Abstract: A process for treating methane-containing gas including CO2 and at least one compound of volatile organic compounds (VOC) wherein the methane-containing gas mixture is compressed, cooled and supplied to an absorption apparatus absorbing liquid VOC reversibly and at least a portion of the VOC is absorbed from the methane-containing gas mixture yielding a methane-containing and VOC- and CO2-reduced gas mixture and VOC- and CO2-loaded absorption means. The VOC- and CO2-loaded absorption means is transported from the absorption apparatus to a desorption apparatus. The methane-containing and VOC-reduced gas mixture is supplied from the absorption apparatus to a separation apparatus for CO2 removal. A regeneration gas stream includes at least a portion of the CO2-enriched gas stream which regenerates the VOC- and CO2-loaded absorption means.

Abstract: A process for treating methane-containing gas including CO2 and at least one compound of volatile organic compounds (VOC) wherein the methane-containing gas mixture is compressed, cooled and supplied to an absorption apparatus absorbing liquid VOC reversibly and at least a portion of the VOC is absorbed from the methane-containing gas mixture yielding a methane-containing and VOC- and CO2-reduced gas mixture and VOC- and CO2-loaded absorption means. The VOC- and CO2-loaded absorption means is transported from the absorption apparatus to a desorption apparatus. The methane-containing and VOC-reduced gas mixture is supplied from the absorption apparatus to a separation apparatus for CO2 removal. A regeneration gas stream includes at least a portion of the CO2-enriched gas stream which regenerates the VOC- and CO2-loaded absorption means.

Abstract: A process for removing CO2 from a methane-containing gas, having the steps of providing a methane-containing gas containing at least CO2 as an impurity, cooling the gas to remove CO2 from the methane-containing gas by freezing out same, and additionally reducing the CO2 concentration of the gas using a pressure temperature swing adsorption apparatus (PTSA), whereby a methane-enriched product gas is obtained. At least a part of the product gas is then used as treatment gas and is passed through the PTSA for treatment of the PTSA, whereby CO2 is absorbed by the treatment gas and is removed from the PTSA as a CO2-enriched treatment gas. The treatment gas is then recycled and admixed with the methane containing gas.

Abstract: A process for removing CO2 from a methane-containing gas, having the steps of providing a methane-containing gas containing at least CO2 as an impurity, cooling the gas to remove CO2 from the methane-containing gas by freezing out same, and additionally reducing the CO2 concentration of the gas using a pressure temperature swing adsorption apparatus (PTSA), whereby a methane-enriched product gas is obtained. At least a part of the product gas is then used as treatment gas and is passed through the PTSA for treatment of the PTSA, whereby CO2 is absorbed by the treatment gas and is removed from the PTSA as a CO2-enriched treatment gas. The treatment gas is then recycled and admixed with the methane containing gas.