Effect of mechanisms of discrete-pulse energy input on the physico-chemical indicators of oak extracts

Abstract

One of the most important stages in the creation of a number of spirits is aging. The aim of the work is to study the effect of discrete-pulse energy input on the physicochemical parameters of oak extracts. It was determined that it is most effective to process oak chips in a rotor-pulsation apparatus with a flow shear rate of 50? 103 s-1 and a duration of 11 hours and an extractant strength of 60% by volume. An increase in the extraction temperature from 25 to 40?? contributes to an increase in the optical density of solutions from 0.64 to 0.78 units, while energy consumption does not increase. It was determined that when the solid/liquid ratio decreases from 1:10 to 1:20, the content of tannins in the extract decreases almost twice. The dependence of the change in the average surface diameter of oak particles on the processing duration in the rotor-pulsation apparatus was determined at a flow shear rate of 50? 103 s-1, a solid/liquid ratio of 1:10, a temperature of 40??, and an ethanol concentration of 60% vol. The most intensive dispersion took place in the first two hours. The particle size decreased by more than 2000 ?m. After 4 hours of processing, the reduction was 150 ?m, and after 6 hours - 100 ?m. Further processing from 6 to 12 hours led to a decrease in the size of the particles by 50 ?m. The maximum concentration of tannins was 7.4 g/L with an average particle size of 400 ?m, which corresponds to 10-12 hours of processing.