Thermodynamic investigation of water evaporation process from a-cyclodextrin hydrates Full article
Journal |
The Journal of Chemical Thermodynamics
ISSN: 1096-3626 , E-ISSN: 0021-9614 |
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Output data | Year: 2021, Volume: 158, Article number : 106424, Pages count : 5 DOI: 10.1016/j.jct.2021.106424 | ||
Tags | a-Cyclodextrin Dehydration Vapor pressure Phase transition Thermodynamic characteristics | ||
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Abstract:
The pressure of saturated water vapor over a-CD nH2O hydrates has been measured by static method with membrane-gauge manometer. The temperature dependences of water vapor pressure were obtained in the wide range of temperatures (298–404 K), pressures (0.2–119.7 kPa) and water content (2.61 n 4.61) under condition of a quasi-constant composition of the a-CD nH2O samples. It was observed that water vapor pressure increases proportionally with growth of water content in the a- CD nH2O hydrate samples. The phase transition was revealed at temperature T = 344 K and its thermodynamic characteristics were determined. The values of enthalpy and entropy of water evaporation process from a-CD nH2O (n = 1) were calculated. The analytical expressions for the lnp – 1/T dependences obtained by the approximation of the experimental data enable to calculate the vapor pressure of the a-CD nH2O hydrates within the studied temperature range for any n from 2.61 to 6.10. Experimental data were used to obtain changes in the Gibbs energy when water molecules bind to the a-CD framework. The thermodynamic characteristics obtained in this work are new and valuable data not only for fundamental areal, but also for practical applies.
Cite:
Zelenina L.N.
, Chusova T.P.
, Isakov A.V.
, Rodionova T.V.
, Villevald G.V.
, Manakov A.Y.
Thermodynamic investigation of water evaporation process from a-cyclodextrin hydrates
The Journal of Chemical Thermodynamics. 2021. V.158. 106424 :1-5. DOI: 10.1016/j.jct.2021.106424 WOS OpenAlex
Thermodynamic investigation of water evaporation process from a-cyclodextrin hydrates
The Journal of Chemical Thermodynamics. 2021. V.158. 106424 :1-5. DOI: 10.1016/j.jct.2021.106424 WOS OpenAlex
Dates:
Submitted: | Nov 19, 2020 |
Accepted: | Feb 11, 2021 |
Published online: | Feb 13, 2021 |
Identifiers:
Web of science: | WOS:000644964000027 |
OpenAlex: | W3131010983 |
Citing:
DB | Citing |
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OpenAlex | 5 |