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Determination of three-dimensional solubility parameters and solubility spheres for naphthenic mineral oils
Nynas AB.
Nynas AB.
2008 (English)In: Energy & Fuels, ISSN 0887-0624, E-ISSN 1520-5029, Vol. 22, no 5, 3395-3401 p.Article in journal (Refereed) Published
Abstract [en]

The Hansen solubility parameters were determined for three hydrocarbon fluids, equivalent to naphthenic mineral oil of different degrees of refinement. This was done by an indirect method based on the solubility of the hydrocarbon fluids in a system of solvents with known Hansen solubility parameters. It was concluded that the method may serve is a tool to estimate the approximate solubility parameters of naphthenic oil. However, in this study, the accuracy was insufficient to separate naphthenic oil of different degrees of refinement.

Place, publisher, year, edition, pages
2008. Vol. 22, no 5, 3395-3401 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-101070DOI: 10.1021/ef800256uISI: 000259332600068OAI: oai:DiVA.org:kth-101070DiVA: diva2:546194
Note
QC 20120822Available from: 2012-08-22 Created: 2012-08-22 Last updated: 2017-12-07Bibliographically approved
In thesis
1. Application of copper corrosion inhibitors in mineral oil: Surface analytical studies and corrosion mitigation evaluations
Open this publication in new window or tab >>Application of copper corrosion inhibitors in mineral oil: Surface analytical studies and corrosion mitigation evaluations
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This doctoral thesis explores the copper corrosion inhibiting properties of a number of nitrogen containing hetero-organic compounds in refined mineral oil. Traditional organic corrosion inhibitors, as well as novel and bioorganic compounds have been studied.

The Hansen solubility parameters were determined for the three commercial organic corrosion inhibitors; benzotriazole, tolyltriazole and Irgamet 39™, an N-(aminomethyl) substituted triazole. The determination was done using an indirect method utilizing the solubility of the inhibitors in various solvents. The calculated Hansen solubility parameters of the inhibitors were compared with the Hansen solubility parameters and solubility sphere of refined mineral oil. The obtained Hansen solubility parameters of benzotriazole indicate very low solubility in mineral oils, while the solubility of tolyltriazole was slightly higher due to the methyl substitution. The obtained Hansen solubility parameters of Irgamet 39™ indicate full miscibility with refined mineral oil. The adsorption kinetics of the inhibitors on copper surfaces in refined mineral oil was studied by means of in situ ellipsometry and related to the Hansen solubility parameters. A good correlation was seen; the compound with the highest solubility (Irgamet 39™) generated the thinnest film, while the greatest film thickness was seen for the molecule with the lowest solubility (benzotriazole).

The issue of decomposition of the N-(aminomethyl) substituted Irgamet 39™ and Irgamet 30™ upon adsorption was addressed and analysed by using Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS). The ToF-SIMS study revealed that both compounds appeared to lose their aminomethyl tails upon adsorption. No signals from the intact molecules were detected.

The possibility of utilising bio-organic substances as organic corrosion inhibitors has been examined. The copper corrosion inhibiting effects of four bioorganic compounds; adenine, purine, cysteine and histidine were studied by in situ ellipsometry, copper dissolution, and a standardised industrial corrosion test developed by the International Electrotechnical Commission (IEC 62535). Adenine and purine were found to adequately mitigate copper corrosion, while cysteine and histidine were found to have low, or even accelerating, effects on the corrosion rate.

The corrosion inhibiting properties of five benzo-fused azoles; benzotriazole, benzimidazol, indole, benzothiazole and benzothiadiazole in refined mineral oil were analysed by means of ellipsometry, ToF-SIMS, copper dissolution studies and the standardised industrial corrosion test (IEC 62535). It was demonstrated that copper corrosion was mitigated by the addition of benzotriazole and benzimidazole. However, addition of indole, benzothiazole and benzothiadiazole did not generate any significant corrosion mitigating effect. In general, the corrosion inhibition efficiency of the investigated molecules was found to decrease with increased polarizability of the molecule.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2012. viii, 61 p.
Series
Trita-CHE-Report, ISSN 1654-1081 ; 2012:33
National Category
Corrosion Engineering
Identifiers
urn:nbn:se:kth:diva-101316 (URN)978-91-7501-433-3 (ISBN)
Public defence
2012-09-28, F3, Lindstedtsvägen 26, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20120829

Available from: 2012-08-29 Created: 2012-08-27 Last updated: 2012-08-29Bibliographically approved

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