LIQUID-GAS PARTITION-COEFFICIENTS OF AROMA COMPOUNDS AND N-ALKANES BETWEEN AQUEOUS-ETHANOL MIXTURES AND NITROGEN

Equilibrium liquid/gas partition coefficients between aqueous ethanol solutions and nitrogen were measured using a cocurrent gas/liquid equi librium column for n-alkanes (pentane to hexadecane) and 13 different aroma compounds at very dilute concentrations. The operation of the co lumn is described, and the results are compared to available literatur e results. The partition coefficients are compared to estimations made using the UNIFAC and GCFLORY (group-contribution Flory equation of st ate) activity coefficient estimation models. The estimations are gener ally accurate within an order of magnitude, with some exceptions.