Process optimum and application research of starch grafting acrylonitrile to prepare the flocculating agent

The influence factors of starch grafting acrylonitrile on the grafting ratio and the grafting efficiency were researched and obtained the optimum process conditions as follows:the mass proportion of dissoluble starch to acrylonitrile is 1∶3,the concentration of ceric ammonium nitrate is 6 mg/L,grafting temperature is 35 ℃,grafting time is 2 h,under the condition,the grafting rate and grafting efficiency are 172%,92% respectively.The polymer flocculating agent prepared is better than inorganic one in the aspects of turbidity,COD removal ratio and deposition speed.