Mechanistic study of magnesium carbonate semibatch reactive crystallization with magnesium hydroxide and CO2

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

doi:10.1021/ie501706j

Mechanistic study of magnesium carbonate semibatch reactive crystallization with magnesium hydroxide and CO₂

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

^*Corresponding author for this work

Not published at Aalto University

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13 Citations (Scopus)

Abstract

This work investigates semibatch precipitation of magnesium carbonate at ambient temperature and pressure using Mg(OH)₂ and CO₂ as starting materials. A thermal analysis method was developed that reflects the dissolution rate of Mg(OH)₂ and the formation of magnesium carbonate. The method was successfully used to determine the composition of solids precipitated from the reaction. Concentration profiles of Mg²⁺ and total carbon over time were determined from the liquid phase. The influence of CO₂ flow rate and stirring rate on precipitation was analyzed based on comprehensive information from the liquid and solid phases. A stirring rate of 650 rpm was found to be the optimum speed as the flow rate of CO₂ was 1 L/min. Precipitation rate increased with gas flow rate, which indicates that mass transfer of CO₂ plays a critical role in this precipitation case. Magnesium carbonate trihydrate (nesquehonite) was formed as a bunch of needle-like primary crystals.

Original language	English
Pages (from-to)	12077-12082
Number of pages	6
Journal	Industrial and Engineering Chemistry Research
Volume	53
Issue number	30
DOIs	https://doi.org/10.1021/ie501706j
Publication status	Published - 30 Jul 2014
MoE publication type	A1 Journal article-refereed

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abstract = "This work investigates semibatch precipitation of magnesium carbonate at ambient temperature and pressure using Mg(OH)2 and CO2 as starting materials. A thermal analysis method was developed that reflects the dissolution rate of Mg(OH)2 and the formation of magnesium carbonate. The method was successfully used to determine the composition of solids precipitated from the reaction. Concentration profiles of Mg2+ and total carbon over time were determined from the liquid phase. The influence of CO2 flow rate and stirring rate on precipitation was analyzed based on comprehensive information from the liquid and solid phases. A stirring rate of 650 rpm was found to be the optimum speed as the flow rate of CO2 was 1 L/min. Precipitation rate increased with gas flow rate, which indicates that mass transfer of CO2 plays a critical role in this precipitation case. Magnesium carbonate trihydrate (nesquehonite) was formed as a bunch of needle-like primary crystals.",

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T1 - Mechanistic study of magnesium carbonate semibatch reactive crystallization with magnesium hydroxide and CO2

AU - Han, Bing

AU - Qu, Haiyan

AU - Niemi, Harri

AU - Sha, Zuoliang

AU - Louhi-Kultanen, Marjatta

PY - 2014/7/30

Y1 - 2014/7/30

N2 - This work investigates semibatch precipitation of magnesium carbonate at ambient temperature and pressure using Mg(OH)2 and CO2 as starting materials. A thermal analysis method was developed that reflects the dissolution rate of Mg(OH)2 and the formation of magnesium carbonate. The method was successfully used to determine the composition of solids precipitated from the reaction. Concentration profiles of Mg2+ and total carbon over time were determined from the liquid phase. The influence of CO2 flow rate and stirring rate on precipitation was analyzed based on comprehensive information from the liquid and solid phases. A stirring rate of 650 rpm was found to be the optimum speed as the flow rate of CO2 was 1 L/min. Precipitation rate increased with gas flow rate, which indicates that mass transfer of CO2 plays a critical role in this precipitation case. Magnesium carbonate trihydrate (nesquehonite) was formed as a bunch of needle-like primary crystals.

AB - This work investigates semibatch precipitation of magnesium carbonate at ambient temperature and pressure using Mg(OH)2 and CO2 as starting materials. A thermal analysis method was developed that reflects the dissolution rate of Mg(OH)2 and the formation of magnesium carbonate. The method was successfully used to determine the composition of solids precipitated from the reaction. Concentration profiles of Mg2+ and total carbon over time were determined from the liquid phase. The influence of CO2 flow rate and stirring rate on precipitation was analyzed based on comprehensive information from the liquid and solid phases. A stirring rate of 650 rpm was found to be the optimum speed as the flow rate of CO2 was 1 L/min. Precipitation rate increased with gas flow rate, which indicates that mass transfer of CO2 plays a critical role in this precipitation case. Magnesium carbonate trihydrate (nesquehonite) was formed as a bunch of needle-like primary crystals.

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JO - Industrial and Engineering Chemistry Research

JF - Industrial and Engineering Chemistry Research

SN - 0888-5885

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Mechanistic study of magnesium carbonate semibatch reactive crystallization with magnesium hydroxide and CO₂

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