Novel composite membranes comprising silver salts physically dispersed in poly(ethylene-co-propylene) for the separation of propylene/propane

Jong Hak Kim, Byoung Ryul Min, Yong Woo Kim, Sang Wook Kang, Jongok Won, Yong Soo Kang

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11 Citations (Scopus)

Abstract

Novel composite membranes, which delivered high separation performance for propylene/propane mixtures, were developed by coating inert poly(ethylene-co- propylene) rubber (EPR) onto a porous polyester substrate, followed by the physical distribution of AgBF4. Scanning electron microscopy-wavelength dispersive spectrometer (SEM-WDS) revealed that silver salts were uniformly distributed in the EPR layer. The physical dispersion of the silver salts in the inert polymer matrix, without specific interaction, was characterized by FT-IR and FT-Raman spectroscopy. The high separation performance was presumed to stem from the in-situ dissolution of crystalline silver ionic aggregates into free silver ions, which acted as an active propylene carrier within a propylene environment, leading to facilitated propylene transport through the membranes. The membranes were functional at all silver loading levels, exhibiting an unusually low threshold carrier concentration (less than 0.06 of silver weight fraction). The separation properties of these membranes, i.e. the mixed gas selectivity of propylene/propane ∼55 and mixed gas permeance ∼7 GPU, were stable for several days.

Original languageEnglish
Pages (from-to)343-347
Number of pages5
JournalMacromolecular Research
Volume15
Issue number4
DOIs
Publication statusPublished - 2007 Jun

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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