Recovery of CO<sub>2</sub> Using Temperature‐Responsive Amine Gel Slurry

Amano, Yuto; Nagasawa, Yuma; Seida, Yoshimi; Gotoh, Takehiko; Furuya, Eiji

doi:10.1002/masy.201800165

Cited by 1 publication

(1 citation statement)

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“…Alcohol is known to absorb CO 2 better than water, and the CO 2 solubility decreases in higher alcohols [19,20,21,22]. Adding 10%–30% of ethanol, 2-propanol, 2-butanol, tert -butanol, and dimethylsulfoxide to the slurry reduced the desorption temperature of CO 2 , as was intended; however, the addition caused a significant reduction in the cycle capacity for CO 2 [23]. The addition of NaCl resulted in a decrease in both CO 2 solubility and the adsorption capacity of the gel with the increase of its concentration (0.01–0.1 M) in the slurry [23].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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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.

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