Boron-embedded hydrolyzed PIM-1 carbon membranes for synergistic ethylene/ethane purification

Kuo Sung Liao, Susilo Japip, Juin Yih Lai, Tai-Shung Chung*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

For the first time, boron embedded carbon membranes have shown superior C2H4 permeability and C2H4/C2H6 selectivity to the upper bound line under both pure and mixed gas tests. The precursors of the carbon membranes were prepared by incorporating various boron compounds with different molecular sizes into a hydrolyzed polymer of intrinsic microporosity (PIM-1) and then carbonized at 700 °C. The increments in C2H4 permeability and C2H4/C2H6 selectivity followed the order of molecular size of the boron compounds. Both PALS results and CO2 adsorption isotherms confirmed the enlarged pore size and increased pore amount. The enhancements in C2H4 permeability and C2H4/C2H6 selectivity were mainly due to the higher C2H4 diffusivity and greater diffusion selectivity resulting from proper choices of boron additives and carbonization conditions. When 9,9-dihexylfluorene-2,7-diboronic acid (DHFDA) was embedded into the hydrolyzed PIM-1 and then carbonized at 700 °C, the C2H4 permeability and C2H4/C2H6 selectivity of the carbonized membrane under mixed gas tests increased from 7.5 to 13.7 Barrer and from 9.3 to 9.7, respectively.

Original languageEnglish (US)
Pages (from-to)92-99
Number of pages8
JournalJournal of Membrane Science
Volume534
DOIs
StatePublished - Jan 1 2017

Keywords

  • Boron compound
  • Carbon molecular sieve
  • Hydrolyzed PIM-1
  • Olefin/paraffin separation
  • Pore size

ASJC Scopus subject areas

  • Biochemistry
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Filtration and Separation

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