Aromatic block co-polyimide membranes for sour gas feed separations
| Autor: | Feras Hamad, Abdulaziz Y. Ammar, Ahmed W. Ameen, Melhan M. Ben Sultan, Mohammad S. Qahtani, Garba O. Yahaya, Ahmad A. Bahamdan, Rashed H. Alhajry |
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| Rok vydání: | 2016 |
| Předmět: |
General Chemical Engineering
Analytical chemistry 02 engineering and technology General Chemistry Permeation 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Cellulose acetate Industrial and Manufacturing Engineering 0104 chemical sciences law.invention chemistry.chemical_compound Membrane chemistry Magazine law Acid gas Copolymer Environmental Chemistry Sour gas Organic chemistry 0210 nano-technology Polyimide |
| Zdroj: | Chemical Engineering Journal. 304:1020-1030 |
| ISSN: | 1385-8947 |
| Popis: | Permeation properties of pure and gas mixture consisting of CO 2 , H 2 S, CH 4 , N 2 and C 2 H 6 through dense films of the block co-polyimides (6FDA-mPDA)-(6FDA-durene) are studied at 35–55 °C and pressures of 100–500 psi for combined separation of CO 2 , H 2 S and N 2 from acid gas streams. The H 2 S composition in the gas mixture is up to 20 vol%. This rigid block copolymer exhibits relatively constant or slightly decrease in pure gas permeability with increasing feed pressure for most of the penetrants. The pure gas CO 2 /CH 4 and N 2 /CH 4 selectivities are up to 61 and 2.6 respectively. The mixed gas studies also show relatively constant or slightly decrease in permeability coefficients with increase in pressure for most of the penetrants. One significant fact is that, at feed pressure of 500 psi and 20 vol% H 2 S in feed gas mixture (consisting of CO 2 , N 2 , CH 4 and H 2 S), H 2 S/CH 4 and CO 2 /CH 4 separation factors are 23 and 27 respectively. These values are within the same order of magnitude or even better than those obtained in other state-of-the-art polymeric membranes that have been reported. Another unique feature of this co-polyimide is that, in addition to being selective to acid gas, it is also more selective to N 2 as compare to CH 4. Moreover, the CO 2 /CH 4 separation factor does not suffer significant loss to the same degree as in the case of cellulose acetate (CA), even under these much more aggressive environments. This stability at moderate pressures and high H 2 S concentration is quite remarkable, as most reported studies are focused on low H 2 S concentrations and low pressures. |
| Databáze: | OpenAIRE |
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