METHOD OF PREPARING CRYSTALLINE OAK EXTRACT Russian patent published in 1998 - IPC

FIELD: wine production. SUBSTANCE: preparation of crystalline oak extract with high organoleptic characteristics includes following operations. Oak stump is sawed into blanks which are then chopped in fiber direction and stored for 6 to 18 months. When 20% moisture content is attained, blanks are debarked and disintegrated into chips in two steps. Chips are divided into two portions, each being then subjected to heat treatment at specified temperature and time values. Thereafter, chips are flooded with hot water and extracted under pressure in a set of diffusers, diffusion liquor is picked out, evaporated, concentrated, and dried to 6-8% moisture. According to invention, thermally treated chip portions, prior to be flooded with hot water, are combined or extracted separately and diffusion liquors then combined. EFFECT: optimized sequence of operations. 3 cl