摘要
为实现腈纶废料的回收利用,降低产品的生产成本,将废腈纶水解后,通过Mannich反应制得具有两性结构的聚丙烯酰胺。考察了反应条件对产物胺化度的影响,用红外光谱对产品结构进行了分析,研究了不同胺化度产品的絮凝性能。结果表明,反应时间和原料配比对产品的胺化度有较大影响。胺化度约为30%的产品在用量为7 mg/L,pH值近中性时对硅藻土悬浮液的除浊率可达95%;与聚合氯化铝配合使用时,对实际印染废水的脱色及COD去除效果均明显优于工业聚丙烯酰胺(PAM),COD去除率可达85%。
The present paper is to introduce the author＇s method for preparing an amphoteric polyacrylamide flocculation agent by Mannich reaction of the hydrolysate of waste polyacrylonitrile with dimethylamine and formaldehyde.For this purpose,we have investigated various factors that may influence the reaction process and the amination degree of the product,such as the reaction temperature,reaction time duration and the dosage of dimethylamine and formaldehyde.In addition,we have also discussed the flocculation properties of the products with different amination degrees as well as the structure of the flocculation agent by IR spectrum.The results of investigation indicate that the reaction time and the ratios of materials can be taken as the two main factors influencing the product amination degree.We have also found that cyano in polyacrylonitrile was almost entirely hydrolyzed and turned into amide and carboxyl and anion group with some cations included in the product by the way of IR.The product whose amination degree was about 30%,intrinsic viscosity was about 800 mL/g and molecular weight was about 3.5×106 had a removal ratio of turbidity more than 95% on flocculating diatomite suspension when dosage of flocculant agent is 7 mg/L,pH value is about 7 in flocculation experiment.The flocculating efficiency is proved better than PAM when the flocculation agent is used to treat true original wastewater containing dye from wool factory cooperating PAC with quality ratio 1 to 2 and its dosage being 10 mg/L.The transmittance of the water samples tends to be twice improved while the decreasing ratio of COD could reach 85%.
出处
《安全与环境学报》
CAS
CSCD
2008年第5期16-18,共3页
Journal of Safety and Environment
关键词
化学纤维工业
废腈纶
两性高分子絮凝剂
胺化度
chemical fiber industry, waste polyacrylonitrile, amphoteric polymeric flocculant, amination degree
