Non-Aqueous Solvent Mixtures for CO 2 Capture: Choline Hydroxide-Based Deep Eutectic Solvents Absorbent Performance at Various Temperatures and Pressures

Mohd Azlan Kassim (), Nor Afifah Sulaiman, Rozita Yusoff and Mohamed Kheireddine Aroua
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Mohd Azlan Kassim: Research Centre for Carbon Dioxide Capture and Utilisation (CCDCU), School of Engineering and Technology, Sunway University, No. 5 Jalan Universiti, Bandar Sunway, Petaling Jaya 47500, Selangor, Malaysia
Nor Afifah Sulaiman: Research Centre for Carbon Dioxide Capture and Utilisation (CCDCU), School of Engineering and Technology, Sunway University, No. 5 Jalan Universiti, Bandar Sunway, Petaling Jaya 47500, Selangor, Malaysia
Rozita Yusoff: Chemical Engineering Department, Faculty of Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia
Mohamed Kheireddine Aroua: Research Centre for Carbon Dioxide Capture and Utilisation (CCDCU), School of Engineering and Technology, Sunway University, No. 5 Jalan Universiti, Bandar Sunway, Petaling Jaya 47500, Selangor, Malaysia

Sustainability, 2023, vol. 15, issue 12, 1-14

Abstract: Carbon dioxide (CO 2 ) absorption in a non-aqueous solution is a potential technology for reducing greenhouse gas emissions. In this study, a non-aqueous solvent, sulfolane and dimethylsulfoxide (DMSO), was functionalized with a deep eutectic solvent (DES) consisting of choline hydroxide and polyamines diethylenetriamine (DETA) and triethylenetetramine (TETA). The non-aqueous absorbents’ CO 2 absorption ability was investigated in a high-pressure absorption reactor with a variable absorption temperature (303.15–333.15 K) and pressure (350–1400 kPa). The results showed that 2M ChOH:TETA−DMSO solution had the highest CO 2 loading capacity when compared with other screened solutions, such as 2M ChOH:TETA−Sulfolane, 2M ChOH:DETA−DMSO and 2M ChOH:DETA−Sulfolane. It was also found that the absorption capacity increased with increasing pressure and decreased with temperature. The highest CO 2 absorption by 2M ChOH:TETA−DMSO was observed at a partial pressure of 1400 kPa at 303.15 K 1.2507 mol CO 2 /mol DES. The use of a non-aqueous solvent in the mixture showed a phase separation phenomenon after the CO 2 absorption reaction due to the formation of insoluble carbamate salt, which was identified through FTIR analysis. These findings suggest that the use of a DES polyamine mixed with a non-aqueous solvent could be a promising solution for CO 2 capture.

Keywords: deep eutectic solvent; polyamine; CO 2 absorption; non-aqueous (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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Citations: View citations in EconPapers (1)

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