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Influence of Hydrophobicity of Backbone Polymer in Thermo-responsive Hydrogel with Immobilized Amine on Cycle Capacity for Absorption and Recovery of CO2

1
Department of Applied Chemistry, Meiji University, 214−8571 Kawasaki, Japan
2
Natural Science Laboratory, Toyo University, 112−8606 Tokyo, Japan
3
Department of Chemical Engineering, Graduate School of Engineering, Hiroshima University, 739−8527 Higashi Hiroshima, Japan
*
Author to whom correspondence should be addressed.
Polymers 2019, 11(6), 1024; https://doi.org/10.3390/polym11061024
Received: 6 April 2019 / Revised: 31 May 2019 / Accepted: 7 June 2019 / Published: 10 June 2019
(This article belongs to the Special Issue Hydrogels and Gels for Biomedical and Sustainable Applications)
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Abstract

The chemisorption process with amines is the major separation and recovery method of CO2 because of its high processing capacity and simplicity. However, large energy consumption for the desorption of CO2 is also associated with the process. To develop a separation and recovery process that is capable of desorbing CO2 at low temperatures and with minimal energy consumption, polymer hydrogels with a lower critical solution temperature (LCST) polymer network and amine groups immobilized in the polymer network of the hydrogels were exploited. Thermo-responsive amine gels with a series of hydrophobicity of polymer networks were systematically synthesized, and the influence of the hydrophobicity of the gels on the CO2 desorption temperature and cycle capacity (CO2 amount that can be separated and recovered by 1 cycle of temperature swing operation) was investigated using slurries with the series of gels. A significant decrease in the CO2 desorption temperature and increase in the cycle capacity occurred simultaneously by lowering the LCST of the gels via hydrophobisation of the polymer network. Based on an equilibrium adsorption model representing the CO2 separation and a recovery system with the gel slurries, an analysis of the system dynamics was performed in order to understand the recovery mechanism in the process.
Keywords: thermo-responsive hydrogel; tertiary amine; CO2; adsorption; equilibrium sorption model thermo-responsive hydrogel; tertiary amine; CO2; adsorption; equilibrium sorption model
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Nagasawa, Y.; Seida, Y.; Gotoh, T.; Furuya, E. Influence of Hydrophobicity of Backbone Polymer in Thermo-responsive Hydrogel with Immobilized Amine on Cycle Capacity for Absorption and Recovery of CO2. Polymers 2019, 11, 1024.

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