FIELD: chemistry of high-molecular compounds, wood chemistry.
SUBSTANCE: invention relates to a method for preparing water-soluble lignin representing a biopolymer of polyphenol structure and vegetable origin. Method for preparing water-soluble lignin involves treatment of the lignin-containing raw with alkali solution, and water-soluble lignin is prepared by decationization. Dioxane-lignin is used as raw prepared from lignin-containing natural vegetable material. Raw is treated with alkali at the room temperature (15-25°C) up to the complete dissolving and water-soluble lignin is prepared by infusion of lignin alkaline solution with cation-exchange resin up to pH = 7 followed by filtration. Invention provides enhancing the solubility of lignin, preparing lignin natural preparations showing the most relation to native lignin by chemical structure, and expanding a branch of their using.
EFFECT: improved preparing method.
7 ex
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