Abstract
The paper presents a synthesis of deep eutectic solvents (DESs) based on choline chloride (ChCl) as hydrogen bond acceptor and phenol (Ph), glycol ethylene (EG), and levulinic acid (Lev) as hydrogen bond donors in 1:2 molar ratio. DESs were successfully used as absorption solvents for removal of dimethyl disulfide (DMDS) from model biogas steam. Several parameters affecting the absorption capacity and absorption rate have been optimized including kinds of DES, temperature, the volume of absorbent, model biogas flow rate, and initial concentration of DMDS. Furthermore, reusability and regeneration of DESs by means of adsorption and nitrogen barbotage followed by the mechanism of absorptive desulfurization by means of density functional theory (DFT) as well as FT-IR analysis were investigated. Experimental results indicate that the most promising DES for biogas purification is ChCl:Ph, due to high absorption capacity, relatively long absorption rate, and easy regeneration. The research on the absorption mechanism revealed that van der Waal interaction is the main driving force for DMDS removal from model biogas.
Highlights
More and more attention is paid to the production of alternative high-quality fuels, including bio-methane, bio-hydrogen, bio-ethanol, bio-butanol, etc
Optimization of absorption conditions using deep eutectic solvents was carried out for dimethyl disulfide (DMDS) as the main representative of volatile organosulfur compounds commonly found in real biogas streams [7,47,48,49,50]
The process was optimized in terms of deep eutectic solvents (DESs) type, temperature, the volume of DES, model biogas flow, and initial concentration of DMDS
Summary
More and more attention is paid to the production of alternative high-quality fuels, including bio-methane, bio-hydrogen, bio-ethanol, bio-butanol, etc. There are many technologies to remove impurities from biogas, which are classified into three main categories: physical (e.g., absorption, adsorption, condensation), chemical (e.g., catalytic oxidation, thermal oxidation, ozonation), and biological (e.g., bio-scrubbers, bio-filters, activated sludge) [13,14,15,16]. Most of these methods are expensive and complicated, more and more attention is paid to optimize them in terms of low energy consumption and high efficiency [17,18,19,20]. For the better understand the mechanism of DMDS removal, FT-IR and density functional analysis were employed
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