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 °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.

中文翻译：

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低温下活性炭和13X沸石上轻链烷烃的吸附

短链烷烃和烯烃的分离具有挑战性，因为它们的化学相似性，因此能源成本很高。低温吸附过程的实施可以克服​​这个问题，但实际上缺乏对轻烃在低温下吸附的系统研究。因此，作为第一步，在本文中，我们介绍了在温度为-80至+20°C且分压为-80的情况下，乙烷，乙烯，丙烷和丙烯在活性炭（AC）和13X沸石上的单组分吸附等温线。 5 – 1250 Pa。基于这些实验数据，讨论了吸附剂与化学不同表面的相互作用及其温度依赖性。结果表明，AC和13X沸石的容量都随着温度的降低而大大增加。