Solvent extraction

Details Solvent extraction Solvent extraction

1976-04-27

1977-08-30

Levine, Herbert

Mineral oils: processes and products

Fractionation

Liquid extraction with solvents

208327, 252364, 260674SE, C01G 2116

Patent

active

040453324

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.

REFERENCES:
patent: 2419499 (1947-04-01), Oosterhout et al.
patent: 2440442 (1948-04-01), Hillyer et al.
patent: 2485070 (1949-10-01), Schulze et al.
patent: 2850461 (1958-09-01), Bloch et al.

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