【作者】 方茹苕；

【导师】 石顺存；

【作者基本信息】 湖南科技大学 ， 应用化学， 2008， 硕士

【摘要】 本论文主要以由环烷酸和二乙烯三胺合成的油溶性咪唑啉中间体为原料,与三氯氧磷进一步合成水溶性的咪唑啉膦酰胺盐酸盐,确定适宜的合成条件。运用静态挂片失重法和电化学极化曲线法,对合成产物在HCl-H₂S-H₂O体系和模拟油田水中的缓蚀性能进行了研究。在咪唑啉膦酰胺盐酸盐的合成中,采用单因素多水平的方法,考察了反应物料的配比、反应温度、反应时间以及溶剂等因素对合成产物的影响,得出最佳的反应条件:咪唑啉与三氯氧磷的摩尔比为3:1,反应最高温度控制在200℃左右,反应时间约为6个小时,采用无水乙醇作溶剂。在HCl-H₂S-H₂O体系中的缓蚀性能研究表明:咪唑啉膦酰胺盐酸盐在该介质中对A3钢具有良好的保护作用,缓蚀效果随其浓度的增加而增大;其缓蚀性能随实验温度的升高而降低;随溶液中H₂S含量的增大而降低,但降低程度逐渐减小,最后几乎不变;但是其缓蚀率随实验时间的延长先增大后降低。在模拟油田水介质中的缓蚀性能研究表明:咪唑啉膦酰胺盐酸盐在该介质中具有最佳投加剂量,缓蚀效果随缓蚀剂浓度的增大先升高后有所降低;其缓蚀效果受介质的pH值影响较大,当溶液呈酸性时,缓蚀率大大提高,此时所需的缓蚀剂的剂量远远低于未调pH值时。并且当溶液pH值为5左右时,其缓蚀效果最好;同时,咪唑啉膦酰胺盐酸盐的缓蚀性能受介质中溶解氧影响也较大,去除溶解氧后其缓蚀率大太提高。电化学极化曲线结果表明:咪唑啉膦酰胺盐酸盐在HCl-H₂S-H₂O中是属于阳极型的混合缓蚀剂,主要抑制了碳钢溶解的阳极过程,同时对阴极反应也有抑制作用;而在模拟油田水中,咪唑啉膦酰胺盐酸盐是属于阴极型缓蚀剂。因此,咪唑啉膦酰胺盐酸盐是一种对碳钢腐蚀反应的阳极和阴极均有抑制作用的缓蚀剂。更多还原

【Abstract】 The oil-soluble imidazoline was synthesized by using naphthenic acid and diethylen triamine as raw materials,then the water-soluble imidazoline phosphoronamide hydrochloride salt（IPAH） was synthesized from imidazoline and phosphorus oxychloride.Through researching on the step of synthesis,different reaction conditions to the influence of the result were investigated,and the optimum reaction condition was obtained.The corrosion inhibition effects of IPAH in HCl and H₂S solution and the simulated oil field water were investigated by static weight loss method and electrochemical polarization curves.During the synthesis of IPAH,the different factors such as the ratio of reactants（imidazoline to phoshpror oxychloride）,reaction time,temperature and solvent effected on the synthesis were studied,and the optimum reaction condition was obtained through tests:the ratio of naphthenic imidazoline to phoshpror oxychloride is 3:1,the maximum temperature is about 200℃,the reaction time is about 6h,and the solvent is anhydrous ethanol.The researches on the inhibition performance of IPAH in HCl and H₂S solution show that: IPAH attains good inhibition on the corrosion of A3 carbon steel,and the inhibition effect is increasing as the concentration of IPAH increases.The corrosion inhibition performance of IPAH is worse as the experiment temperature rises.It’s also decrease when the concentration of H₂S is increasing,but the affect is small,then doesn’t change at last.Finally,the corrosion inhibition rate first increase and then decrease as the experiment time extends.The researches on the inhibition performance of IPAH in the simulated oil field water show that:IPAH has a optimum concentration in the media.And the inhibition performance is effected by the pH value of the solution.The corrosion inhibition is best when the pH value is 5.And it is effected by the oxygen in the solution.When the oxygen is eliminated,the corrosion inhibition is much better.The results obtained from electrochemical polarization curves show that:IPAH is a mixed inhibitor which mainly inhibites the solvent of the carbon steel in anode and also inhibites the cathodic process in HCl and H₂S solution.IPAH is an inhibitor which inhibites the cathodic process in the simulated oilfield water.Therefore,IPAH is an inhibitor which inhibites the anode and cathodic reaction of carbon steel corrosion.更多还原