation precipitation process.

AB - Precipitation kinetics and mass transfer of magnesium carbonate (MgCO3) hydrates from a reaction of magnesium hydroxide (Mg(OH)2) and CO2 were analyzed. The effect of CO2 flow rate and mixing intensity on precipitation was investigated under ambient temperature and atmospheric pressure. Raman spectroscopy was used to determine the composition of the solids during semi-batch crystallization. The obtained spectra revealed the dissolution of Mg(OH)2 and the formation of MgCO3. The precipitation rate increased with higher gas flow rate. The rotation speed of the stirrer had a significant effect on the dissolution of Mg(OH)2. In the researched system, the main driver of the precipitation kinetics was the mass transfer of CO2. Nesquehonite (MgCO3·3H2O), as needle-like crystals, was precipitated as the main product. Raman spectroscopy can serve as a potential tool to monitor the carbonation precipitation process.

KW - Magnesium carbonate

KW - Mass transfer

KW - Precipitation kinetics

KW - Raman spectroscopy

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Mass Transfer and Kinetics Study of Heterogeneous Semi-Batch Precipitation of Magnesium Carbonate

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Keywords

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