Batch experiments of pervaporation involved in the partial dealcoholization of Malbec wine

Abstract

Pervaporation experiments of binary ethanol-water mixtures with a PDMS membrane were accomplished by duplicate. In each experiment, an initial solution of 550 g with ethanol mass fractions of 0.084 and 0.117 was employed. Under a permeate pressure of 0.013 bar, three permeate samples were collected at intervals of 25, 35, 40, and 60 minutes, corresponding to operating temperatures of 30, 35, 40 and 45 °C, respectively. Partial dealcoholization experiments at lab scale were run with the pervaporation setup (28 cm2) operated at a permeate pressure of 0.013 bar and at three different temperatures; i.e. 35, 40 and 45°C. In all cases, the feed to the process consisted of 550 g of a Malbec wine with an alcohol content of 14.8% v/v. Two types of runs were carried out: i) simple runs to build a conceptual model of the process and ii) repetitions to accumulate an adequate volume of partially dealcoholized wine (10.5% v/v).