Enhancement of CO2 absorption/desorption efficiencies of aqueous Methyl-diethanol amine (MDEA) via hybridization of Sulfolane and MIL-101-NH2(Cr)

Articles in Press

Document Type : Original Research Paper

Authors

1 Semnan University

2 University of Tehran

10.22059/poll.2025.402056.3109

Abstract

To improve the absorption and desorption performance of aqueous MDEA solution, a hybrid solvent composed of 40 wt.% MDEA and 20 wt.% sulfolane was prepared and systematically evaluated under varying pressure conditions. At low and moderate pressures, the conventional aqueous MDEA solution exhibited a higher CO₂ absorption capacity in comparison to the hybrid solution, indicating its effectiveness in less pressurized environments. However, under high-pressure conditions, the hybrid solution demonstrated superior performance, achieving a higher CO₂ molality of 3.28 mol·kg⁻¹, surpassing the 2.94 mol·kg⁻¹ observed for the aqueous MDEA solution. This enhanced capacity highlights the beneficial interaction between MDEA and sulfolane at elevated pressures. Additionally, the hybrid formulation improved the regeneration efficiency by 3.7% relative to the standard MDEA solution, indicating better solvent recyclability. The incorporation of 0.1 wt.% MIL-101-NH₂(Cr) nanoparticles into the hybrid solvent further enhanced system performance, increasing CO₂ molality by 17.1% and elevating the regeneration efficiency to 99.45% at an operating temperature of 80°C, demonstrating the potential of nanomaterials in optimizing CO₂ capture processes.

Keywords

Main Subjects

Pollution

Articles in Press, Accepted Manuscript
Available Online from 21 December 2025

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