DIMETHYL ETHER MANUFACTURE METHOD FROM ASSOCIATED GAS BY USING MEMBRANE

• Main Authors: LEE, CHUNG SEOP, HA, SEONG YONG, KIM, HACK EUN, KOH, HYUNG CHUL, MO, YONG GI, BAE, MYONG WON
• Format: Patent
• Language: English; Korean
• Published: 15.06.2016
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; CHEMISTRY; METALLURGY; ORGANIC CHEMISTRY

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. 본 발명의 분리막을 사용하여 수반가스로부터의 디메틸에테르 제조방법은 수반가스에 포함된 수분을 제거시키는 수분제거 흡착단계(S10)와, 제1정제단계와 제2정제단계로 이루어진 두 단계의 분리막공정과, 제2혼합가스(G2)에 포함된 황화수소를 제거시키는 황화수소제거 흡착단계(S40)와, 수소, 일산화탄소 및 이산화탄소로 이루어진 합성가스가 제조되어지는 합성가스제조 리포머단계(S50)와, 이산화탄소가 제거된 합성가스를 배출시키는 합성가스 정제단계(S60)와, 이산화탄소가 제거된 합성가스를 공급받아 디메틸에테르 합성반응기에 의해 디메틸에테르가 제조되는 디메틸에테르 제조단계(S70)로 구성된다. 상기와 같이 구성된 본 발명은 비스트리플루오르메틸디플루오르디옥솔-테트라플루오르에틸렌 공중합체, 설포닐플루오라이드바이닐이서-테트라플루오르에틸렌 공중합체 중에서 선택된 어느 하나의 소재로 이루어지며, 이산화탄소와 탄화수소에 대한 투과선택도가 적어도 10 이상인 분리막을 사용하는 제1,2정제단계에 의해 수반가스로부터 이산화탄소와 황화수소를 분리정제시켜 수반가스에 포함된 탄화수소의 손실율을 저감시키고, 수반가스에 포함된 불순물인 수분과 이산화탄소 및 황화수소를 효과적으로 분리정제시켜 경제성을 갖는 디메틸에테르를 생산할 수 있다.