Adsorption of aliphatic, alicyclic, and aromatic hydrocarbons on poly(ethylvinylbenzene-divinylbenzene) adsorbent at from effective zero to finite adsorbate surface coverage

Journal Article · Sun Jun 01 00:00:00 EDT 1986 · Anal. Chem.; (United States)

DOI:https://doi.org/10.1021/ac00298a028· OSTI ID:5630393

Djordjevic, N M; Laub, R J; Kopecni, M M; Milonjic, S K

The solid/gas partition coefficients, K/sub s/, and related thermodynamic properties of a number of hydrocarbon adsorbates at effective zero surface coverage on commercial samples of the title adsorbent, Porapak Q, were measured over the temperature range 293-443 K. The enthalpies of adsorption derived from the averaged absolute K/sub s/ gave incremental ..delta..H/sub s//sup 0/ of -7.5 kJ mol/sup -1/ for aliphatic and alicyclic -CH/sub 2/-, as well as aromatic -CH=, and -12 kJ mol/sup -1/ for -CH/sub 3/, while the differential entropies calculated in terms of translational motions were found to predict correctly the trends observed in the experimental ..delta..S/sub s//sup 0/. The technique of elution by characteristic point (ECP) was then used to derive the finite concentration adsorption isotherms and isosteric heats of adsorption of n-hexane, n-heptane, cyclohexane, benzene, carbon tetrachloride, and acetone at fractional adsorbate pressures, p/p/sup 0/, of no greater than 10/sup -2/ on a particular sample of the title absorbent at 20/sup 0/ intervals over the temperature range 413-493 K.

• Research Organization: San Diego State Univ., CA
• OSTI ID: 5630393
• Journal Information: Anal. Chem.; (United States), Vol. 58:7
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
COPOLYMERS
SORPTIVE PROPERTIES
THERMODYNAMIC PROPERTIES
HYDROCARBONS
ADSORPTION
STYRENE
ADSORPTION ISOTHERMS
ELUTRIATION
EXPERIMENTAL DATA
GASES
MEDIUM TEMPERATURE
PARTITION FUNCTIONS
SOLIDS
THERMODYNAMICS
ALKYLATED AROMATICS
AROMATICS
DATA
FLUIDS
FUNCTIONS
INFORMATION
ISOTHERMS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PHYSICAL PROPERTIES
POLYMERS
SEPARATION PROCESSES
SORPTION
SURFACE PROPERTIES
400105* - Separation Procedures
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