两性离子型聚合物絮凝剂的制备及性能评价

Preparation and performance evaluation of zwitterionic polymer flocculant

海上油田含油污水具有矿化度高、成分复杂以及稳定性强的特点,使用常规的聚丙烯酰胺类絮凝剂处理效果较差,以丙烯酰胺(AM)、丙烯酸(AA)、丙烯酰氧乙基三甲基氯化铵(DAC)和有机硅单体(KS-10)为原料合成制备了一种新型两性离子型聚合物絮凝剂PAM-D11,并对其分子结构进行了红外光谱和核磁共振谱图表征分析,结果表明各种单体均参与了聚合反应。PAM-D11对目标含油污水具有较好的除油效果,当其投加量为100mg/L时,除油率可以达到96%以上;并且含油污水的矿化度越高,PAM-D11的除油效果越好;当含油污水的pH处于6~8之间时,PAM-D11的除油效果相对较好;随着污水中含油量的不断升高,PAM-D11的除油率稍有降低,但降低幅度较小;另外,在相同的实验条件下,PAM-D11的除油效果明显优于其他市售的无机絮凝剂和有机絮凝剂,说明PAM-D11能够应用于高矿化度含油污水的絮凝处理中。

The oily wastewater from offshore oilfield has the characteristics of high salinity,complex composition, and strong stability,so it is hard to be treated by the conventional polyacrylamide flocculants. A new zwitterionic polymer flocculant PAM-D11 was synthesized from acrylamide(AM),acrylic acid(AA),acryloxyethyl trimethylammonium chloride(DAC) and silicone monomer(KS-10),The molecular structure was characterized by IR and NMR. The results showed that various monomers were involved in the polymerization. Flocculant PAM-D11 had good oil removal effect on target oily wastewater. When its dosage was 100 mg/L,the oil removal rate could reach more than 96%. The higher the salinity of oily wastewater,the better the oil removal effect of PAM-D11. When the pH value of oily wastewater was between 6and 8,the oil removal effect of PAM-D11 was quite well. With the continuous increase of oil content in sewage,the oil removal rate of PAM-D11 decreased slightly,but the decrease range was small. In addition,under the same experimental conditions,the oil removal effect of flocculant PAM-D11 was significantly better than other commercially available inorganic and organic flocculants. It indicated that the developed zwitterionic polymer flocculant PAM-D11 could be applied in the flocculation treatment of high salinity oily wastewater.