Extractive distillation process for recovering aromatics...

Mineral oils: processes and products – Fractionation – Liquid extraction with solvents

Reexamination Certificate

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C208S321000, C208S325000, C208S326000, C208S330000, C208S331000, C208S333000, C208S334000

Reexamination Certificate

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07666299

ABSTRACT:
A process for recovering polar hydrocarbons from non-polar hydrocarbons, such as aromatics from non-aromatics, naphthenes from paraffins and isoparaffins, or olefins from paraffins and isoparaffins, in feed mixtures containing at least a measurable amount of heavier hydrocarbons. This improved extractive distillation (ED) process recovers aromatic hydrocarbons including benzene, toluene, and xylenes from the C6-C8 petroleum streams containing a measurable amount of C9+ hydrocarbons. The ED process also recovers benzene and toluene from the C6-C7 petroleum streams containing a measurable amount of C8+ hydrocarbons. The ED solvent utilized to recover and purify the aromatic hydrocarbons from the petroleum stream with a heavier than intended feedstock of hydrocarbons is also regenerated and recovered.

REFERENCES:
patent: 4081355 (1978-03-01), Preusser et al.
patent: 5202520 (1993-04-01), Forte
patent: 5877385 (1999-03-01), Lee et al.

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