METHOD OF PROCESSING OAK-WOOD USED DURING RIPENING OF BRANDY AND THE LIKE ALCOHOLS Russian patent published in 2007 - IPC C12H1/22 C12H1/16 C12G3/07 

FIELD: wine industry.

SUBSTANCE: oak-wood in the form of rivets or rods is exposed to ultrasonic vibrations and then heated. Ultrasonic vibration action is effected along wood fibers in quasi-pulse mode taking into consideration acoustic resistance of wood to prevent its inflammation during prolonged processing at frequency 16 to 100 kHz and intensity 0.5 to 20 W/cm², total processing time ranging from 16 to 1800 sec, quasi-pulse action time 5-7 sec, and relaxation time 3-5 sec. Heating of wood at 125-210°C is effected for 0.3-2.0 h, at 125-150°C for 1.5-2.0 h, at 170-190°C for 0,5-1,0 h, and at 200-210°C for 20-30 min. Invention assures most effective transfer of vibrations into wood and more full cleavage of high-molecular weight compound into simpler monomer components.

EFFECT: increased recovery of alcohol-soluble phenol substances and lignin fractions.

8 cl, 6 ex