Adsorption of Light Alkanes and Alkenes on Activated Carbon and Zeolite 13X at Low Temperatures
Adsorption of Light Alkanes and Alkenes on Activated Carbon and Zeolite 13X at Low Temperatures
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DOI：
10.1021/acs.jced.9b00948
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发表时间：
2020-02-01
期刊：
影响因子：
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通讯作者：
Bathen, Dieter
中科院分区：
文献类型：
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作者：
Schmittmann, Sonja;Pasel, Christoph;Bathen, Dieter
短链烷烃和烯烃的分离具有挑战性，因为它们的化学相似，因此能源成本高昂。低温吸附过程的实施可能会克服这一问题，但关于低温下轻烃吸附的系统研究几乎是缺乏的。因此，作为第一步，在本文中，我们提出了乙烷、乙烯、丙烷和丙烯在活性碳(AC)和13X沸石上的单组分吸附等温线，温度为-80-+20℃，分压为5-1250Pa.在这些实验数据的基础上，讨论了吸附剂与化学不同表面的相互作用及其与温度的关系。结果表明，随着温度的降低，AC和13X沸石的容量都有较大幅度的提高。低温吸附提高了烷烃-烯烃分离的总体(计算)选择性，特别是对13X沸石。
The separation of short-chained alkanes and alkenes is challenging because of their chemical similarity and thus being costly in energy. The implementation of a cryogenic adsorption process may overcome this problem, but systematic studies on light hydrocarbon adsorption at low temperatures are virtually lacking. Therefore, as a first step, in this paper, we present single-component adsorption isotherms of ethane, ethylene, propane, and propylene on activated carbon (AC) and zeolite 13X for temperatures of -80 to +20 degrees C and partial pressures of 5-1250 Pa. Based on these experimental data, the interactions of the adsorptives with the chemically different surfaces and their temperature dependence are discussed. Results show a strong increase in capacity with decreasing temperature for both AC and zeolite 13X. Cryogenic adsorption increases the overall (calculated) selectivity of alkane-alkene separation, especially for the zeolite 13X.