Development of CO2 phase change absorbents by means of the cosolvent effect

The CO2 phase change absorbent, CPCA, as a novel alternative absorbent, has attracted great attention recently. In this work, the CPCAs composed of MDEA/C4–C6 alcohol/H2O were developed by means of the cosolvent effect. The cosolvent effect of MDEA on the solubility of C4–C6 alcohols in H2O was veri...

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Bibliographic Details
Published in:Green chemistry : an international journal and green chemistry resource : GC 2018, Vol.20 (10), p.2328-2336
Main Authors: Yang, Fushen, Jin, Xianhang, Fang, Jiawei, Tu, Weiwei, Yang, Ye, Cui, Chunhua, Zhang, Weidong
Format: Article
Language:English
Subjects:
Absorbents
Absorption
Alcohols
Butanol
Carbon dioxide
Cycles
Green chemistry
Phase change
Phase transitions
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Summary:The CO2 phase change absorbent, CPCA, as a novel alternative absorbent, has attracted great attention recently. In this work, the CPCAs composed of MDEA/C4–C6 alcohol/H2O were developed by means of the cosolvent effect. The cosolvent effect of MDEA on the solubility of C4–C6 alcohols in H2O was verified. The CPCAs composed of MDEA/1-butanol/H2O were further examined including the species distributions, absorption rate, cycling capacity and regenerability. The initial absorption rates of all CPCAs were higher than that of 30% MDEA, and its maximum value was 2.5 times higher. A different behavior was shown for the CPCAs that an increase in the absorption rate was observed for a period of time when the CPCAs became turbid. The optimal CO2 cycling capacity of CPCA was 2.48 mol CO2 kg−1, which was 70% higher compared to 30 wt% MDEA.
ISSN:1463-9262
1463-9270
DOI:10.1039/c8gc00283e