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Evaluation of separation effect for CH4 enrichment from coalbed methane (CBM) under the synergistic action of temperature and pressure based on IAST theory
Greenhouse Gases: Science and Technology ( IF 2.7 ) Pub Date : 2021-04-05 , DOI: 10.1002/ghg.2068
Yuannan Zheng 1, 2 , Qingzhao Li 1 , Guiyun Zhang 1 , Yang Zhao 1 , Xinxin Liu 1
Affiliation  

The synergistic pressure and temperature swing adsorption (SPTSA) technology is designed for purifying coalbed methane (CBM) are proposed in this work. Cyclic processes including four steps: cooling, pressurization, heating, and depressurization. Ideal adsorption solution theory (IAST) was used to evaluate the separation effect. Super activated carbons (SACs) with specific surface area exceeds 3000 m2 g−1 were prepared and used as adsorbents. From 273 to 373 K, the adsorption selectivity (S) changes more than 4, while the S changes less than 2 with the pressure changes from 0.1 to 9 MPa, indicating that temperature change is more conducive to improve the CH4 purity compared to the pressure change. However, more CH4 purification capacity can be obtained by pressure change. In cyclic SPTSA process, the CH4 purification capacity is generally increased by more than 30% compared with the pressure swing adsorption technology, which indicated that CH4 separation and purification under the synergistic action of temperature and pressure is theoretically feasible and has a broad prospect in the CBM purification. © 2021 Society of Chemical Industry and John Wiley & Sons, Ltd.

中文翻译:

基于IAST理论的温压协同作用下煤层气富集CH4分离效果评价

本文提出了协同变压变温吸附(SPTSA)技术用于净化煤层气(CBM)。循环过程包括四个步骤:冷却、加压、加热和减压。理想吸附溶液理论(IAST)用于评价分离效果。制备了比表面积超过3000 m 2 g -1 的超级活性炭(SAC)并将其用作吸附剂。从 273 到 373 K,吸附选择性 ( S ) 变化大于 4,而随着压力从 0.1 到 9 MPa,S变化小于 2,说明温度变化更有利于提高 CH 4纯度与压力变化相比。然而,通过压力变化可以获得更多的CH 4净化能力。在循环SPTSA工艺中,CH 4净化能力较变压吸附技术普遍提高30%以上,表明温度和压力协同作用下CH 4分离纯化在理论上是可行的,具有广阔的前景。在煤层气净化中。© 2021 化学工业协会和 John Wiley & Sons, Ltd.
更新日期:2021-04-05
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