Supercritical fluid regeneration of activated carbon loaded with heavy molecular weight organics

Journal Article · Tue Jun 01 04:00:00 EDT 1993 · Industrial and Engineering Chemistry Research; (United States)

DOI:https://doi.org/10.1021/ie00018a022· OSTI ID:6202348

Madras, G; Erkey, C; Akgerman, A ^[1]

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1. Texas A and M Univ., College Station (United States). Chemical Engineering Department

The adsorption isotherms of naphthalene, phenanthrene, hexachlorobenzene, and pentachlorophenol on activated carbon in the presence of supercritical carbon dioxide were determined at 308 and 318 K and at pressures around 100 atm using an experimental technique based on frontal analysis chromatography. The isotherms were modeled by the Freundlich equation, and the heats of adsorption of these organics on carbon were extracted from the temperature dependency of the initial slopes of the isotherms. The heats of adsorption were found to be in the range 4-8 kcal/mol. The amount of organic adsorbed on carbon was found to be independent of the nature of organic. The desorption of these organics from activated carbon with supercritical carbon dioxide was also investigated in the same temperature and pressure ranges and, were modeled successfully by the local equilibrium theory. The extremely long tails observed in the desorption profiles can be attributed to the steepness of the initial slopes of the adsorption isotherms which limit the concentration of the organic in the fluid phase to an extremely small value.

• OSTI ID: 6202348
• Journal Information: Industrial and Engineering Chemistry Research; (United States), Journal Name: Industrial and Engineering Chemistry Research; (United States) Vol. 32:6; ISSN IECRED; ISSN 0888-5885
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400105* -- Separation Procedures
ACTIVATED CARBON
ADSORBENTS
ADSORPTION HEAT
ADSORPTION ISOTHERMS
AROMATICS
CARBON
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHLORINATED AROMATIC HYDROCARBONS
CHROMATOGRAPHY
CONDENSED AROMATICS
DATA
DESORPTION
ELEMENTS
ENTHALPY
EXPERIMENTAL DATA
HALOGENATED AROMATIC HYDROCARBONS
HYDROCARBONS
HYDROXY COMPOUNDS
INFORMATION
ISOTHERMS
MATHEMATICAL MODELS
MEDIUM PRESSURE
NAPHTHALENE
NONMETALS
NUMERICAL DATA
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHENANTHRENE
PHENOLS
PHYSICAL PROPERTIES
REGENERATION
SEPARATION PROCESSES
SORPTION
SUPERCRITICAL FLUID CHROMATOGRAPHY
SUPERCRITICAL STATE
TEMPERATURE RANGE
TEMPERATURE RANGE 0273-0400 K
THERMODYNAMIC PROPERTIES