曼尼希碱型盐酸酸化缓蚀剂的合成与性能评价

Synthesis and Evaluation of Mannich Base Corrosion Inhibitor for Hydrochloric Acidizing Fluid

以苄胺、苯乙酮、甲醛为原料合成了一种曼尼希碱,通过正交实验得到最佳合成条件:苯乙酮、甲醛、苄胺物质的量比1:1.5:1.5,反应时间10 h,反应体系pH值2～3,反应温度90℃。最佳条件下合成的曼尼希碱与增效剂丙炔醇、碘化钾以质量比1:0.2:0.5复配,得到曼尼希碱型盐酸酸化缓蚀剂。缓蚀性能考察实验结果表明,研制的曼尼希碱型盐酸酸化缓蚀剂具有良好的缓蚀效果。在15%的盐酸介质中,90℃下,缓蚀剂用量为1.0%时,钢片腐蚀速率仅为2.987g/(m^2.h);当温度升高到150℃时,增加缓蚀剂用量到1.5%,腐蚀速率仅为3.646 g/(m^2·h);含量低于20%的盐酸介质中,缓蚀剂用量为1.0%时,腐蚀速率低于4 g/(m^2·h)。采用红外光谱对合成产物进行了表征。

optimum s A kind of Mannich base was synthesized from be nzylamine, acetophenone, and formaldehyde. The ,ynthesizing conditions were determined by the orthogonal none） ：n（formaldehyde） ：n（benzylamine） = 1 ： 1.5： 1.5, reaction test, which were as follows： n（acetophetime 10 hours, pH value of the reaction mixture 2 - 3, and reaction temperature 90 ~C. The Mannich base corrosion inhibitor for hydrochloric acidizing fluid was obtained by compounding the Mannich base with synergistic agents such as propargyl alcohol and potassium iodide in mass ratio of 1：0.2：0.5. The test results showed that the Marmich base corrosion inhibitor had good corrosion inhibiting performance. The corrosion rate for the steel sample was only 2. 987 g/（m^2·h） by adding 1.0% the corrosion inhibitor in 15% （w） hydrochloric acid at 90 ℃ and the corrosion rate was 3.646 g/（m^2·h） by adding 1.5% the corrosion inhibitor in 15% （w） hydrochloric acid at 150 ℃ and the corrosion rate was less than 4 g/（ m^2· h） by adding 1.0% the corrosion inhibitor in 〈 20% （w） hydrochloric acid at 90 ℃. The synthesized product was characterized by IR.