Abstract
Methyl ethyl ketone (MEK) and methyl isobutyl ketone (MIBK) are volatile organic compounds (VOCs) employed in significant quantities in the printing industry. This study investigates the adsorption equilibria of MEK and MIBK on activated carbon (specific surface area: 1300 m2/g) in supercritical CO2 at P = (10−20) MPa and T = (313−353) K. The amount of MIBK adsorbed on activated carbon was larger than that on MEK, which is attributed to the difference in the individual affinities of each compound for activated carbon and to the difference in their volatility with the supercritical fluid. The Dubinin–Astakhov (DA) equation was used to correlate the experimental results, where the average relative deviation was approximately 3.8 %. Furthermore, the fitted parameters acquired from the calculations were dependent on the CO2 density and VOC properties, which provides a deeper understanding of their roles in the adsorption process.
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