Separation of ethane/ethylene and propane/propylene systems with a carbonized BPDA-pp'ODA polyimide membrane

Hayashi Jun-Ichiro, Hirotaka Mizuta, Masatake Yamamoto, Katsuki Kusakabe, Shigeharu Morooka, Soong Hyuck Suh

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121 Citations (Scopus)

Abstract

A BPDA-pp'ODA polyimide film was formed on the outer surface of a porous alumina support tube (outside diameter, 2.4 mm; inside diameter, 1.8 mm; void fraction, 0.48; and average pore size, 140 nm) and was then carbonized at an optimized temperature of 700 ̊C. Membranes prepared by repeating this process two and three times respectively exhibited permeances of approximately 1 × 10-8 mol·m-2·s-1·Pa-1 for C2H4 and 2 × 10-9 mol·m-2·s-1·Pa-1 for C2H6 at 100 °C. Permeances to C3H6 and C3H8 at 100 °C were 4 × 4 × 10-9 and 1 × 10-10 mol·m-2·s-1·Pa1, respectively. The selectivities were 4-5 for C2H4/C2H6 systems and 25-29 for C3H6/C3H8 systems. When the permeation temperature was decreased to 65 and 35 °C, permeances decreased and selectivities increased to 5-7 for C2H4/C2H6 systems and 33-56 for C3H6/C3H8 systems. The permeance and selectivity for an equimolar mixture of C3H6 and C3H8 were nearly the same as those for the single-component gases.

Original languageEnglish
Pages (from-to)4176-4181
Number of pages6
JournalIndustrial and Engineering Chemistry Research
Volume35
Issue number11
DOIs
Publication statusPublished - Jan 1 1996

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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