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首页> 外文期刊>Separation and Purification Technology >Adsorption equilibrium of carbon dioxide,methane and nitrogen onto Na- and H-mordenite at high pressures
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Adsorption equilibrium of carbon dioxide,methane and nitrogen onto Na- and H-mordenite at high pressures

机译：高压下二氧化碳，甲烷和氮气在Na-和H-丝光沸石上的吸附平衡

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摘要

In this work,the adsorption equilibrium isotherms of carbon dioxide,methane and nitrogen on Na- and H-mordenite at three temperatures (279,293 and 308 K) for pressures up to 2 MPa have been obtained.For Na-mordenite,the selectivity order is: carbon dioxide methane > nitrogen.The selectivity order is the same for H-mordenite,although the selectivity ratio CO_2/CH_4 is smaller and the CH_4/N_2 ratio is larger,the latter being due to the lower affinity of nitrogen to H-mordenite.All the isotherms can be reproduced adequately with the Toth model,including the effect of temperature on the model parameters.The adsorption capacity for methane and nitrogen is recovered with vacuum in both adsorbents,whereas this does not apply to carbon dioxide for Na-mordenite.H-mordenite offers selectivity ratios higher than 3 at subatmospheric pressures for carbon dioxide/methane,carbon dioxideitrogen and methaneitrogen mixtures,making this adsorbent suitable for the separation of these mixtures by a vacuum swing adsorption process.
机译：在这项工作中，获得了在最高温度为2 MPa的三个温度（279,293和308 K）下Na-和H-丝光沸石上二氧化碳，甲烷和氮的吸附平衡等温线。对于Na-丝光沸石，选择性顺序为：二氧化碳甲烷>氮。H-丝光沸石的选择顺序相同，尽管选择性比CO_2 / CH_4较小，CH_4 / N_2比较大，这是由于氮对H的亲和力较低-丝光沸石。所有等温线都可以用Toth模型充分再现，包括温度对模型参数的影响。两种吸附剂的甲烷和氮气吸附容量均通过真空回收，但不适用于二氧化碳中的Na H-丝光沸石在低于大气压的条件下对二氧化碳/甲烷，二氧化碳/氮气和甲烷/氮气混合物的选择性高于3，这使得该吸附剂适合通过以下方式分离这些混合物真空摆动吸附过程。

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