Abstract:

An aqueous two-phase polymerization of acrylamide(AM) with 2-(acryloyloxy)ethyl trimethylammonium chloride(DAC) was carried out using polyethylene glycol(PEG) as dispersant and ammonium persulfate as the initiator. A series of cationic polyacrylamide(CPAM) flocculants was prepared. Effects of the ratio of monomers on the relative molecular mass, monomer conversion and cationic degree were studied. The CPAM was used as flocculating agent for the Yellow River water. The influence of the dosage of CPAM, the pH value of water sample, the stirring speed, the mixing and standing time on the flocculating performance were studied. The results shows that the cationic degree of CPAM increases with the decrease of m(AM)/m(CAD), while the relative molecular mass and conversion slightly decrease. The flocculating efficiency depends on the dosage of CPAM, the pH, stirring speed, and the stirring and standing time. The removal rate of the impurities in the water samples is 92% under the optimum conditions:pH=6, stirring speed 100 r/min, stirring time 15 min, standing time 10 min, CPAM 0.3 mg/L.

Key words: aqueous two-phase polymerization, acrylamide, cationic monomer, flocculating performance