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| Preparation of Imidazoline and Its Quantum Chemistry by Hydrolysis of Tung Oil |
| Received:March 04, 2020 Revised:April 18, 2020 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2020.10.011 |
| KeyWord:hydrolysis of tung oil, inhibitor, CO2 corrosion, quantum chemistry calculations |
| Author | Institution |
| LI Xun-ji |
Petro China Tarim Oilfield Co., Ltd, Korla , China |
| WANG Fu-shan |
Petro China Tarim Oilfield Co., Ltd, Korla , China |
| CHEN Qing-guo |
Petro China Tarim Oilfield Co., Ltd, Korla , China |
| ZHANG Juan-tao |
Institute of Petroleum Pipe Engineering Technology of CNPC, Xi′an , China |
| CUI Xiao-hu |
Petro China Tarim Oilfield Co., Ltd, Korla , China |
| SONG Wen-wen |
Petro China Tarim Oilfield Co., Ltd, Korla , China |
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| Abstract: |
| The work aims to develop corrosion inhibitors that can be made of cheap and available raw materials and applied in practice. Tung oil was hydrolyzed to obtain tung oleic acid, and then aminated and cyclized with diethylenetriamine to form tung oil imidazolin corrosion inhibitor. The electrochemical test and high temperature and high pressure performance evaluation were carried out to the synthesized tung oil imidazolin corrosion inhibitor under the simulated field environment. The molecular dynamics of tung oil imidazolin corrosion inhibitor was simulated by quantum chemical calculation, and its adsorption on Fe surface was discussed. Infrared spectra showed that tung oil could form tung oleic acid after hydrolysis, and the final compound was tung oil imidazolin. The electrochemical test showed that with the increase of the amount of tung oil imidazolin corrosion inhibitor, the self-corrosion potential of the 20# steel sheet increased gradually and the corrosion current decreased. The simulation results of high temperature and high pressure test showed that the corrosion rate decreased obviously after the addition of imidazolin oleate, from 0.3181 mm/a to 0.0392 mm/a. Quantum chemical calculation showed that the imidazolin ring in tung oil imidazolin molecule was adsorbed on the iron surface in parallel, forming a layer of corrosion inhibitor film. Tung oil acid can be obtained by hydrolysis of cheap and available tung oil, and then synthesized with diethylenetriamine by amidation and cyclization to form tung oil imidazolin corrosion inhibitor. The increase of the amount of the inhibitor improves the resistance of corrosion medium transfer and slows down the corrosion of 20# steel sheet, showing a good corrosion inhibition effect. The imidazole ring in the molecular structure can be adsorbed on the iron surface in parallel, so the inhibitor is anode-inhibiting corrosion inhibitor. |
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