Hydrocarbon separation using large pore zeolitic imidazolate frameworks

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Metal organic frameworks (MOFs) are microporous crystalline materials with pore tunability and structural versatility. Due to their partial organic nature, metal organic frameworks are preferred fillers in fabricating the mixed matrix membranes (MMMs) without interfacial voids. Among various MOF families, zeolitic imidazolate frameworks (ZIFs) have gained recent interest due to its stability under humid conditions and superior molecular sieving properties. Up to date, ZIF structures with small pore aperture (typically, < 4.5A) have been largely reported and promising separation performances in natural gas processing and light hydrocarbon processing are investigated. Recently, ZIFs with extra-large pore dimensions (with aperture size > 0.45nm) with 8, 12 and 14-membered ring structure have been reported ᅳ these large pore apertures are extremely useful in the separation of hydrocarbon molecules with a kinetic diameter larger than 0.45nm. In this study, energy-efficient separation of light-to-heavy hydrocarbons (C4+) will be demonstrated using ZIFs with extra-large pore ZIFs. Vapor sorption isotherm and kinetic uptakes of the hydrocarbon molecules for large pore ZIFs are thoroughly analyzed. Entropic contribution for the diffusion selectivity in ZIFs are exclusively investigated and the corresponding membrane separation performance are tested in the form of MMMs.
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한국화학공학회 2018년도 가을 총회 및 학술대회

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CBE-Conference Papers(학술회의논문)
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