Theoretical investigation of the possibility of using multicomponent (N2-O2-CH4-Y2O) clathrate hydrates for methane recovery from mine gas

Phase Equilibria and Methane Enrichment of Clathrate Hydrates of Mine Ventilation Air + Tetrabutylphosphonium Bromide

“…23,24 However, the methane concentrations in these studies were relatively high, over 25 vol%. Only one theoretical study undertaken by Adamova et al 25 reports the hydrate formation pressure of coal mine gas with dilute methane (0.5 vol% CH 4 , 75 vol% N 2 and 24.5 wt% O 2 ) and suggests that it might be possible to upgrade methane from MVA using gas hydrate technology.…”

Development of Combustion Technology for Methane Emitted from Coal‐Mine Ventilation Air Systems

“…[32] Thep otential of this procedure for the production of al ean methane containingg as stream was further studied by using as tatistical thermodynamic approach to predict hydratef ormation as af unction of reaction pressure. [33] This theoretical study showedt hat enrichmento f methane from VA Mb yu sing the hydrate-based gas separation methodw as achievable.R ecente xperimental work by Du et al confirmed the possibility of enriching lean methane mixtures from mine VA by using the clathrateh ydrate technique. [34] They used tetrabutyl phosphonium bromide (TBPB) as ah ydrate promoter, resulting in 0.5 vol %o f methane in air being enriched up to 3.5 times in the hydrate phase.T he pressurer equired to reduce the hydrate is high (in the range of 1.92-18.55 MPa) and as such application in aV AM stream would present considerable practical challenges.…”

Enrichment of low concentration methane: an overview of ventilation air methane

“…Unconventional technologies that have been investigated for gas separation include vortex tubes, 19–23 mechanical towers, 24,25 gas hydrates, 26–28 membranes 29,30 and adsorption based separation. 31–35 The first three (vortex tubes, gas hydrates and mechanical towers) are technologies/concepts without commercial applications currently, but the last two (membrane separation and adsorption-based separation) have been used on a commercial scale for natural gas and other gas separation.…”

“…Herein, for the first time, we present a review to discuss and analyze the technologies and materials for VAM enrichment. Because the conventional technologies widely used for CH 4 separation/purification from natural gas (CH 4 concentration of 55–98%) are not suitable for VAM enrichment, we first discuss the unconventional technologies including vortex tubes, 19–23 mechanical towers, 24,25 gas hydrates, 26–28 membranes 29,30 and adsorption based processes, 31–35 with focus on adsorption-based processes. Since the adsorbents used in adsorption-based processes are one of the key factors for gas separation/enrichment performance, we then discuss various materials including zeolites, porous carbon materials and metal–organic frameworks (MOFs) that are potentially useful as adsorbents for VAM and other low grade CH 4 enrichment, with focus on porous carbon materials and MOFs.…”