Abstract
We extracted the lignin by ethanol method,with the residues of Acanthopanax root and stem as raw materials. By single factor and orthogonal experiments,the optimum of ethanol lignin hydroxymethylation alkali dose of 2. 0%,reaction temperature of 80℃,reaction time of 3. 5 h,and mass ratio of kraft lignin to formaldehyde of 3 ∶ 1. The modified lignin reached 11. 56% hydroxymethyl groups and 0. 257% free formaldehyde.
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