Natural gas sweetening using a cellulose triacetate hollow fiber membrane illustrating controlled plasticization benefits
| Autor: | Daniel Chinn, Yang Liu, William J. Koros, Atsushi Morisato, Zhongyun Liu, Nitesh Bhuwania |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
business.industry Synthetic membrane Filtration and Separation 02 engineering and technology Permeance 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Biochemistry 0104 chemical sciences Cellulose triacetate chemistry.chemical_compound Membrane chemistry Chemical engineering Natural gas Hollow fiber membrane General Materials Science Fiber Gas composition Physical and Theoretical Chemistry 0210 nano-technology business |
| Zdroj: | Journal of Membrane Science. 601:117910 |
| ISSN: | 0376-7388 |
| Popis: | Plasticization is a well-understood drawback of polymer membranes in many applications; however, recent studies have demonstrated surprising advantages of this phenomenon for demanding natural gas sweetening for some glassy polymer dense film membranes. Moving beyond dense film membranes, the current study focuses on cellulose triacetate (CTA) hollow fiber membranes to use the benefits of controlled plasticization for realistic raw natural gas sweetening. Natural gas sweetening can be complicated by co-existence of condensable hydrocarbons, e.g. C2H6, C3H8 and toluene with the main H2S/CO2/CH4 ternary mixture; moreover, the operating temperature and pressure adds another dimension to this important separation. In this study, we consider an aggressive gas composition of high H2S (20 mol.%), low CO2 (5 mol.%), and significant amounts of C2H6 (3 mol.%) and C3H8 (3 mol.%) as well as trace amount of toluene (100–300 ppm) with CH4 comprising the rest of the feed. Various temperatures (35 °C and 50 °C) and pressures (6.9–31.3 bar) are also considered. We show a controlled plasticization benefit for the CTA hollow fiber membrane, with attractive CO2 and H2S permeance (>110 GPU) and selectivity (22–28) for CO2 and H2S over CH4 at 35 °C and 31.3 bar. The current study represents a major step forward in processes for membrane-based natural gas sweetening using practical asymmetric membranes. |
| Databáze: | OpenAIRE |
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