DISSOLUTION OF WOOD IN THE IMIDAZOLIUM IONIC LIQUIDS
Abstract
Dynamics of dissolution of fir-tree wood in ionic liquids acetate 1-buthyl-3-methylimidazolium and chloride 1-buthyl-3-methylimidazolium in the range of temperatures from 80 to 160 °C has been studied. It was established that acetate 1-buthyl-3-methylimidazolium possesses the best dissolving ability in relation to wood, than chloride 1-buthyl-3-methylimidazolium, at temperatures of 80–135 °C. Above 160 °C fir-tree wood was almost completely dissolved in acetate 1-buthyl-3-methyl-imidazolium, however dissolution of wood at this temperature leads to destruction of its components. From the solution received by wood processing by acetate 1-buthyl-3-methylimidazolium at 120 °C within 2 hours lignin and carbohydrate fractions were allocated selectively. IR spectrums of the regenerated samples were similar to the corresponding wood components. The analysis of polymolecular properties of lignin regenerated from solution has shown that there was no any polymer destruction under these conditions. Molecular mass and polydispersion degree were closed to the dioxanlignin allocated from wood by dioxane extraction in soft conditions.Downloads
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