Solvent extraction
AssigneeThe British Petroleum Company p.l.c.
InventorsEric Simon Forbes, Angus Joseph Dickson Reid
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Abstract
The degradation of furfural, used in the solvent extraction of aromatics, is inhibited by the use of a furfural-soluble, recoverable amine having a pK.sub.a greater than that of aniline. The preferred amine is N,N-diethyl aniline and the amount used may be 0.001 to 5% wt., preferably 0.01 to 2% wt. by weight of furfural. The recoverable amine may be used in combination with a non-recoverable amine, eg. tri-ethanolamine, the amount of non-recoverable amine being preferably 1 to 1000 ppm wt., particularly 5 to 50 ppm.
Claims7
A composition suitable for the solvent extraction of aromatic hydrocarbons from hydrocarbon mixtures containing them comprising furfural and from 0.001 to 5% wt. by weight of furfural, of a furfural soluble recoverable amine selected from the group consisting of N,N-dialkyl anilines, in which the alkyl groups have from 1 to 5 carbon atoms.
A process for the solvent extraction of hydrocarbon mixtures boiling above 200.degree. C using furfural as the solvent, characterized in that the furfural contains from 0.001 to 5% wt. by weight of furfural, of a furfural-soluble, recoverable amine selected from the group consisting of N,N-dialkyl anilines in which the alkyl groups have from 1 to 5 carbon atoms.
Dependencies are inferred from the claim text.