Synthesis and Research on Citric Acid Polycarboxylic Dispersant of Coal Water Slurry

With citric acid, acrylic acid, polyethylene glycol as raw materials, the direct esterification method was applied to synthetize the molecule monomer. Takin g water as the solvent, taking esterification monomer, sodium p-styrene sulfonate, acrylic acid, allyl polyethylene glycol as the copolymerization monomer, the freeradic al polymerization was applied to prepare a new citric acid polycarboxylic dispersant of coal water slurry.The paper had a discussion on the polymerization condition of t he dispersant influenced to the performances and had a property analysis on the dispersant.The results showed that when the mixing ratio of esterification monomer, ac rylic acid, sodium p-styrene sulfonate, allyl polyethylene glycol was 2 :4: 1 : 1 individually, the dosage of the initiator was 2% of the monomer quantity and the polymeri zation temperature was 75。C, the performances of the dispersant would be best.With the dispersant, when the added quantity was 0.3%, the quality fraction of the coal water slurry was 64% and the viscosity of the coal water slurry was 626 mPa's, the dispersant would have high dispersion performances.