Supercritical fluid desorption from activated carbon

✍ Scribed by M.P. Srinivasan; J.M. Smith; B.J. McCoy

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 956 KB
• Volume: 45
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(90)87064-y

✦ Synopsis

Experimental data and mathematical models are presented for desorption of ethyl acetate from activated carbon with supercritical carbon dioxide as solvent. The effluent concentration was monitored continuously with a flame ionization detector (FID). With a well-mixed reactor model for the bed of smah thickness, desorption was studied as a function of flow rate, pressure, temperature and particle size. External mass transfer resistance was apparent at very low flow rates. From studies on the effect of temperature at different pressures, a cross-over effect was observed, similar to that for solubility in supercritical solvents. Intraparticle diffusion resistance was found to be significant for the largest particle size studied (dia. = 3.15 mm). A first-order, reversible adsorption model successfully fitted the experimental data. The energies of activation and heats of adsorption were obtained from the optimized adsorption rates and equilibrium constants.