Novel cationic surfactants from fatty acids and their corrosion inhibition efficiency for carbon steel pipelines in 1 M HCl
Four fatty acids were used as a source of alkyl halides. Untraditionally tertiary amines were prepared by ethoxylation of aromatic and aliphatic fatty amines. These alkyl halide and tertiary amines were used to prepare 20 cationic quaternary ammonium surfactants (QASS). Their chemical structures wer...
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Egyptian Petroleum Research Institute
2011-06-01
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| Series: | Egyptian Journal of Petroleum |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1110062111000080 |
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| author | A.M. Al-Sabagh N.Gh. Kandil O. Ramadan N.M. Amer R. Mansour E.A. Khamis |
| author_facet | A.M. Al-Sabagh N.Gh. Kandil O. Ramadan N.M. Amer R. Mansour E.A. Khamis |
| author_sort | A.M. Al-Sabagh |
| collection | DOAJ |
| description | Four fatty acids were used as a source of alkyl halides. Untraditionally tertiary amines were prepared by ethoxylation of aromatic and aliphatic fatty amines. These alkyl halide and tertiary amines were used to prepare 20 cationic quaternary ammonium surfactants (QASS). Their chemical structures were characterized and they 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 nearly closed. From the obtained data it was found that, the inhibition efficiency increases with increasing the inhibitor concentration until the optimum one. Also, it was found that the inhibition efficiency of QASs which based on ethoxylated aromatic tertiary amine is greater than the obtained efficiencies by the QASs which based on ethoxylated aliphatic tertiary amines. The QASs based on alkyl halide C16 exhibited the maximum inhibition efficiency 98.8%. Adsorption of the inhibitors on the carbon steel surface was found to obey Langmuir’s adsorption isotherm. The quantum chemical calculations were done for some selected quaternary ammonium compounds based on their chemical structures QL1,4,5–QP3,4,5. The following quantum chemical indices such as the bond length, bond angle, charge density distribution, highest occupied molecular orbital (HOMO), lowest unoccupied molecular orbital (LUMO), energy gap ΔE = HOMO − LUMO, and dipole moment (u) were considered. The relation between these parameters and the inhibition efficiencies was explained on the light of the chemical structure of the used inhibitors. |
| format | Article |
| id | doaj-art-38981e71fcbb4bdcabaea6b75c943e12 |
| institution | DOAJ |
| issn | 1110-0621 |
| language | English |
| publishDate | 2011-06-01 |
| publisher | Egyptian Petroleum Research Institute |
| record_format | Article |
| series | Egyptian Journal of Petroleum |
| spelling | doaj-art-38981e71fcbb4bdcabaea6b75c943e122025-08-20T03:04:42ZengEgyptian Petroleum Research InstituteEgyptian Journal of Petroleum1110-06212011-06-01202475710.1016/j.ejpe.2011.06.007Novel cationic surfactants from fatty acids and their corrosion inhibition efficiency for carbon steel pipelines in 1 M HClA.M. Al-Sabagh0N.Gh. Kandil1O. Ramadan2N.M. Amer3R. Mansour4E.A. Khamis5Department of Petroleum Applications, Egyptian Petroleum Research Institute (EPRI), Ahmed El-Zomor Street 1, Nasr City, Cairo 11727, EgyptChemistry Department, Faculty of Girls for Science, Art and Education, Ain Shams University, Asmaa Fahmi Street, Helliopolis, Cairo, EgyptChemistry Department, Faculty of Girls for Science, Art and Education, Ain Shams University, Asmaa Fahmi Street, Helliopolis, Cairo, EgyptDepartment of Petroleum Applications, Egyptian Petroleum Research Institute (EPRI), Ahmed El-Zomor Street 1, Nasr City, Cairo 11727, EgyptDepartment of Petroleum Applications, Egyptian Petroleum Research Institute (EPRI), Ahmed El-Zomor Street 1, Nasr City, Cairo 11727, EgyptDepartment of Petroleum Applications, Egyptian Petroleum Research Institute (EPRI), Ahmed El-Zomor Street 1, Nasr City, Cairo 11727, EgyptFour fatty acids were used as a source of alkyl halides. Untraditionally tertiary amines were prepared by ethoxylation of aromatic and aliphatic fatty amines. These alkyl halide and tertiary amines were used to prepare 20 cationic quaternary ammonium surfactants (QASS). Their chemical structures were characterized and they 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 nearly closed. From the obtained data it was found that, the inhibition efficiency increases with increasing the inhibitor concentration until the optimum one. Also, it was found that the inhibition efficiency of QASs which based on ethoxylated aromatic tertiary amine is greater than the obtained efficiencies by the QASs which based on ethoxylated aliphatic tertiary amines. The QASs based on alkyl halide C16 exhibited the maximum inhibition efficiency 98.8%. Adsorption of the inhibitors on the carbon steel surface was found to obey Langmuir’s adsorption isotherm. The quantum chemical calculations were done for some selected quaternary ammonium compounds based on their chemical structures QL1,4,5–QP3,4,5. The following quantum chemical indices such as the bond length, bond angle, charge density distribution, highest occupied molecular orbital (HOMO), lowest unoccupied molecular orbital (LUMO), energy gap ΔE = HOMO − LUMO, and dipole moment (u) were considered. The relation between these parameters and the inhibition efficiencies was explained on the light of the chemical structure of the used inhibitors.http://www.sciencedirect.com/science/article/pii/S1110062111000080Cationic surfactantQuaternary ammonium saltsWeight lossPotentiodynamic and quantum chemical calculations |
| spellingShingle | A.M. Al-Sabagh N.Gh. Kandil O. Ramadan N.M. Amer R. Mansour E.A. Khamis Novel cationic surfactants from fatty acids and their corrosion inhibition efficiency for carbon steel pipelines in 1 M HCl Egyptian Journal of Petroleum Cationic surfactant Quaternary ammonium salts Weight loss Potentiodynamic and quantum chemical calculations |
| title | Novel cationic surfactants from fatty acids and their corrosion inhibition efficiency for carbon steel pipelines in 1 M HCl |
| title_full | Novel cationic surfactants from fatty acids and their corrosion inhibition efficiency for carbon steel pipelines in 1 M HCl |
| title_fullStr | Novel cationic surfactants from fatty acids and their corrosion inhibition efficiency for carbon steel pipelines in 1 M HCl |
| title_full_unstemmed | Novel cationic surfactants from fatty acids and their corrosion inhibition efficiency for carbon steel pipelines in 1 M HCl |
| title_short | Novel cationic surfactants from fatty acids and their corrosion inhibition efficiency for carbon steel pipelines in 1 M HCl |
| title_sort | novel cationic surfactants from fatty acids and their corrosion inhibition efficiency for carbon steel pipelines in 1 m hcl |
| topic | Cationic surfactant Quaternary ammonium salts Weight loss Potentiodynamic and quantum chemical calculations |
| url | http://www.sciencedirect.com/science/article/pii/S1110062111000080 |
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