Adsorption isotherms for ethylacetate and furfural on activated carbon from supercritical carbon dioxide

Improvement of soluble coffee aroma using an integrated process of supercritical CO2 extraction with selective removal of the pungent volatiles by adsorption on activates carbon

“…This phenomenon explains the stronger bonding forces between furfural and activated carbon and as a consequence, the higher values of the removal ratio for all the experiment. The higher adsorption heat of furfural (20-32 kJ/mol) than of ethyl acetate adsorption heat (8-9 kJ/mol) corroborates this fact (Lucas et al, 2004a).…”

“…The enriched coffee oil, analyzed by GC/MS, is sprayed on soluble coffee powders to improve the quality of the soluble coffee aroma before it is packed. More details about the experimental procedure are included in previous work (Lucas et al, 2004a).…”

“…On the other hand, furfural is an undesirable volatile compound with a pungent or foul smell. Lucas et al (2004a) reported adsorption equilibrium data for both compounds.…”

Adsorption equilibrium of citric acid from supercritical carbon dioxide/ethanol on cyano column

“…Only a few researches have been reported on adsorption isotherms from supercritical fluid. The adsorption equilibrium of some solutes, such as benzoic acid and acetylsalicylic acid [11], salicylic acid [12], ethyl benzene [13], toluene and ethyl acetate [14,15], α-tocopherol and δ-tocopherol [16,17], terpene [18,19], furfural [20], eicosane and 1,2-hexanediol [21] etc, from sc-CO 2 have been studied. However, because of the complex nature of adsorbent-adsorbate interactions, it is hard to theoretically predict adsorption isotherms.…”

Adsorption onto Granular Activated Carbon (GAC) as an Emerging Technology for the Recovery of Aroma Compounds in the Fruit Juice Industry

“…In Figure 1 the flow diagram of the conventional process of concentrated pear juice is shown together with the proposed alternative. Rectification entails high energy costs, and other technologies, like adsorption onto activated carbon (Edris et al, 2003;Lucas et al, 2004), have been proposed as alternative for the aroma recovery to those thermal treatments in order to improve the quality of the aroma obtained from the natural fruit source and also to decrease the energy costs associated to thermal processes. In the work published by Karlsson and Trägårdh (1997), activated carbons were recognised as the best adsorbent materials, adsorbing more than 86% of the aroma.…”