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

作者：Ushiki Ikuo^*; Kikuchi Koichi; Sato Yoshiyuki; Ito Yasuyuki; Takishima Shigeki; Inomata Hiroshi^*

来源：Fluid Phase Equilibria, 2018, 462: 59-64.

DOI：10.1016/j.fluid.2018.01.027

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

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 (scCO(2)) 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: E-VOC (the interaction energy between VOC and adsorbent) and W-0.VOC (the saturated adsorption capacity of VOC). The fitting parameters provided insight into the adsorption phenomena of VOCs in scCO(2) in terms of the CO2 density and properties of VOCs.

• 出版日期2018-4-25