【作者】 谢渊；

【导师】 郭兴蓬；

【作者基本信息】 华中科技大学 ， 应用化学， 2007， 硕士

【摘要】 醋酸是深井采油、采气酸化液的重要组成成分,也是油气田中伴生的低分子量有机酸。在油气田产出水中常伴有CO₂、Cl^-及水等多种腐蚀物质,这些腐蚀性物质也常与醋酸共存。本文针对醋酸、二氧化碳共存体系中的金属腐蚀,设计了硫脲基双咪唑啉、硫脲基咪唑啉以及酰胺咪唑基硫脲衍生物三种缓蚀剂分子。本文分别以油酸、月桂酸、二乙烯三胺、二硫化碳为原料合成了硫脲基双咪唑啉;以油酸、二乙烯三胺、硫脲为原料合成了硫脲基咪唑啉;以硫脲、多乙烯多胺、有机酸为原料合成了酰胺咪唑基硫脲衍生物（酰胺咪唑硫酮）,并探讨了酰胺基咪唑基硫脲衍生物的最佳合成条件。通过动电位扫描技术对硫脲基双咪唑啉、硫脲基咪唑啉的缓蚀性能进行了评价,并采用动电位扫描技术、失重法和电化学渗氢实验探讨了酰胺咪唑基硫脲衍生物的吸附行为和缓蚀性能。研究表明硫脲基双咪唑啉在X52钢表面的吸附满足Langmuir吸附等温式,主要通过改变阳极过程起到缓蚀作用;酰胺咪唑基硫脲衍生物在较低的浓度下即对X52钢在醋酸、CO₂体系中的腐蚀和氢渗透有较好的抑制作用,是一种以控制阳极过程为主的缓蚀剂,在X52钢表面的吸附亦满足Langmuir吸附等温式。通过动电位扫描技术、失重法,研究了酰胺咪唑基硫脲衍生物与六次甲基四胺、碘化钾、丁炔醇、磷酸三钠、磷酸酯等几种缓蚀剂的缓蚀协同效应。研究结果表明酰胺咪唑基硫脲衍生物与KI之间存在着一定的协同作用。更多还原

【Abstract】 Acetic acid is an important component of acidizing fluids in oil and gas production industry and a lower molecular organic acid as associated products in producing fluids of gas and oil fields, which coexists mostly with CO₂, Cl^- containing in the producing fluids. So, three molecular structures as corrosion inhibitors, such as symmetrical N,N’- disubstituted thioureido imidazolines, substituted thioureido imidazolines and a new imidazolyl thioureas derivative, were designed.Symmetrical N,N’-disubstituted thioureido imidazolines were synthesized from oleic acid, lauric acid, diethylenetriamine and carbon disulfide. Substituted thioureido imida zolines were synthesized by oleic acid,diethylenetriamine and thiourea. A new imidazolyl thioureas derivative was prepared from thiourea, tetraethylene pentamine, organic acid, and the optimum synthesis condition was investigated.Their inhibiting behavior on X52 steel in saturated CO₂, 0.1mol/LCH3COOH and 0.5%NaCl solutions were investigated by weight loss, potentiodynamic polarization and electrochemical hydrogen permeation measurement. The results showed that symmetrical N,N’-disubstituted thioureido imidazolines’s adsorption behavior obeyed Langmuir equation, and which worked mainly by changing the anodic process of corrosion reaction; amido imidazolyl thiourea is a good inhibitor for inhibiting corrosion and hydrogen permeation even at a low concentration. It also mainly controlled the anodic process of corrosion reaction, and it’s adsorption behavior obeyed Langmuir equation too.The inhibition synergistic effect between amino imidazolyl thiourea and some inhibitors, such as hexamethylenamine, potassium iodide, butynol, trisodium phosphate and organic phosphate, was investigated by potentiodynamic polarization and weight-loss method. The results showed that there was synergistic effect between amino imidazolyl thiourea and KI.更多还原