METHOD OF INTEGRATED PROCESSING OF LARCH WOOD TO RECOVER NATURAL PRODUCTS IN NATIVE STATE Russian patent published in 2005 - IPC

FIELD: resin industry.

SUBSTANCE: invention relates to processing of lignin-carbohydrate raw material, in particular larch wood, comprising reducing larch waste, contacting it with solvents, heating resulting mixture, extraction under conditions wherein components of the mixture are present in fluidized state, and recovering desired products from organic and aqueous phases. All stages are accomplished in oxygen-free atmosphere. Extraction is carried out in three steps. In the first step, wood structure in larch wood is destroyed to open fibrillar cavities, while affecting these for 3-5 min with water-hydrocarbon emulsion (n-hexane and deionized water) in the rotary-pulsating apparatuses providing fluidized state of solvent to isolate native resins, oils, and mineral salts. In the second step, dry deresined raw material is treated with absolute alcohol to recover bioflavonoids and then, in the third step, remaining dry raw material is treated with deionized water to recover carbohydrate-lignin activated biopolymer and arabinogalactane. In extraction steps 1-3, ratios of solid phase of raw material to liquid phase of reagent are the following: 1:(5-6), 1:(2.5-3), and 1:(3-3.5), respectively. In all extraction steps, separation of liquid extracts from solid extracted mass is carried out under vacuum-pulse conditions within positive temperature range below 38°C at residual pressure 0.1-5 mm Hg, performing fast vacuum development, keeping extraction mass in vacuum, rapidly releasing vacuum in an impact manner into inert medium and restoring atmospheric pressure, repeating described cycle not more that thrice.

EFFECT: significantly reduced process cycle times, decreased consumption of regents, simplified technology, decreased process wastes, and increased output of recovered products.

2 cl, 1 dwg, 2 ex