Adsorption of aliphatic, alicyclic, and aromatic hydrocarbons on poly(ethylvinylbenzene-divinylbenzene) adsorbent at from effective zero to finite adsorbate surface coverage
Journal Article
·
· Anal. Chem.; (United States)
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), Journal Name: Anal. Chem.; (United States) Vol. 58:7; ISSN ANCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400105* -- Separation Procedures
400301 -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ADSORPTION
ADSORPTION ISOTHERMS
ALKYLATED AROMATICS
AROMATICS
COPOLYMERS
DATA
ELUTRIATION
EXPERIMENTAL DATA
FLUIDS
FUNCTIONS
GASES
HYDROCARBONS
INFORMATION
ISOTHERMS
MEDIUM TEMPERATURE
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PARTITION FUNCTIONS
PHYSICAL PROPERTIES
POLYMERS
SEPARATION PROCESSES
SOLIDS
SORPTION
SORPTIVE PROPERTIES
STYRENE
SURFACE PROPERTIES
THERMODYNAMIC PROPERTIES
THERMODYNAMICS
400105* -- Separation Procedures
400301 -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ADSORPTION
ADSORPTION ISOTHERMS
ALKYLATED AROMATICS
AROMATICS
COPOLYMERS
DATA
ELUTRIATION
EXPERIMENTAL DATA
FLUIDS
FUNCTIONS
GASES
HYDROCARBONS
INFORMATION
ISOTHERMS
MEDIUM TEMPERATURE
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PARTITION FUNCTIONS
PHYSICAL PROPERTIES
POLYMERS
SEPARATION PROCESSES
SOLIDS
SORPTION
SORPTIVE PROPERTIES
STYRENE
SURFACE PROPERTIES
THERMODYNAMIC PROPERTIES
THERMODYNAMICS