Adsorption equilibria of VOCs (n-octane, propylene glycol monomethyl ether, ethanol, and 2-propanol) on activated carbon under supercritical carbon dioxide conditions

Ikuo Ushiki, Koichi Kikuchi, Yoshiyuki Sato, Yasuyuki Ito, Shigeki Takishima, Hiroshi Inomata

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Adsorption equilibria of volatile organic compounds (VOCs: n-octane, propylene glycol monomethyl ether, ethanol, and 2-propanol) on activated carbon were measured using the fixed-bed method under supercritical carbon dioxide (scCO2) conditions at 313–353 K and 10.0–15.0 MPa. The measured adsorption isotherms strongly depended on the properties of the VOCs together with the CO2 density. The adsorption equilibria were correlated using the Dubinin–Astakhov (DA) equation with two fitting parameters: EVOC (the interaction energy between VOC and adsorbent) and W0,VOC (the saturated adsorption capacity of VOC). The fitting parameters provided insight into the adsorption phenomena of VOCs in scCO2 in terms of the CO2 density and properties of VOCs.

Original languageEnglish
Pages (from-to)59-64
Number of pages6
JournalFluid Phase Equilibria
Volume462
DOIs
Publication statusPublished - 2018 Apr 25

Keywords

  • Activated carbon
  • Adsorption equilibria
  • Dubinin–Astakhov equation
  • Supercritical carbon dioxide
  • Volatile organic compounds (VOCs)

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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