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Permeation Behavior of Olefin/Nitrogen Gases through Siloxane based Polymeric Membranes  

이수복 (한국화학연구원 화학기술연구부 계면재료공정 연구팀)
신효진 (한국화학연구원 화학기술연구부 계면재료공정 연구팀, 충남대학교 공업화학과)
최승학 (한국화학연구원 화학기술연구부 계면재료공정 연구팀)
김정훈 (한국화학연구원 화학기술연구부 계면재료공정 연구팀)
박인준 (한국화학연구원 화학기술연구부 계면재료공정 연구팀)
노재성 (충남대학교 공업화학과)
강득주 ((주)제이오)
Publication Information
Membrane Journal / v.13, no.4, 2003 , pp. 246-256 More about this Journal
Abstract
For the olefin recovery from polyolefin off-gas, the permeation behaviors of olefins and nitrogen were investigated through three kinds of PDMS membranes - cross-linked PDMS membranes, a polysiloxaneimide membrane, and oligo-PDMS modified PDMS membranes. Their pure gas permeabilities were measured as a function of operation temperature(-20 to $50^{\circ}C$) and pressure(1 to 25 atm) with ethylene($C_2\;H_4$), propylene($C_3\;H_6$), butylene($C_4\;H_8$), and nitrogen($N_2$) gases. The permeabilities of olefins and nitrogen highly depended upon the nature of PDMS membranes. Among these membranes, cross-linked PDMS membranes showed stable and high olefin/nitrogen selectivities over a wide operation pressure range and further study in various test conditions. Their permeability of olefin and nitrogen were governed by the condensation temperature(solubility selectivity) and plasticization, not the order of the size(diffusivity selectivity) of gases, which matched well with the general permeation behavior of rubbery polymeric membranes for condensable and non-condensable gases. With increasing feed pressure or decreasing feed temperature, the permeabilities of more condensible olefins increase highly, presumably due to high solubility and plasticization, but that of non-condensible nitrogen decreases slightly and thus, the selectivities of olefin/nitrogen increase highly.
Keywords
Polydimethylsiloxane; Olefin; Nitrogen; Off-gas; Membrane;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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