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Crystallization kinetics and the role of equilibrium in carbon capture systems with gas-liquid-solid equilibrium : Case study of AMP in NMP solution

Sanku, Meher G. LU and Svensson, Helena LU (2020) In Fluid Phase Equilibria 511.
Abstract

A semi-empirical power law-based theory has been developed to model the crystallization kinetics in precipitating systems for CO2 capture. A more reliable activity-based theory and simplified concentration-based crystallization kinetics have also been derived for a gas-liquid-solid system in which CO2 evolution might be unavoidable during the experiments performed to determine crystallization kinetics. The power law is based on the concept of the metastable zone. Changes in the metastable zone width are therefore discussed when complex chemistry is involved (as in the case of CO2 capture). 2-Amino-2-methyl-1-propanol (AMP) in the organic solvent N-methyl pyrrolidinone (NMP) was used as a case study, and... (More)

A semi-empirical power law-based theory has been developed to model the crystallization kinetics in precipitating systems for CO2 capture. A more reliable activity-based theory and simplified concentration-based crystallization kinetics have also been derived for a gas-liquid-solid system in which CO2 evolution might be unavoidable during the experiments performed to determine crystallization kinetics. The power law is based on the concept of the metastable zone. Changes in the metastable zone width are therefore discussed when complex chemistry is involved (as in the case of CO2 capture). 2-Amino-2-methyl-1-propanol (AMP) in the organic solvent N-methyl pyrrolidinone (NMP) was used as a case study, and the kinetics for the precipitation of the salt resulting from the capture of CO2 were determined using the developed theory. The theory required thermodynamic property modeling of the AMP-NMP-CO2 system, which was accomplished using equilibrium solubility experiments with equilibrium times of at least 330 min. The model was developed in Aspen Plus using the ENRTL-RK property model. The meta-stable zone width varied with varying loading. The logarithm of the activity-based supersaturation ratio should be considered a more reliable measure of supersaturation. It was also found that concentration-based relative supersaturation was a good approximation of the supersaturation ratio for the case of AMP in NMP. However, approximating the supersaturation ratio with the concentration difference was found to be too error-prone.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
CCS, Crystallization kinetics, Gas-liquid-solid, Precipitating
in
Fluid Phase Equilibria
volume
511
article number
112505
external identifiers
  • scopus:85078984959
ISSN
0378-3812
DOI
10.1016/j.fluid.2020.112505
language
English
LU publication?
yes
id
e92c1a45-c069-4e6e-ab6b-17f5278d4c0e
date added to LUP
2020-02-14 09:24:29
date last changed
2020-02-26 07:41:48
@article{e92c1a45-c069-4e6e-ab6b-17f5278d4c0e,
  abstract     = {<p>A semi-empirical power law-based theory has been developed to model the crystallization kinetics in precipitating systems for CO<sub>2</sub> capture. A more reliable activity-based theory and simplified concentration-based crystallization kinetics have also been derived for a gas-liquid-solid system in which CO<sub>2</sub> evolution might be unavoidable during the experiments performed to determine crystallization kinetics. The power law is based on the concept of the metastable zone. Changes in the metastable zone width are therefore discussed when complex chemistry is involved (as in the case of CO<sub>2</sub> capture). 2-Amino-2-methyl-1-propanol (AMP) in the organic solvent N-methyl pyrrolidinone (NMP) was used as a case study, and the kinetics for the precipitation of the salt resulting from the capture of CO<sub>2</sub> were determined using the developed theory. The theory required thermodynamic property modeling of the AMP-NMP-CO<sub>2</sub> system, which was accomplished using equilibrium solubility experiments with equilibrium times of at least 330 min. The model was developed in Aspen Plus using the ENRTL-RK property model. The meta-stable zone width varied with varying loading. The logarithm of the activity-based supersaturation ratio should be considered a more reliable measure of supersaturation. It was also found that concentration-based relative supersaturation was a good approximation of the supersaturation ratio for the case of AMP in NMP. However, approximating the supersaturation ratio with the concentration difference was found to be too error-prone.</p>},
  author       = {Sanku, Meher G. and Svensson, Helena},
  issn         = {0378-3812},
  language     = {eng},
  series       = {Fluid Phase Equilibria},
  title        = {Crystallization kinetics and the role of equilibrium in carbon capture systems with gas-liquid-solid equilibrium : Case study of AMP in NMP solution},
  url          = {http://dx.doi.org/10.1016/j.fluid.2020.112505},
  doi          = {10.1016/j.fluid.2020.112505},
  volume       = {511},
  year         = {2020},
}