妥尔油基羟乙基咪唑啉的合成及缓蚀性能研究

Synthesis of tall oil-based hydroxyethyl imidazoline and study on its corrosion inhibition properties

以羟乙基乙二胺和妥尔油脂肪酸为原料,通过正交试验合成了妥尔油基羟乙基咪唑啉,利用FT-IR对其进行表征,并研究了其在盐酸体系中的缓蚀性能。结果表明,妥尔油基羟乙基咪唑啉最佳合成工艺为:羟乙基乙二胺与妥尔油脂肪酸的摩尔比为1.2、反应温度梯度为130~210℃、升温速率为20℃/h。缓蚀性能测试结果表明,在90℃、盐酸质量分数为4%、妥尔油基羟乙基咪唑啉质量浓度为300 mg/L时,缓蚀效率高达94.3%,能够有效抑制酸对A3钢片的腐蚀,该吸附行为符合Langmuir吸附等温式。

Tall oil-based hydroxyethyl imidazoline is synthesized by orthogonal experiment from hydroxyethyl ethylenediamine and tall oil fatty acid that is a higher carbon complex fatty acid.The structure of the sample is characterized by FT-IR.The corrosion inhibition performance of tall oil-based hydroxyethyl imidazoline in hydrochloric acid system are investigated.The optimum synthesis process is obtained as follows:the molar ratio of hydroxyethyl ethylenediamine to tall oil fatty acid is 1.2,the reaction temperature gradient is 130-210℃,and the heating rate is 20℃per hour.Corrosion inhibition performance test shows that corrosion inhibition efficiency is as high as 94.3%when the mass concentration of tall oil-based hydroxyethyl imidazoline is 300 mg·L^-1 in a 4 wt.%hydrochloric acid solution at 90℃.Tall oil-based hydroxyethyl imidazoline has a good inhibition efficiency for A3 mild steel in acid solution.The absorption is found to follow Langmuir adsorption isotherm.