Separation of Methane–Nitrogen Mixture by Pressure Swing Adsorption for Natural Gas Upgrading

变压吸附 甲烷 吸附 热扩散率 化学 微型多孔材料 分子筛 天然气 化学工程 热力学 扩散 材料科学 有机化学 物理 工程类
作者
Shubhra J. Bhadra,Shamsuzzaman Farooq
出处
期刊:Industrial & Engineering Chemistry Research [American Chemical Society]
卷期号:50 (24): 14030-14045 被引量:109
标识
DOI:10.1021/ie201237x
摘要

A dynamic pressure swing adsorption simulation model has been developed that caters for a detailed transport mechanism of nitrogen and methane in the micropores of both ETS-4 and CMS adsorbents. Five adsorbents, namely, barium-exchanged ETS-4 dehydrated at 400 °C (Ba400), strontium-exchanged ETS-4 dehydrated at 190 °C (Sr190) and 270 °C (Sr270), Bergbau–Forchung carbon molecular sieve (BF CMS), and Takeda carbon molecular sieve (Takeda CMS), have been selected for the simulation study in order to compare their performances for upgrading natural gas. The transport mechanisms of gases in CMS and ETS-4 adsorbents are different. In pressure swing adsorption (PSA) simulation, the binary equilibrium and kinetics are represented by the models that have recently been experimentally verified for methane–nitrogen mixture in Ba400, Sr190, and Sr270 adsorbents [Majumdar, B.; Bhadra, S. J.; Marathe, R. P.; Farooq, S. Ind. Eng. Chem. Res.2011, 50, 3021]. The multisite Langmuir isotherm is used for adsorption equilibrium. The kinetic model takes into account diffusion in both macropores and micropores and the concentration dependence of micropore diffusivity according to the chemical potential gradient as the driving force with constant limiting micropore diffusivity. It also has the provision to allow for the dual transport resistance and strong concentration dependence of the thermodynamically corrected micropore transport coefficients in CMS according to the published results [Huang, Q.; Farooq, S.; Karimi, I. A. Langmuir2003, 19, 5722]. Operating conditions have been identified that favor high recovery while simultaneously meeting the required pipeline specification for methane purity. The performance of the best sample for methane–nitrogen separation by PSA found from the simulation study, Ba400, is compared with published performances of ETS-4 and clinoptilolite. It has been found that, in addition to meeting pipeline specification, Ba400 also gives higher recovery, thus making this adsorbent a promising candidate for further exploration.
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