Studies on a cationically modified quaternary ammonium salt of lignin

A new quaternary ammonium salt monomer was synthesized and a quaternary amination of lignin(noted as QL), with the monomer was carried out by grafting copolymerization. The products were characterized by Fourier Transform Infrared spectroscopy(MR). The experimental results indicate that the yield of the monomer was 99.06%, and the conversion of the monomer and the grafting yield of QL were 93.69% and 185.78%, respectively. The feasibility of QL as the flocculant to be applied in color removal of five artificial dyes, eriochrome black T(dye A), gongo red(dye B), direct fast black G (dye C), cuprofix blue green B (dye D), and acid black ATT (dye E) was examined. Results show that QL exhibits the favorable flocculation performance and high stability.