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DME 제조공정에서 발생하는 혼합가스 중, CO2를 제거하기 위하여 폴리술폰 고분자를 이용하여 지지체 중공사막을 제조하고, Hyflon AD를 코팅하여 복합막을 제조하였다. 제조된 중공사막을 이용하여 Flaring 모사가스에 대한 모듈의 성능을 측정하였다. 분리막 1단 평가 결과 1.2 MPa에서 Stage cut 0.24 이상의 CO2농도는 3% 이하이며, 동일조건에서 CO2 제거율 및 CH4 회수율은 각각 약 80%이다. 분리막 2단 평가결과 Product 가스의 CO2 농도를 5%로 고정하였을 때, stage cut 0.074에서 recycle 되는 CO2 농도는 공급가스와 같은 농도를 가지며, 이때 CH4의 회수율은 약 99%이다.
We prepared composite membrane which was made with polysulfone supported hollow fiber membrane coated with Hyflon AD to eliminate CO2 gas from mixed-gases which were generated in DME manufacturing processes. The performance of module about simulated flaring gas was measured by using manufactured composite membrane. 1-stage evaluation result shows CO2 concentration was below 3% at 1.2 MPa and at Stage cut 0.24 above. In addition CO2 removal rate and CH4 recovery rate was 80% respectively at the same condition. 2-stage evaluation result shows, when the CO2 concentration of product gas was fixed at 5%, recycled CO2 at stage cut 0.074 had the same concentration as the feed gas and the recovery rate of CH4 was 99% at the moment.
