METHOD FOR WOOD ACETYLATION AND ACETYLATED WOOD Russian patent published in 2017 - IPC B27K5/00 

FIELD: woodworking industry.

SUBSTANCE: wood with a moisture content of less than 5% by weight is placed in a vessel and immersed in the acetylating liquid at a temperature from 10 to 120 °C. The acetylating fluid contains acetic anhydride and/or acetic acid. The pressure in the vessel is increased to 2-20 bar for a period from 1 to 300 minutes. The acetylating liquid excess is removed from the vessel. An inert fluid is introduced into the vessel. The fluid circulation and heating are carried out till exothermic temperature rise starts inside the lumber. The heat supply to the wood is regulated until the exothermic process is complete. The temperature inside the lumber is maintained below 180°C. The circulating fluid is heated to a temperature from 85 to 160°C within from 10 to 120 min in order to initiate the second exothermic process. The heat supply to the wood is regulated until the exothermic process is complete. The temperature inside the lumber is maintained below 180°C. The circulating fluid is removed by evaporation in vacuo.

EFFECT: increasing the wood strength.

15 cl, 1 tbl