低分子有机胺类杀菌剂的合成与评价

Synthesis and evaluation of low molecular organic amine bactericide

油田回注污水常用杀菌剂为阳离子型季铵盐类杀菌剂,在聚合物驱油注水系统中,季铵盐类杀菌剂常与采出水中残留的聚合物发生反应而丧失杀菌效果,当投加量为60 mg/L时杀菌率仅为80%。杀菌效果不好,不仅引起管道设备的细菌腐蚀,而且细菌还会降低聚合物黏度,因此,需要研发不易与聚合物反应的杀菌剂。以氯化苄和二乙烯三胺为原料,合成了低分子质量有机胺类杀菌剂,通过单因素实验以及正交设计实验确定了合成杀菌剂的最佳工艺方案,当溶质质量分数为60%、反应介质为1,4-二氧六环、反应温度为50℃、反应时间为2.5 h、搅拌速度为120 r/min时,反应物转化率可达到96%以上。在含聚污水中加入该杀菌剂进行评价,当投加量为60 mg/L时杀菌率可达到98.1%。

Most of the oilfields commonly use cationic quaternary ammonium salt as bactericide in reinjection sewage.However,in polymer flooding and water injection system,quaternary ammonium salt bactericide often lose its sterilization effect due to its reaction with polymers remaining in sewage. When the dosage quantity of quaternary ammonium salt bactericide is 60 mg·L-1,the sterilization rate will be only 80%. Bad sterilization effect can lead to corrosion of pipeline by bacteria and decrease polymer viscosity.Thus,a new bactericide that cannot react with polymers needs to be developed. A low molecular weight organic amine bactericide is synthesized with benzyl chloride and diethylenetriamine as raw materials. Through single factor experiment and orthogonal design experiments,the optimum process conditions are determined for synthesis of new bactericide.The conversion of reactive substances can exceed 96%when the mass concentration of solute is 60%,1,4-dioxane is used as reaction medium,the reaction temperature is at50℃,reaction time lasts for 2. 5 h,and the stirring speed is set as 120 r·min-1.The prepared bactericide is evaluated in the polymers containing sewage,the sterilization rate can reach 98. 1% when the dosage quantity of prepared bactericide is 60 mg·L-1.