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A zeolite membrane module composed of SAPO-34 hollow fibers for use in fluorinated gas enrichment

Lee, Pyung Soo, Lim, Min Soo, Park, Ahrumi, Park, Hosik, Nam, Seung-Eun, Park, You-in
Journal of membrane science 2017 v.542 pp. 123-132
aluminum oxide, artificial membranes, carbon dioxide, energy, greenhouse gases, zeolites
A membrane module composed of SAPO-34 hollow fibers was constructed for the enrichment of NF3, a strong greenhouse gas with a 100-year global warming potential (GWP)¹1A measure of how much energy the emission of 1t of a gas will absorb over 100 years, compared to the emission of 1t of carbon dioxide (CO2). of > 17,000. Growth of the SAPO-34 membrane was investigated on the alumina hollow fibers using in-situ growth and secondary growth methods. Heterogeneous nucleation of SAPO-34 crystal took place on the surface because of hetero-atoms existing on the support, contributing to early development of continuous zeolite film. Zeolite membranes were successfully prepared from both in-situ and secondary growth. The membrane prepared by secondary growth presented N2 permeance as high as 168.4 GPU with an N2/NF3 gas selectivity of 580.7. A SAPO-34 membrane module was assembled using the hollow fiber membranes produced by secondary growth, but separation performance of the module was reduced to N2 permeance of 136.4 GPU with an N2/NF3 gas selectivity of 133.7. When used for the enrichment of NF3 gas, a superior yield (98%) and enrichment ratio (20) were obtained from the module at a stage-cut of 0.95.