Supercritical CO sub 2 extraction of organic contaminants from aqueous streams

Journal Article · Sat Jun 01 04:00:00 EDT 1991 · A.I.Ch.E. Journal (American Institute of Chemical Engineers); (United States)

DOI:https://doi.org/10.1002/aic.690370617· OSTI ID:5710946

Ghonasgi, D; Gupta, S; Dooley, K M; Knopf, F C ^[1]

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1. Dept. of Chemical Engineering, Louisiana State Univ., Baton Rouge, LA (US)

This paper reports on supercritical fluid extraction (SCFE) for the removal of organic toxins from water which has been studied using a continuous-flow view cell system. Distribution coefficients (ratio of mole fraction of contaminant in supercritical CO{sub 2} to mole fraction in the aqueous phase at equilibrium) have been determined for a homologous series of contaminants as individual components in pure water: benzene, phenol, p-chlorophenol, and m-cresol. Data were obtained at two temperatures (313 and 323 K) and over a pressure range of 9.65 to 17.23 MPa for each contaminant. The distribution coefficients of the contaminants follow a pattern that can be explained in terms of molecular interactions both with water in the aqueous phase (as quantified by the pure contaminant solubility in water) and with CO{sub 2} in the SCF phase (as quantified by the pure contaminant solubility in near-critical CO{sub 2} and crossover phenomena in SCF CO{sub 2}). These results have been accurately modeled using a hardsphere, perturbation-theory-based Carnahan-Starling-DeSantis-Redlich-Kwong equation of state and simple van der Waals mixing rules.

• OSTI ID: 5710946
• Journal Information: A.I.Ch.E. Journal (American Institute of Chemical Engineers); (United States), Journal Name: A.I.Ch.E. Journal (American Institute of Chemical Engineers); (United States) Vol. 37:6; ISSN AICEA; ISSN 0001-1541
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400105* -- Separation Procedures
400201 -- Chemical & Physicochemical Properties
54 ENVIRONMENTAL SCIENCES
540320 -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (1990-)
540350 -- Environment
Aquatic-- Site Resource & Use Studies-- (1990-)
AQUEOUS SOLUTIONS
AROMATICS
BENZENE
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL WASTES
CONTROL
CRESOLS
DISPERSIONS
EQUATIONS
EQUATIONS OF STATE
EXTRACTION
HYDROCARBONS
HYDROXY COMPOUNDS
MIXTURES
NONRADIOACTIVE WASTES
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHENOL
PHENOLS
POLLUTION CONTROL
REMEDIAL ACTION
SEPARATION PROCESSES
SOLUTIONS
SOLVENT EXTRACTION
SUPERCRITICAL GAS EXTRACTION
VAN DER WAALS FORCES
WASTES
WATER POLLUTION CONTROL
WATER TREATMENT PLANTS