Abstract
A number of tetraalkylammonium methylcarbonate and hydrogencarbonate based ionic liquids are shown to be capable of reacting with the naphthenic acids contained in Doba crude oil via a neutralisation reaction. Spectral studies show that the ionic liquids neutralisation mechanism involves the formation of an ionic liquid-naphthenate complex, liberating methanol and carbon dioxide. Extraction of the neutralised complex into a separate methanol phase and subsequent regeneration using aqueous carbonic acid results in ∼70% of the ionic liquid being recovered for recycle. Isolation of the naphthenic acids shows that these make up to 0.85 wt% of the crude oil. Speciation of the naphthenic acids shows a mixture of monocyclic, through to tetracyclic structures with carbon numbers in the range C12-C40.
Original language | English |
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Pages (from-to) | 60-68 |
Number of pages | 9 |
Journal | Fuel |
Volume | 146 |
Early online date | 19 Jan 2015 |
DOIs | |
Publication status | Published - 15 Apr 2015 |
Keywords
- Naphthenic acid
- Methylcarbonate ionic liquid
- Extraction
- Neutralisation
- Regeneration
- Recycle
- VACUUM FRACTION
- REMOVAL
- WATER
- DECARBOXYLATION
- CATALYSTS
- CORROSION
- SOLVENTS
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Martin Atkins
- School of Chemistry and Chemical Engineering - Emeritus Professor
- Green and Sustainable Chemistry
Person: Emeritus