Adsorption of volatile aroma compound 2-phenylethanol from synthetic solution onto granular activated carbon in batch and continuous modes

•It were determined parameters related to the batch and continuous adsorption of the coffee aroma compound 2-phenyletahnol.•Adsorption was evaluated as an alternative separation process in order to avoid thermal treatments.•Fundamental data was obtained and will be useful for further applications of the adsorption of coffee aroma compounds.•The continuous process (column) represents the most practical application of the adsorption technique.

This paper reports a study on the adsorption of the aroma component 2-phenylethanol from an aqueous solution onto granular activated carbon, derived from coconut husks, using batch and continuous (packed-bed column) systems. In the batch mode, the contact time required to attain the adsorption equilibrium was 90 min. The adsorption isotherms were evaluated at 20.0 °C, 30.0 °C and 40.0 °C. In the continuous mode, the effects of flow rate and bed length were studied. Experimental data showed that the breakthrough and exhaustion times decreased with higher flow rates and increased with higher packed beds. The adsorption in the fixed-bed column was more efficient under the following conditions: flow rate of 3.5 mL min−1 and bed length of 11 cm. Based on the data acquired, adsorption appears to represent a promising method for the recovery of 2-phenylethanol lost during the instant coffee production process.