Separation of H<sub class="a-plus-plus">2sub>S from CH<sub class="a-plus-plus">4sub> by polymeric membranes at different H<sub class="a-plus-plus">2sub>S concentrations
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- 作者：S. M. S. Niknejad ; H. Savoji…
- 关键词：PPO and PEUU membranes ; Mixed gas permeation ; Acid gas ; Plasticization ; Competitive sorption
- 刊名：International Journal of Environmental Science and Technology
- 出版年：2017
- 出版时间：February 2017
- 年：2017
- 卷：14
- 期：2
- 页码：375-384
- 全文大小：
- 刊物主题：Environment, general; Environmental Science and Engineering; Environmental Chemistry; Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution; Soil Science & Conservati
- 出版者：Springer Berlin Heidelberg
- ISSN：1735-2630
- 卷排序：14
文摘
In this work, permeation of mixed gases H<sub>2sub>S/CH<sub>4sub> through commercial polyphenylene oxide (PPO) hollow fiber and poly (ester urethane) urea (PEUU) flat membranes was studied at pressures of 345–689 kPa, at ambient temperature and at 313.15 K. Various H<sub>2sub>S concentrations of about 100–5000 ppm in CH<sub>4sub> binary synthetic gas mixtures as well as a real natural gas sample obtained from a gas refinery containing 0.3360 mol.% H<sub>2sub>S (equivalent to 3360 ppm) were tested. It was observed that the permeance of components was affected by the balance between competitive sorption and plasticization effects. Separation factors of H<sub>2sub>S/CH<sub>4sub> were in the range of 1.3–2.9, 1.8–3.1 and 2.2–4.3 at pressures of 345, 517 and 689 kPa, respectively. In the range of 101–5008 ppm of H<sub>2sub>S in CH<sub>4sub>, the effect of temperature on the separation factor was nearly negligible; however, permeances of both components of the mixtures increased with temperature. Additionally, the results obtained by PEUU membrane indicated that it was a better choice for hydrogen sulfide separation from H<sub>2sub>S/CH<sub>4sub> mixtures than PPO. For PPO membrane, removal of hydrogen sulfide from high-concentration (up to 5008 ppm) binary mixtures of H<sub>2sub>S/CH<sub>4sub> was compared with that of low concentration (as low as 101 ppm) through PPO. At concentrations of 101–968 ppm, plasticization was dominant compared with the competitive sorption, while for the H<sub>2sub>S feed concentrations of 3048 ppm, the competitive sorption effect was dominant. For H<sub>2sub>S concentration of 5008 ppm, the balance between these two effects played an important role for explanation of its trend.