Recovery of aromatic hydrocarbons and a non-aromatic raffinate s

Details Recovery of aromatic hydrocarbons and a non-aromatic raffinate s Recovery of aromatic hydrocarbons and a non-aromatic raffinate s

1980-06-26

1983-12-06

Thomas, Earl C.

Mineral oils: processes and products

Fractionation

Liquid extraction with solvents

208322, 585865, C07C 708

Patent

active

044192266

ABSTRACT:
A process for the recovery of aromatic hydrocarbons and a non-aromatic raffinate stream from a hydrocarbon charge stock is disclosed. The hydrocarbon charge stock is treated with an aromatics-selective solvent to provide an aromatics-rich solvent stream and a non-aromatic raffinate stream. The aromatics-rich solvent stream is treated in a stripper column at conditions to separate substantially all of the non-aromatic hydrocarbons therefrom. The rich solvent stream is subjected to steam stripping to provide a high purity aromatics stream and an aqueous stream comprising the steam condensate and residual aromatics. This aqueous stream is treated with a minor portion of the non-aromatic raffinate to remove the residual aromatics, and the resulting aqueous stream is utilized to wash the remainder of the raffinate free of solvent. The raffinate stream is recovered substantially free of aromatics.

REFERENCES:
patent: 3556991 (1971-01-01), Gerhold
patent: 3763037 (1973-10-01), Thompson
patent: 3868310 (1975-02-01), Van Kleef et al.

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