两性咪唑啉的合成及其缓蚀性能研究

Synthesis and Performance Evaluation of Amphoteric Imidazoline as Corrosion Inhibitor

以高纯环烷酸与二乙烯三胺反应合成了中间体咪唑啉,再以去离子水为溶剂,用氯乙酸钠对该中间体进行两性化,制得了水溶性两性咪唑啉缓蚀剂.探讨了反应物配比、反应温度、pH等因素对产物的影响,得出最佳的合成条件为:n(咪唑啉):n(氯乙酸钠)=1:4,90℃-95℃,pH8-10.在浓缩倍数k=1.5的循环冷却水中用旋转挂片失重法得出:两性咪唑啉用量为20mg/L时对碳钢的缓蚀率达到97.28%;与HEDP复配后总剂量为20mg/L时缓蚀率达到99.04%.在模拟油田水中用静态挂片失重法得出:两性咪唑啉与HEDP复配,用量分别为100mg/L和20mg/L时,缓蚀率达到91.01%.表9,参7.

Firstly the mid-pruduct imidazoline was produced by reaction of naphthenic acid and diethylene triamine , then the corrosion inhibitor amphoteric imidazoline , which is soluble in water, was produced by reaction of imidazoline and sodium monochloroacetate in aqueous solution. Some factors such as reactors＇ reacting ratio , reacting temperature and pH, which can affect the product＇s quality , were researched .And the best reacting conditions are： n （imidazoline） ：n （sodium monochloroacetate）= 1：4,90℃ ～95℃, pH=8～ 10. Rotary coupon corrosion tests was used in circulating cooling water whose condensing multiple k=1.5.It showed that the anticorrosion rate on carbon steel was 97.28% with amphoteric imidazoline＇s concetration of 20 mg/L;and it reached 99.04% with the compound system of amphoteric imidazoline and HEDP at total concentration of 20 mg/L.Weight-loss method was carried out in simulated oiffield water .It showeal that the corrosion inhibitive efficiency was 91.01% with the compound system of 100 mg/L amphoteric inidazoline and 20 mg/L HEDP .9tabs., 7refs.