Grape pomace extraction efficiency investigation in subcritical water environment

Abstract

The article presents the dry matter yield experimental studies results in the subcritical water grape pomace extraction of. Extraction was performed under a temperature range of T 100°C ÷ 160°C, pressure P = 12 MPa, exposure of 30 to 90 min and hydronic modules 1:5 and 1:10. High output common extractives were observed already at 100°C and 0.5 h (31.9 % at hydro module 1:5 and 39.4 % at hydronic module 1:10). The results showed that extraction with subcritical water of a dry extract yield at least 2 times greater than the sweet pomace by washing with hot water. Subcritical water extraction at 160°C for conversion of plant material is comparable to wood acid hydrolysis. However, compared with a catalytic hydrolysis sulfuric acid unnecessary neutralization of with the illiquid formation, hard recyclables departing - gypsum contaminated with organic compounds.