| LI Jun-li,SHEN Yan-bin,LI Ji-yang,WANG Jia,ZHANG Ying.Study on the Inhibitor of Schiff Base Pyridine Quaternary Ammonium Salt for Anti-High Temperature and High Concentration Hydrochloric Acid[J],50(9):303-310 |
| Study on the Inhibitor of Schiff Base Pyridine Quaternary Ammonium Salt for Anti-High Temperature and High Concentration Hydrochloric Acid |
| Received:November 22, 2020 Revised:May 13, 2021 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2021.09.032 |
| KeyWord:corrosion inhibitor schiff base pyridine quaternary ammonium salt isothermal adsorption quantum chemical |
| Author | Institution |
| LI Jun-li |
Shaanxi Research Design Institute of Petroleum and Chemical Industry, Xi’an , China;Shaanxi Provincial Key Laboratory of Petroleum Fine Chemicals, Xi’an , China |
| SHEN Yan-bin |
Shaanxi Research Design Institute of Petroleum and Chemical Industry, Xi’an , China;Shaanxi Provincial Key Laboratory of Petroleum Fine Chemicals, Xi’an , China |
| LI Ji-yang |
Shaanxi Research Design Institute of Petroleum and Chemical Industry, Xi’an , China;Shaanxi Provincial Key Laboratory of Petroleum Fine Chemicals, Xi’an , China |
| WANG Jia |
Shaanxi Research Design Institute of Petroleum and Chemical Industry, Xi’an , China;Shaanxi Provincial Key Laboratory of Petroleum Fine Chemicals, Xi’an , China |
| ZHANG Ying |
Shaanxi Research Design Institute of Petroleum and Chemical Industry, Xi’an , China;Shaanxi Provincial Key Laboratory of Petroleum Fine Chemicals, Xi’an , China |
|
| Hits: |
| Download times: |
| Abstract: |
| A long-term compound system of environment-friendly, high temperature and concentrated acid resistance was developed. The molecular structure of Schiff base pyridine quaternary ammonium salt was characterized by infrared spectrometer, corrosion and adsorption mechanism of corrosion inhibitor on N80 were studied by high temperature and high pressure corrosion determinator, adsorption isothermal model, kinetic parameters, scanning electron microscope and quantum chemical calculation. The results showed the corrosion rate of N80 decreased sharply and inhibition efficiency increased largely at low mass concentration, and both gradually became stable at high mass concentrations with the increase of Schiff base pyridine quaternary ammonium salt corrosion inhibitor (the following abbreviation was Shif-PyQA) at three temperatures of 120 ℃, 140 ℃ and 160 ℃; the corrosion rate of blank solution was much higher than that of Shif-PyQA solution during the temperature range; the corrosion rate of N80 increased continuously and inhibition efficiency decreased slowly with the increase of temperature and the extension of reaction time, but the decrease was small. When the temperature was 120 ℃ and the mass concentration of Shif-PyQA was 2%, the corrosion rate of N80 was 28.77 g/(m2.h) and the inhibition efficiency was 97.97% in 20% HCl; when the temperature was 140 ℃ and the mass concentration of Shif-PyQA was 3%, the corrosion rate of N80 was 37.12 g/(m2.h) and the inhibition efficiency was 97.71% in 20% HCl; when the temperature was 160 ℃ and the mass concentration of Shif-PyQA was 4%, the corrosion rate of N80 was 63.91 g/(m2.h) and the inhibition efficiency was 96.41% in 20% HCl, the adsorption of Shif-PyQA on N80 surface followed the Langmuir isotherm adsorption model, which belonged to single molecular layer chemical adsorption, and the adsorption on N80 surface was a spontaneous process; the results of kinetic parameters showed that the activation energy was increased to 74.16~88.43 kJ/mol after adding different concentrations of Shif-PyQA, which belonged to chemical adsorption. Quantum chemical researches showed that Schiff base pyridine quaternary ammonium salt (the following abbreviation was PyQ-S) molecules could form a multicenter stable adsorption with metals, and the trend to accept electrons of PyQ-S molecules was greater than that to provide electrons. Shif-PyQA can meet the requirements of the relevant indicators of SY/T 5405—2019, and has a good corrosion inhibition effect on the N80 when the temperature is 120 ℃, 140 ℃, 160 ℃. |
| Close |
|
|
|