| 摘要 |
woodworking industry. SUBSTANCE: destructurized groundwood is subjected to two-step fluidized-state extraction using, as first-step extractant, aqueous emulsion of nonpolar aliphatic hydrocarbon and, as second-step extractant, aqueous emulsion of low-boiling ether and ethyl alcohol. Extracts are processed to isolate natural resins, oligosaccharides, and native bioflavonoids (dihidroquercetin and dihydrokaempferol). Solid phase constituting carbon-containing wood polymer is isolated as commercial product and/or subjected to carbonization to produce activated carbon form. Isolation of bioflavonoids from dry extract obtained from alcohol-ether phase is performed with aqueous acetone solvent to give solution, which is subjected to vacuum distillation followed by recrystallization of bioflavonoids from water. EFFECT: reduced process time, reduced consumption of organic solvents and steel intensity, and simplified technology. 16 cl, 1 dwg, 5 tbl, 3 ex |
