Optimized synthesis and adsorption behavior of imidazoline corrosion inhibitor

doi:10.16085/j.issn.1000-6613.2015.04.039

Chemical Industry and Engineering Progree ›› 2015, Vol. 34 ›› Issue (04): 1126-1132.DOI: 10.16085/j.issn.1000-6613.2015.04.039

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Optimized synthesis and adsorption behavior of imidazoline corrosion inhibitor

LI Xuekun^1,2, LI Wenhong¹, PAN Liuyi¹, SUN Zhihui¹

1. School of Chemical Engineering, Northwest University, Xi'an 710069, Shaanxi, China;
2. School of Chemistry & Chemical Engineering, Xi'an University, Xi'an 710065, Shaanxi, China

Received:2014-10-13 Revised:2015-01-11 Online:2015-04-05 Published:2015-04-05

咪唑啉缓蚀剂合成工艺优化及吸附性能

李学坤^1,2, 李稳宏¹, 潘柳依¹, 孙智慧¹

1. 西北大学化工学院, 陕西西安 710069;
2. 西安文理学院化学与化学工程学院, 陕西西安 710065

通讯作者: 李稳宏,教授,博士生导师.E-mail liwenhong@nwu.edu.cn.
作者简介:李学坤(1984—),男,讲师,博士研究生.
基金资助:
2012年度陕西省工程中心科研项目(2011ZDGC-XX)及西安市科技计划项目(CX12189WL31).

Abstract

Abstract: A new kind of imidazoline corrosion inhibitor was synthesized by amidation,cyclization and quaternization with oleic acid and diethylene triamine,taking calcium oxide as dehydrating agent,benzyl chloride as quaternizing reagent. The key conditions,including ratio of oleic acid and diethylene triamine,temperature and time of cyclization reaction were optimized by Response Surface Methodology (RSM). The imidazoline corrosion inhibitor was characterized by IR spectrum and UV-vis spectrophotometry. Adsorption and inhibition performance of the imidazoline corrosion inhibitor was investigated with polarization curve. The experiment was conducted under the conditions of oleic acid 0.05 mol,calcium oxide 0.10 mol,benzyl chloride 0.06 mol,2.5h and 55℃ in quaternary ammonium stage. The optimum conditions for imidazoline were as follows:ratio of oleic acid and diethylene triamine 1:1.18,temperature 162.8℃ and reaction time 5.55h. Inhibition efficiency could reach 94% in 15% hydrochloric acid and 200mg/L imidazoline corrosion inhibitor solution at 50℃. Adsorption behavior of corrosion inhibitor obeyed the Langmuir adsorption isotherm. It was spontaneous and exothermic,and mainly belonged to chemical adsorption. Adsorption equilibrium constant was 1.0277′10⁵L/mol with Gibbs free energy -41.75 kJ/mol,enthalpy of adsorption -54.07kJ/mol and entropy -38.11J/(K·mol). Compared with similar synthesis technology ,the process is noted by a lower temperature of cyclization and the product exhibited excellent properties.

Key words: imidazoline, quaternary ammonium salt, corrosion inhibitor, synthesis, performance evaluation, Langmuir adsorption isotherm

摘要： 以油酸、二乙烯三胺为原料,氧化钙为脱水剂,氯化苄为季铵化试剂,经酰胺化-环化、季铵化合成了新型咪唑啉季铵盐缓蚀剂,并对其吸附过程进行了研究.响应面法优化了油酸与二乙烯三胺摩尔比、环化时间和环化温度等合成关键工艺条件,采用红外光谱和可见光吸收光谱法分析产品结构,以动电位扫描极化曲线法评价缓蚀效果.以0.05mol油酸为基准,氧化钙0.10mol,氯化苄0.06mol,季铵化时间2.5h,季铵化温度55℃条件下,优化结果为:n(油酸):n(二乙烯三胺)为1:1.18,环化温度162.8℃,环化时间5.55h;在50℃缓蚀剂浓度200mg/L、15%盐酸溶液中缓蚀率可达94%;该缓蚀剂的吸附行为符合Langmuir 吸附等温式,为自发放热过程,50℃下吸附平衡常数为1.0277′10⁵L/mol,吉布斯自由能为-41.75kJ/mol,吸附热能为-54.07kJ/mol,熵值为-38.11J/(K·mol),属于以化学吸附为主的过程.与同类合成工艺相比较,环化温度明显降低,产物具有优异的缓蚀性能.

关键词: 咪唑啉, 季铵盐, 缓蚀剂, 合成, 性能评价, Langmuir吸附等温式

CLC Number:

LI Xuekun, LI Wenhong, PAN Liuyi, SUN Zhihui. Optimized synthesis and adsorption behavior of imidazoline corrosion inhibitor[J]. Chemical Industry and Engineering Progree, 2015, 34(04): 1126-1132.

李学坤, 李稳宏, 潘柳依, 孙智慧. 咪唑啉缓蚀剂合成工艺优化及吸附性能[J]. 化工进展, 2015, 34(04): 1126-1132.

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Optimized synthesis and adsorption behavior of imidazoline corrosion inhibitor

咪唑啉缓蚀剂合成工艺优化及吸附性能

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