Solvent extraction

US4045332A · kind A · utility

Assignee

• The British Petroleum Company Limited · GB

Inventors

• Eric Forbes · Canton, US
• Angus Joseph Dickson Reid

Key dates

• Filing date: Apr 27, 1976
• Grant date: Aug 30, 1977
• Expiry date: Apr 27, 1996

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C10G21/12
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

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.