Premium
Sorption of N ‐butane, propane, and ethane in ethylcellulose
Author(s) -
Casur Ertugrul,
Smith Theodore G.
Publication year - 1986
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1986.070310526
Subject(s) - sorption , butane , propane , chemistry , langmuir , henry's law , thermodynamics , hydrocarbon , organic chemistry , adsorption , aqueous solution , physics , catalysis
The sorption of n ‐butane, propane, and ethane in ethylcellulose has been investigated between 0 and 200 mm Hg pressure over the temperature range from 30 to 70°C. Sorption isotherms of n ‐butane, propane, and ethane in ethylcellulose suggest that both Henry's law and the Langmuir forms of sorption, are operative. Sorption data were analyzed using the dual sorption model and sorption parameters determined. The sorption attributed to the Langmuir mode decreases as the temperature increases. This result indicates that the nonlinear Langmuir mode of sorption is more characteristic of the glassy state than sorption represented by the Henry's law mode. It was found that sorption attributed to the Henry's law and Langmuir modes decreases as the molecular size of gaseous hydrocarbon penetrants decrease. In this study, the molecular size of gaseous molecule decreased as the gases studied changed from n ‐butane to propane to ethane. A correlation of the Henry's law constants for the solution of n ‐butane, propane, and ethane in ethylcellulose with the Lennard‐Jones force constants, ϵ/ k at different temperatures was also determined. The temperature dependence of the Henry's law constants were correlated by a van't Hoff relationship and heats of sorption determined.