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Polar nitrogen-containing aromatic compounds as carriers of natural diesel lubricity

Title data

Matzke, Markus ; Jess, Andreas ; Litzow, Ulrike:
Polar nitrogen-containing aromatic compounds as carriers of natural diesel lubricity.
In: Fuel. Vol. 140 (2015) . - pp. 770-777.
ISSN 0016-2361
DOI: https://doi.org/10.1016/j.fuel.2014.09.037

Official URL: Volltext

Abstract in another language

Hydrodesulfurization (HDS) reduces the original lubricity of diesel fuel on which fuel injection equipments (FIE) rely for proper operation and lifetime. In technical terms this problem was solved by addition of lubricity additives to low and ultra-low sulfur diesel. In scientific terms there is no clear final conclusion on the role of neither sulfur- nor polar oxygen- and nitrogen-containing compounds. In this study, polar compounds were extracted from a gas oil by an ionic liquid so that the fuel was not saturated by hydrogen like in the industrial HDS process. Stepwise extraction and measurement of sulfur and nitrogen contents as well as lubricity revealed a significant correlation between lubricity and nitrogen content. For investigation on the molecular structure of the lubricating nitrogen compound, selected model compounds with different structural features were added to an ultra-low sulfur diesel (ULSD). The results indicate that the combination of a diaromatic base structure with a polar substituent and a nitrogen heteroatom exhibits excellent lubricity improvement superior to those structures lacking one or more of these three properties. A three-stage tribological model for the boundary lubrication by such compounds is proposed in this paper. These compounds are identified as the main carrier of original diesel lubricity which are removed by the industrial HDS process.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Lubricity
Hydrodesulfurization
Ionic liquid extraction
Nitrogen
Aromatics
Institutions of the University: Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Chemical Engineering
Faculties > Faculty of Engineering Science > Chair Chemical Engineering > Chair Chemical Engineering - Univ.-Prof. Dr.-Ing. Andreas Jess
Faculties
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
600 Technology, medicine, applied sciences > 600 Technology
600 Technology, medicine, applied sciences > 620 Engineering
600 Technology, medicine, applied sciences > 660 Chemical engineering
Date Deposited: 21 Jan 2015 09:04
Last Modified: 12 Apr 2018 09:47
URI: https://eref.uni-bayreuth.de/id/eprint/5675