【摘要】 <正>引言混凝沉降法作为提高水质处理效率的一种经济、简便的方法备受关注,而混凝处理过程中,混凝剂的种类、性质是混凝处理效果好坏的关键因素。其中有机高分子混凝剂更是成为近年来的研究热点[1-4]。聚丙烯酰胺作为一种高效的有机高分子混凝剂,具有正电荷密度高、相对分子质更多还原

【Abstract】 A preparation method for high molecular weight cationic polyacrylamide(CPAM) is reported in this paper.CPAM was prepared by using high purity industrial grade acrylamide with acryloyloxyethyltrimethyl ammonium chloride through aqueous copolymerization initiated by VA-O44.The initiator was added all at once and reaction temperature was increased stepwise to complete the polymerization gradually.The effects of reaction variables,such as temperature,reaction time,concentration of monomer and ratio of monomer on the molecular weight of product CPAM were investigated in detail.The optimum conditions were as follows: initial temperature 39℃,reaction time 5 h,monomer concentration 30% and monomer ratio of acrylamide(AM): acryloyloxyethyl trimethyl ammonium chloride(DAC) 2.3∶1.In addition,the maximum molecular weight of obtained product CPAM reached 10210000.The structure of product was characterized by FTIR.And the coagulation/flocculation process was carried out for treatment,of water containing dimethyl phthalate.The removal rate was compared with polymeric aluminum chloride(PAC),polymeric ferric sulfate(PFS),poly diallyl dimethyl ammonium chloride(PDMDAAC) and industry CPAM.During the coagulation/flocculation process,parameters,such as coagulant dosage,pH value,stirring time,and settling time were investigated.The results showed the organic coagulant PDMDAAC,industrial CPAM and self-made CPAM had better coagulation effects than inorganic coagulant PAC and PFS,and the self-made CPAM had the best coagulation effects,with an initial DMP concentration of 0.50 mg·L-1,the addition of a self-made CPAM dosage of 12.5 mg·L-1 and the best removal rate of DMP was 97.3%.更多还原