Solubility of individual polychlorinated biphenyl (PCB) congeners in supercritical fluids: CO2, CO2/MeOH and CO2/n-C4H10

G. Anitescu, L. L. Tavlarides

Research output: Contribution to journalArticle

40 Scopus citations

Abstract

The solubilities of nine individual polychlorinated biphenyl (PCB) congeners 2-chlorobiphenyl, 4-chlorobiphenyl, 2,2′-dichlorobiphenyl, 4,4′-dichlorobiphenyl, 2,4′,5-trichlorobiphenyl, 3,3′,4,4′-tetrachlorobiphenyl, 2,2′,4,5,5′-pentachlorobiphenyl, 2,2′,4,4′,5,5′-hexachlorobiphenyl, and 2,2′,3,4,4′,5,5′-heptachlorobiphenyl in supercritical carbon dioxide and in supercritical carbon dioxide modified by n-butane (n-C4H10) and methanol (0.05 mole fractions on a solute-free basis) are presented. The concentrations of the PCB/hexane solutions are analyzed by capillary gas chromatography with an electron capture detector (GC/ECD). Solubility isotherms at 313, 323, and 333 K for each PCB congener have been determined over a pressure range of 100-300 bar. The solubility data (expressed as mole fractions) are correlated by a semi-empirical equation to link the solubility to the thermodynamic properties of solvent such as reduced density, solute vapor pressure, reduced temperature and reduced pressure of the system. Both n-butane and methanol were found to increase the solubility over the case of pure carbon dioxide of all PCB congeners studied (higher in CO2/n-C4H10 fluids).

Original languageEnglish (US)
Pages (from-to)197-211
Number of pages15
JournalJournal of Supercritical Fluids
Volume14
Issue number3
DOIs
StatePublished - Jan 1 1999

Keywords

  • CO
  • Capillary GC analysis
  • Equilibrium solubility
  • Methanol
  • PCB congeners
  • Supercritical fluid
  • n-Butane

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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