CO2 separation using a hybrid choline-2-pyrrolidine-carboxylic acid/polyethylene glycol/water absorbent

Document identifier: oai:DiVA.org:ltu-76484
Access full text here:10.1016/j.apenergy.2019.113962
Keyword: Engineering and Technology, Mechanical Engineering, Energy Engineering, Teknik och teknologier, Maskinteknik, Energiteknik, Ionic liquid, Carbon dioxide, Property, Solubility, Modeling
Publication year: 2020
Relevant Sustainable Development Goals (SDGs):
SDG 9 Industry, innovation and infrastructureSDG 3 Good health and wellbeing
The SDG label(s) above have been assigned by OSDG.ai

Abstract:

Developing novel hybrid absorbents is essential for CO2 separation. In this study, the density and viscosity of a hybrid absorbent (choline-2-pyrrolidine-carboxylic acid/polyethylene glycol/water ([Cho][Pro]/PEG200/H2O)) were measured experimentally, and its CO2 solubility was also determined. The excess mole volume and excess Gibbs energy of activation of the hybrid absorbent were further estimated to understand the molecular structure and interactions between [Cho][Pro]/PEG200 and H2O. The CO2 solubilities in [Cho][Pro]/PEG200 and [Cho][Pro]/H2O were analyzed and described using the Redlich–Kwong non-random-two-liquid (RK-NRTL) model. Furthermore, the CO2 solubility in the hybrid absorbent was predicted using the RK-NRTL model and was compared with the new experimental results for verification. The effect of H2O on the CO2 absorption performance was further analyzed. The performance and cost of the hybrid absorbent were compared with those of other commercialized CO2 absorbents. In addition, the recyclability of the hybrid absorbent for CO2 separation was studied. The results of this study indicated that the hybrid absorbent could be promising for CO2 separation.

Authors

Yifeng Chen

Luleå tekniska universitet; Energivetenskap
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Yunhao Sun

Luleå tekniska universitet; Energivetenskap; Key Laboratory of Material and Chemical Engineering, Nanjing Tech University, Nanjing, China
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Zhuhong Yang

Key Laboratory of Material and Chemical Engineering, Nanjing Tech University, Nanjing, China
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Xiaohua Lu

Key Laboratory of Material and Chemical Engineering, Nanjing Tech University, Nanjing, China
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Xiaoyan Ji

Luleå tekniska universitet; Energivetenskap
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