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首页> 外文期刊>Journal of Dispersion Science and Technology >Quaternary Ammonium Salts from Hydrolyzed Fatty Oil Based on Novel Tertiary Amines Used as Corrosion Inhibitors for Pipelines Carbon Steel at Acid Job in Petroleum Industry
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Quaternary Ammonium Salts from Hydrolyzed Fatty Oil Based on Novel Tertiary Amines Used as Corrosion Inhibitors for Pipelines Carbon Steel at Acid Job in Petroleum Industry

机译:基于新型叔胺的水解脂肪油中的季铵盐用作石油工业酸性作业中管道碳钢的腐蚀抑制剂

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摘要

Ten new quaternary ammonium salts (QASs) were designed and synthesized from hydrolyzed fatty oils; the hydrolyzed oils were used as a source of alkyl halides to prepare the QASs by refluxing the fatty alkyl halide with ethoxylated amines as untraditional 3° amines in acetone. The structure of the prepared QASs were characterized by FTIR and 1H NMR spectroscopy. The prepared cationic surfactants QASs were tested as corrosion inhibitors for carbon steel in 1 M HCl solution. The corrosion inhibition efficiency was measured using weight loss and potentiodynamic polarization methods. The inhibition efficiencies obtained from the two employed methods are in good agreement with each other. In generally, the inhibition efficiency increased with increasing the inhibitor concentration. From the obtained data it was found that the inhibition efficiency of QASs, which, based on ethoxylated aromatic tertiary amine, is greater than the efficiencies of the QASs based on ethoxylated aliphatic tertiary amine. The QASs based on fatty alkyl halide from palm oil exhibited the best inhibition efficiency than QASs based on fatty alkyl halides from coconut oil. The potentiodynamic polarization measurements indicated that the inhibitors are of mixed type. The adsorption of the inhibitors on the carbon steel surface in the acid solution was found to obey Langmuir's adsorption isotherm. The free energy of adsorption processes was calculated and discussed. The surface active properties were calculated on the basic of surface tension measurements. The obtained data of inhibition efficiencies were discussed on the light of surface active properties of these QASs and their chemical structures. The quantum chemical calculations was proceeded for QHL1,4,5 and QHP3,4,5 the following quantum chemical indices such as the bond length, bond angle, charge density distribution, highest occupied molecular orbital (HOMO), the lowest unoccupied molecular orbital (LUMO), energy gap ΔE˭HOMO -LUMO, and dipole moment (u) were considered.The surface morphology of carbon steel sample was investigated by scanning electron microscopy.View full textDownload full textKeywordsCationic surfactant, corrosion inhibitors, potentiodynamic, quantum chemistry, quaternary ammonium salts, weight lossRelated var addthis_config = { ui_cobrand: "Taylor & Francis Online", services_compact: "citeulike,netvibes,twitter,technorati,delicious,linkedin,facebook,stumbleupon,digg,google,more", pubid: "ra-4dff56cd6bb1830b" }; Add to shortlist Link Permalink http://dx.doi.org/10.1080/01932691.2011.613705
机译:从水解脂肪油中设计并合成了十种新的季铵盐(QAS)。水解油用作卤代烷的来源,通过将脂肪烷基卤化物与乙氧基化胺(作为非传统3°胺)在丙酮中回流,来制备QAS。通过FTIR和 1 1 H NMR光谱对所制备的QAS进行结构表征。制备的阳离子表面活性剂QAS被测试为碳钢在1 M HCl溶液中的腐蚀抑制剂。使用重量损失和电位动力学极化方法测量腐蚀抑制效率。从两种采用的方法获得的抑制效率彼此非常一致。通常,抑制效率随着抑制剂浓度的增加而增加。从获得的数据中发现,基于乙氧基化的芳族叔胺的QAS的抑制效率大于基于乙氧基化的脂肪族叔胺的QAS的效率。基于棕榈油的脂肪烷基卤化物的QAS表现出比基于椰子油的脂肪烷基卤化物的QAS最好的抑制效果。电位动力学极化测量表明抑制剂是混合型的。发现抑制剂在酸性溶液中在碳钢表面上的吸附符合朗缪尔的吸附等温线。计算并讨论了吸附过程的自由能。在表面张力测量的基础上计算表面活性性质。根据这些QAS的表面活性及其化学结构,讨论了所获得的抑制效率数据。对QHL1,4,5和QHP3,4,5进行以下量子化学指​​标的量子化学计算,例如键长,键角,电荷密度分布,最高占据分子轨道(HOMO),最低未占据分子轨道( LUMO),能隙ΔEËHOMO-LUMO和偶极矩(u)被考虑了。通过扫描电子显微镜研究了碳钢样品的表面形态。查看全文下载全文关键词阳离子表面活性剂,缓蚀剂,电位动力学,量子化学,季铵盐铵盐,减肥有关的变量add var = this = “};添加到候选列表链接永久链接http://dx.doi.org/10.1080/01932691.2011.613705

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