Trace Adsorption of Light Hydrocarbons at Low Temperatures: Influence of Carrier Gas Coadsorption

Trace Adsorption of Light Hydrocarbons at Low Temperatures: Influence of Carrier Gas Coadsorption
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低温下轻质烃的痕量吸附:载气共吸附的影响

DOI:
10.1021/acs.iecr.9b01572
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发表时间:
2019
影响因子:
4.2
通讯作者:
D. Bathen
D. Bathen
中科院分区:
工程技术3区
文献类型:
--
作者:
S. Schmittmann ; C. Pasel ; M. Luckas ; D. Bathen

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在痕量范围内的轻质烃的吸附分离过程中,由于低温和载气浓度比吸附剂高得多,可能会发生载气的显着共吸附。这会导致吸附剂容量降低,从而导致工业吸附剂设计出现问题以及对吸附机制的错误解释。迄今为止,关于载气影响的研究很少,并且没有低温数据。在这项工作中,我们展示了活性炭和沸石 13X 上 -80 至 +20 °C 温度下氮气和氦气中甲烷和乙烷的实验吸附等温线。吸附等温线和等量吸附焓的比较表明,共吸附随着低温、低分压以及吸附剂和吸附剂之间的相互作用弱而强烈增加。最后,活性炭上的共吸附比 13X 沸石上的共吸附更强。
During the adsorptive separation of light hydrocarbons in the trace range, significant coadsorption of the carrier gas may occur due to low temperatures and much higher concentrations of the carrier gas compared to the adsorptive. This results in a reduction of the adsorbent’s capacity, which leads to problems in industrial adsorber design and an incorrect interpretation of adsorption mechanisms. So far, there are only few studies on the carrier gas influence, and no data exist for low temperatures. In this work, we present experimental adsorption isotherms of methane and ethane from nitrogen and helium at temperatures between −80 and +20 °C on activated carbon and zeolite 13X. A comparison of the adsorption isotherms and the isosteric adsorption enthalpy reveals that coadsorption increases strongly with low temperatures, low partial pressures, and weak interactions between adsorptive and adsorbent. Finally, coadsorption is shown to be stronger on activated carbon than on zeolite 13X.
DOI: --
发表时间: 2013
期刊:
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