Study on preparation of carbon molecular sieves for pressure swing adsorption separation of CH<sub>4</sub>/N<sub>2</sub> and their separation performance

YUAN Ying; CHEN Yujia; HE Anping; LI Xu; LU Dehua; ZHAO Anmin; LI Kebing; HUANG Chen

doi:10.12434/j.issn.2097-2547.20230053

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Study on preparation of carbon molecular sieves for pressure swing adsorption separation of CH₄/N₂ and their separation performance

- Study on preparation of carbon molecular sieves for pressure swing adsorption separation of CH₄/N₂ and their separation performance
- Vol. 48, Issue 5, Pages: 155-162(2023)
- 作者机构：
  
  1.西南化工研究设计院有限公司工业排放气综合利用国家重点实验室，国家碳一化学工程技术研究中心，四川成都 610225
- 作者简介：
- 基金信息：
- DOI：10.12434/j.issn.2097-2547.20230053
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YUAN Ying, CHEN Yujia, HE Anping, et al. Study on preparation of carbon molecular sieves for pressure swing adsorption separation of CH₄/N₂ and their separation performance. [J]. Low-carbon Chemistry and Chemical Engineering 48(5):155-162(2023)
DOI：

YUAN Ying, CHEN Yujia, HE Anping, et al. Study on preparation of carbon molecular sieves for pressure swing adsorption separation of CH₄/N₂ and their separation performance. [J]. Low-carbon Chemistry and Chemical Engineering 48(5):155-162(2023) DOI： 10.12434/j.issn.2097-2547.20230053.

摘要

CH,4,/N,2,分离是高效利用天然气、煤层气、油田气、沼气和垃圾填埋气的关键技术。现有研究多集中于分离提纯CH,4,浓度较低（10%~50%，体积分数，下同）的混合气体。在CH,4,浓度较高（75%）的CH,4,/N,2,混合气体中，以提高碳分子筛对CH,4,的提浓效果为主要目标，分别对碳分子筛的制备改性和变压吸附测试工艺条件进行了研究。结果显示，以苯为沉积剂，在最优沉积条件（沉积温度为645 °C，沉积时间为60 min）下制备的碳分子筛对N,2,的吸附量为5.980 mL/g，对应的N,2,/CH,4,分离系数达到6.970；以上述最优条件制备的碳分子筛为吸附剂，以吸附压力0.3 MPa、吸附时间60 s，顺放、逆放、抽真空解吸为最佳单塔变压吸附工艺条件，产品气CH,4,浓度可提升至90%左右，产品气CH,4,收率达到80%以上。

Abstract

CH,4,/N,2, separation is a key technology for the efficient utilization of natural gas, coal-bed gas, oilfield gas, biogas, and landfill gas. Existing research has mostly focused on the separation and purification of low-concentration CH,4, (from 10% to 50%, volume fraction, the same below) in gas mixtures. In the case of CH,4,/N,2, mixtures with high CH,4, concentration (75%), the main objective is to enhance the CH,4, purification effect of carbon molecular sieves. The preparation and modification of carbon molecular sieves, as well as the process conditions for pressure swing adsorption testing, were investigated. The results show that carbon molecular sieves prepared with benzene as the deposition agent under optimal deposition conditions (deposition temperature of 645 °C, deposition time of 60 min) exhibit the N,2, adsorption capacity of 5.980 mL/g, and the corresponding N,2,/CH,4, separation factor reach 6.970. Using the carbon molecular sieves prepared under the aforementioned optimal conditions as the adsorbent, the best single-tower pressure swing adsorption process conditions for adsorption pressure of 0.3 MPa, adsorption time of 60 s, and operation with normal releasing pressure to the set pressure then inverse releasing and vacuum, result in an increase of the CH,4, concentration in the product gas to around 90% and a CH,4, recovery rate of over 80%.

关键词

碳分子筛变压吸附碳沉积CH4/N2分离

Keywords

carbon molecular sievepressure swing adsorptioncarbon depositionCH4/N2 separation

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College of Chemical Engineering and Technology, Taiyuan University of Technology

State Key Laboratory of Industrial Vent Gas Reuse, Southwest Institute of Chemical Co., Ltd.

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National Engineering Research Center for C1 Chemistry, State Key Laboratory of Industrial Vent Gas Reuse, Southwest Institute of Chemical Co., Ltd.

State Key Laboratory of Industrial Vent Gas Reuse, National Engineering Research Center for C1 Chemistry, Southwest Institute of Chemical Co., Ltd.

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Study on preparation of carbon molecular sieves for pressure swing adsorption separation of CH4/N2 and their separation performance

DOI：10.12434/j.issn.2097-2547.20230053

摘要

Abstract

关键词

Keywords

references

Study on preparation of carbon molecular sieves for pressure swing adsorption separation of CH₄/N₂ and their separation performance