DIMETHYL ETHER MANUFACTURE METHOD FROM ASSOCIATED GAS BY USING MEMBRANE

摘要

According to the present invention, a method of preparing dimethyl ether from an associated gas by using a separation membrane is configured to include: a removing and absorbing moisture step (S10) of removing moisture included in an associated gas; two separation membrane steps including a primary refining step and a secondary refining step; a removing and absorbing hydrogen sulfide step (S40) of removing hydrogen sulfide contained in a second mixed gas (G2); a synthesis gas producing and reforming step (S50) of producing a synthesis gas consisting of hydrogen, carbon monoxide, and carbon dioxide; a synthesis gas purifying step (S60) of discharging a synthesis gas from which the carbon dioxide is removed; and a producing dimethyl ether step (S70) of being provided with the synthesis gas from which the carbon dioxide is removed to produce dimethyl ether by a synthesis reactor. The present invention configured as described above includes any one material selected from a bis trifluoromethyl-difluoro dioxole-tetrafluoroethylene copolymer and a sulfonyl fluoride vinyl-tetrafluoroethylene copolymer, and separates and refines carbon dioxide and hydrogen sulfide from an associated gas by primary and secondary purification steps using a separation membrane in which permeation selectivity with respect to carbon dioxide and hydrocarbon is 10 or more to reduce a loss rate of hydrocarbon contained in the associated gas and effectively separates and refines moisture, carbon dioxide, and hydrogen sulfide that are impurities contained in the associated gas to produce economical dimethyl ether.