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Korean Chemical Engineering Research,
Vol.49, No.4, 498-504, 2011
Vol.49, No.4, 498-504, 2011
폴리이미드와 폴리이써설폰 분리막을 이용한 CH4/N2의 투과선택도 특성
A Study on the Permeance Through Polymer Membranes and Selectivity of CH4/N2
본 연구는 폴리이미드와 폴리이서설폰 중공사막을 이용하여 매립가스의 메탄 회수를 위한 메탄과 질소에 대한 투과도와 선택도를 실험하였다. 폴리이미드와 폴리이서설폰 소재를 건/습식 상전이 법을 이용하여 중공사 형태로 제조하고 표면 실리콘 코팅 후 모듈을 제조하였다. 전자주사 현미경 관찰을 이용하여 제조된 중공사 막의 구조가 치밀한 표면과 망상구조의 비대칭으로 형성된 것을 확인하였다. 압력과 온도가 증가함에 따라 메탄과 질소의 투과도는 증가하였으나 선택도(CH4/N2)는 감소하는 것으로 나타났다. Air gap이 증가할수록 메탄과 질소의 투과도는 감소하였으며 용매치환을 한 중공사막의 투과도는 3.2~7.0배 증가하였다.
In this research, hollow fiber membranes were used in order to investigate to permeation and selectivity of the CH4 and N2. Polyimide and polyethersulfone hollow fiber membrane were prepared by the dry-wet phase inversion method and the module was manufactured by fabricating fibers after surface coating with silicone elastomer. The scanning electron microscopy (SEM) studies showed that the produced fibers typically had an asymmetric structure. The permeance of CH4 and N2 were increased with pressure and temperature. However, the selectivity was decreased with increasing temperature. The permeances of CH4 and N2 were decreased with increasing the air gap and the effect of posttreatment on membrane showed the increase in permeance up to 3.2~7.0 times.
Keywords:
Polyimide Membrane; Polyethersulfone Membrane; Hollow Fiber Membrane; Biogas; Gas Separation; Methane; Nitrogen
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