高取代度阳离子变性淀粉絮凝剂制备与应用

Preparation and Application of Cationic Starch Flocculant with High Substituted Degree

以马铃薯淀粉为原料,3-氯-2-羟丙基三甲基氯化铵为阳离子醚化剂,采用预干燥干法制备出取代度为0.390 3的高取代度阳离子变性淀粉絮凝剂,并将其与聚合硫酸铁复配使用。通过正交试验优化出最佳絮凝工艺:阳离子淀粉质量分数为0.15%、聚合硫酸铁质量分数为0.15%,废液初始pH值为7.0。经过絮凝处理的马铃薯淀粉生产废液的化学需氧量去除率(COD)为64.31%。

The quaternary amino groups containing cationic starch with the degree of substitution 0.390 3 was prepared via the reaction of potato starch with 3-chloro-2-hydroxypropyl-trimethyl ammonium chloride using pre-drying dry process.Then the cationic starch（CS） and poly ferric sulfate（PFS） would be used to treat potato starch waste water.And the cleaning efficiency of the chemical oxygen demand（COD） in the wastewater was studied by changing the experiment conditions.Though the orthogonal test,the optimal conditions were as follows： CS addition 0.15%,PFS addition 0.15%,initial reaction pH 7.0.The removal rate of COD was 64.31%.