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Adsorption of n-alkanes on carbon adsorbents at high temperatures

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Abstract

Adsorption of methane, ethane, and butane on two microporous carbon adsorbents was studied at T = 303, 313, 323, and 333 K. Measurements were carried out on a gravimetric-volumetric setup in a pressure range of 0.001–40 MPa. The adsorption volumes were determined using the theory of volume filling of micropores. The excess adsorption isotherms and the total content adsorption isotherms were calculated using the experimental data. The total content adsorption isotherms were used to plot the adsorption isosteres and to evaluate the initial and isosteric heats of adsorption. It was found that the heats of adsorption of ethane and butane on both adsorbents are higher than those of methane. It follows that the adsorbents under study can be used in adsorption-based systems for ethane and butane extraction from the natural gas streams. It was established that the ratios of the initial heat of adsorption of both ethane and butane to that of methane are in good agreement with the corresponding molecular polarizability ratios, which can be used to calculate the heats of adsorption. Namely, the initial heat of adsorption of a hydrocarbon can be evaluated using the experimentally determined initial heat of adsorption of the other hydrocarbon and the known molecular polarizabilities of both hydrocarbons without performing additional adsorption measurements.

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Authors and Affiliations

  1. A. N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Build. 4, 31 Leninsky prosp., 119071, Moscow, Russian Federation

    A. A. Pribylov & K. O. Murdmaa

Authors
  1. A. A. Pribylov
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  2. K. O. Murdmaa
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Correspondence to A. A. Pribylov.

Additional information

This work was carried out within the framework of the State Assignment “Surface Phenomena in Colloidal Dispersed Systems, Physicochemical Mechanics, Adsorption, and Chromatographic Processes” (Reg. No. 122011300053-8).

No human or animal subjects were used in this research.

The authors declare no competing interests.

Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, Vol. 72, No. 5, pp. 1107–1112, May, 2023.

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Pribylov, A.A., Murdmaa, K.O. Adsorption of n-alkanes on carbon adsorbents at high temperatures. Russ Chem Bull 72, 1107–1112 (2023). https://doi.org/10.1007/s11172-023-3878-y

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  • DOI: https://doi.org/10.1007/s11172-023-3878-y

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