提高聚丙烯酰胺相对分子质量实验条件研究

Study on synthesis of increasing molecular weight of PAM

聚合物驱已成为老油田提高采收率的重要手段之一,驱油用聚丙烯酰胺相对分子质量约为2 000×104,就相同结构和组成的聚合物而言,相对分子质量越大,增粘性能越好,驱油效率越高。利用精制丙烯酰胺单体、碳酸钠和水为主要原料,采用水溶液均相聚合法,分析了起始反应温度、螯合剂EDTA-2Na的物质的量浓度、水解时间等对聚丙烯酰胺相对分子质量的影响,确定了较高相对分子质量聚丙烯酰胺的合成条件。结果表明,在起始反应温度为10℃,螯合剂EDTA-2Na的物质的量浓度为0.168 mmol/L,水解时间为5 h时,聚丙烯酰胺相对分子质量最大。

Molecular weight of polyacrylamide is one of the main factors affecting its properties.In order to increase molecular weightof polyacrylamide,an experiment study on the course of polymerization generation of polyacrylamide is conducted.Using refined acryl-amide,sodium carbonate and water as main raw,by method of anterior alkaline cohydrolysis polymerization.This experiment analyzesthe influence rule of initial reaction temperature,the dosage of chelator EDTA-2Na,hydrolysis time on the high Molecular weight ofpolyacrylamide,and confirms the synthetic conditions of high molecular weight of polyacrylamide.The results obtained provide the ba-sis for the industrialproduction of polyacrylamide.