Molecular and electronic structure elucidation of Fe2+/Fe3+ complexed chelators used in iron sulphide scale removal in oil and gas wells
Author | Onawole, Abdulmujeeb T. |
Author | Hussein, Ibnelwaleed A. |
Author | Sultan, Abdullah |
Author | Abdel-Azeim, Safwat |
Author | Mahmoud, Mohamed |
Author | Saad, Mohammed A. |
Available date | 2020-05-14T09:55:43Z |
Publication Date | 2019 |
Publication Name | Canadian Journal of Chemical Engineering |
Resource | Scopus |
ISSN | 84034 |
Abstract | Quantum chemical calculations based on DFT are employed to study the electronic structure and binding affinity of chelators used in the removal of iron sulphide scales. Three chelating agents, EDTA, HEDTA, and DTPA, are considered in this work. The complexes showed a coordination number of 5, 6, and 7 for Fe2+ and Fe3+ ions with HEDTA, EDTA, and DTPA, respectively. However, regarding EDTA, Fe3+ could coordinate with an additional water molecule and form a seven-coordinate complex. The calculated binding energies agreed with the experimental stability constants of the chelators in the order DTPA > EDTA > HEDTA for both Fe2+/Fe3+ complexes. The binding free energies showed a spontaneous reaction with Fe3+ having a stronger binding affinity than Fe2+ due to electrostatic forces. This investigation provides insights regarding how chelators that are applied in iron sulphide scale removal may be designed by increasing the number of nitrogen atoms to above the number of carboxylate groups. - 2019 Canadian Society for Chemical Engineering |
Sponsor | This publication was made possible by NPRP Grant # 9-084-2-041 from the Qatar National Research Fund (a member of Qatar Foundation). The findings achieved herein are solely the responsibility of the authors. Qatar University and the Gas Processing Center are also acknowledged for their support. |
Language | en |
Publisher | Wiley-Liss Inc. |
Subject | chelating agents DFT DTPA iron sulphide scales |
Type | Article |
Pagination | 2021-2027 |
Issue Number | 7 |
Volume Number | 97 |
Files in this item
Files | Size | Format | View |
---|---|---|---|
There are no files associated with this item. |
This item appears in the following Collection(s)
-
Chemical Engineering [1155 items ]
-
Gulf Studies Center Research [109 items ]