WOOD PROCESSING METHOD Russian patent published in 2019 - IPC C10L5/44 

FIELD: chemistry.

SUBSTANCE: invention describes a method of producing solid wood-based material and a material obtained from hemicellulose from wood raw material, involving: i) steam treatment or steam explosion of wood raw material to obtain a fluid component containing hemicellulose, and solid wood-based material containing steam treated wood material; wherein said method includes the following steps: a) introduction of wood raw material into high pressure vessel; b) heating the wood raw material by steam injection and maintaining temperature at 150 to 280 °C for a period of time from 60 to 2,400 seconds; c) reducing pressure at one or more steps and removing the blown wood material from the vessel; ii) separating said fluid component from said solid component; iii) treating at least a portion of said solid component to obtain a solid wood-based material; and iv) treating said liquid component to obtain material obtained from hemicellulose, including separation of fluid fraction in at least two steps: I) first step for removing suspended material; and II) second step (nano- or ultrafiltration) to increase concentration of dissolved material; where after last filtration concentration of dissolved material in filtrate is more than 10 %.

EFFECT: technical result consists in obtaining fuel from wood raw material of high quality with low content of ash.

29 cl, 3 dwg