Separation of ethane/ethylene and propane/propylene systems with a carbonized BPDA-pp{prime}ODA polyimide membrane
- Kyushu Univ., Fukuoka (Japan). Dept. of Chemical Science and Technology
- Keimyung Univ., Taegu (Korea, Republic of). Dept. of Chemical Engineering
A BPDA-pp{prime}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 {times} 10{sup {minus}8} mol/m{sup 2}{center_dot}s{center_dot}Pa for C{sub 2}H{sub 4} and 2 {times} 10{sup {minus}9} mol/m{sup 2}{center_dot}s{center_dot}Pa for C{sub 2}H{sub 6} at 100 C. Permeances to C{sub 3}H{sub 6} and C{sub 3}H{sub 8} at 100 C were 4 {times} 10{sup {minus}9} and 1 {times} 10{sup {minus}10} mol/m{sup 2}{center_dot}s{center_dot}Pa, respectively. The selectivities were 4--5 for C{sub 2}H{sub 4}/C{sub 2}H{sub 6} systems and 25--29 for C{sub 3}H{sub 6}/C{sub 3}H{sub 8} systems. When the permeation temperature was decreased to 65 and 35 C, permeances decreased and selectivities increased to 5--7 for C{sub 2}H{sub 4}/C{sub 2}H{sub 6} systems and 33--56 for C{sub 3}H{sub 6}/C{sub 3}H{sub 8} systems. The permeance and selectivity for an equimolar mixture of C{sub 3}H{sub 6} and C{sub 3}H{sub 8} were nearly the same as those for the single-component gases.
- OSTI ID:
- 404565
- Journal Information:
- Industrial and Engineering Chemistry Research, Journal Name: Industrial and Engineering Chemistry Research Journal Issue: 11 Vol. 35; ISSN IECRED; ISSN 0888-5885
- Country of Publication:
- United States
- Language:
- English
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