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Process optimization and mechanism study of ionic liquid-based mixed amine biphasic solvents for CO2 capture in biogas upgrading procedure

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Abstract

This study focused on enhancing the efficiency of methane upgrading and reducing energy consumption in the biogas upgrading process through the use of biphasic solvents. An aqueous-based biphasic solvent, comprising methyl monoethanolamine (MMEA), N-methyldiethanolamine (MDEA), and 1-butyl-3-methylimidazolium tetrafluoroborate (ItFB), was meticulously prepared. The biogas upgrading effect, regeneration efficiency, regeneration energy consumption, economic viability, selectivity, and phase separation characteristics of this absorbent were systematically analyzed. Various parameters, including different inlet flow rates, stirring rate, methane inlet concentrations, reaction temperatures, and amine mixing ratios, were adjusted to investigate their impact. A comprehensive evaluation was conducted on the biogas upgrading effect and substance migration trends of the biphasic solvent. Optimal process parameters were determined, demonstrating the favorable impact of the biphasic solvent on biogas upgrading. The upgraded gas achieved a methane purity exceeding 96%, and the regeneration energy consumption decreased by 44.27% compared to 30 wt.% MEA, resulting in a more than 50% improvement in economic efficiency. The interaction between the ionic liquid and carbamate facilitated the phase separation process, with carbon enrichment after separation exceeding 95%. This enhancement significantly contributed to the improvement of regeneration energy consumption. The study thus concludes that biphasic solvents, exemplified by the described aqueous-based solution, offer a promising avenue for effective biogas upgrading with notable advancements in economic and energy efficiency.

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Acknowledgements

We are thankful to the financial support by the National Natural Science Foundation of China (No. 22376115). The first author is funded by the Shanghai Tongji Gao Tingyao Environmental Science & Technology Development Foundation (China).

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Authors and Affiliations

  1. School of Environment, Tsinghua University, Bei**g, 100084, China

    Fanzhi Meng, Siyu Han, Li Lin, **glin Li, Kailun Chen & Jianguo Jiang

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  1. Fanzhi Meng
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  2. Siyu Han
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  3. Li Lin
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  4. **glin Li
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  5. Kailun Chen
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  6. Jianguo Jiang
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Correspondence to Jianguo Jiang.

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Declaration of Competing Interests The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Highlights

• MM/MD = 3:1 could achieve CO2 loading of 0.617 mol CO2/mol amine.

• MM/MD = 3:1 achieved a heat of CO2 desorption of 61.45 kJ/mol CO2.

• Regeneration energy of MM/MD = 3:1 was 47.20% lower than that of 30 wt.% MEA.

• The carbon enrichment rate of MM/MD = 3:1 still maintained above 95%.

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Meng, F., Han, S., Lin, L. et al. Process optimization and mechanism study of ionic liquid-based mixed amine biphasic solvents for CO2 capture in biogas upgrading procedure. Front. Environ. Sci. Eng. 18, 95 (2024). https://doi.org/10.1007/s11783-024-1855-9

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  • DOI: https://doi.org/10.1007/s11783-024-1855-9

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