Measurement and correlation of adsorption equilibria of propylene glycol monomethyl ether acetate on activated carbon in the presence of supercritical carbon dioxide

• Published in: Fluid phase equilibria 2020-06, Vol.513, p.112556, Article 112556
• Main Authors: Ushiki, Ikuo, Tsuji, Hiromu, Takishima, Shigeki, Ito, Yasuyuki, Sato, Yoshiyuki, Inomata, Hiroshi
• Format: Article
• Language: English
• Subjects: Activated carbon; Adsorption equilibria; Dubinin–Astakhov equation; Propylene glycol monomethyl ether acetate (PGMEA); Supercritical carbon dioxide
• ISSN: 0378-3812; 1879-0224
• DOI: 10.1016/j.fluid.2020.112556

The adsorption equilibria of propylene glycol monomethyl ether acetate (PGMEA), a major volatile organic compound (VOC) used in the semiconductor industry, on activated carbon were measured in the presence of supercritical carbon dioxide (scCO2) at temperatures from 313 K to 353 K and pressures from 10.0 MPa to 20.0 MPa. The amount of adsorbed PGMEA considerably depended on the pressure and temperature conditions in scCO2, which could be explained by the effects of CO2 density and VOC fugacity. The Dubinin–Astakhov (DA) equation has two fitting parameters, interaction energy between adsorbate and adsorbent (EVOC) and saturated adsorption capacity of VOC on adsorbent (W0,VOC), and was used to correlate the measured adsorption equilibria. Correlation by the DA equation was useful for analyzing the adsorption equilibria of PGMEA on activated carbon in scCO2 by considering the affinity of the adsorbate for the adsorbent and competitive adsorption of CO2. [Display omitted] •Adsorption equilibria of propylene glycol monomethyl ether acetate on activated carbon under supercritical CO2.•The adsorption equilibria depend strongly on physical properties of CO2 and adsorbates.•The Dubinin-Astakhov equation can be applied to the adsorption equilibria.•The model parameters provide quantitative understanding about the adsorption phenomena.