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[Preparation method] The active hydroxyl group of lignin can be used to synthesize Mannich base through Mannich reaction, and then further modified by alkylation to generate quaternary ammonium salt with positive charge .
(3) Example 3
Using lignin as raw material, Mannich reaction was used to insert ammonium salt groups on the lignin skeleton, and then alkylation was used to prepare quaternary ammonium salt cationic flocculant
(4) Example 4
① Use a solvent to dissolve lignin.
[Application]Mckague reported that sulfate lignin undergoes Mannich reaction, reacts with dimethylamine and formaldehyde, and undergoes methylation and chloromethylation.