Preparation of sphere trimethyl quaternary ammonium salt based on lignin and study on its flocculation performance

Sphere trimethyl quaternary ammonium salt based on lignin was prepared by reversed phase suspension polymerization technique with trimethyl quaternary ammonium salt based on lignin as raw material, and the dispersing agent was Span 60. Its structure was determined by Laser Particle Sizer, scanning electron microscopy (SEM) and Fourier transform infrared spectrometry (FTIR). The effects of sphere trimethyl quaternary ammonium salt based on lignin on the flocculation performance of acid dyes were investigated with acid black ATT water as the simulate dye.The results showed that the optimum conditions obtained by orthogonal experiments were Span 60 dosage 2.5%, reaction time 1 hour, stirring speed 100 r/min, formaldehyde dosage 11%. The average particle size of the product was 0.161 mm.The decolonization rate of sphere trimethyl quaternary ammonium salt based on lignin was 94.09% at pH of 1-2, while trimethyl quaternary ammonium salt based on lignin was 78.82% at pH of 3-4; when the acid black ATT was 0.1 g/L, the best dosage of sphere trimethyl quaternary ammonium salt based on lignin was 0.1 g, while the trimethyl quaternary ammonium salt based on lignin was 0.3 g.