Aliphatic Alcohol Blended MDEA Solutions for Improved COS Removal: Inspired From Mechanistic Studies on CO <sub>2</sub> and COS Absorption
ABSTRACT COS removal from natural gas is one of the crucial challenges in gas purification. The present study separately investigated the 13 C NMR characterizations and absorption kinetics of CO 2 and COS by aqueous MDEA solution, and the results indicated that their absorptions may proceed by similar absorption mechanism. Inspired by the solubility limited COS absorption kinetics, a list of C 4 ‐C 6 aliphatic alcohols blended MDEA solutions were explored for COS and CO 2 absorption. It was found that they could improve the COS absorption capacity much better than similar sulfolane blended MDEA solution, and specially, they could improve the absorption selectivity of COS over CO 2 . For example, under the identical conditions, using n ‐hexanol blended MDEA solution achieved 4.0 M concentration of the HCO 3 − anion for COS absorption vs 1.2 M for the sulfolane blended MDEA solution, while it was 3.4 M vs 4.8 M for CO 2 absorption by n ‐hexanol vs sulfolane blended MDEA solution.
Authors
- Guochuan Yin
- Jinjin Li (ORCID: https://orcid.org/0000-0002-6547-048X)
- Jingwen Xue (ORCID: https://orcid.org/0000-0003-2318-0553)
- Gang Xiong (ORCID: https://orcid.org/0000-0002-4303-5559)
- Wenzhao Zhu
- Shuang‐Long Li
Institutions
- Huazhong University of Science and Technology (CN)
- Gas Technology Institute (US)
Publication Details
- Journal
- ChemistrySelect
- Published
- 2026-02-01
- DOI
- https://doi.org/10.1002/slct.202503238
- Primary Topic
- Carbon Dioxide Capture Technologies
- Type
- article
- Field-Weighted Citation Impact
- 0.00