C - Chemistry – Metallurgy – 10 – G
Patent
C - Chemistry, Metallurgy
10
G
C10G 21/00 (2006.01) B01D 61/02 (2006.01) B01D 61/14 (2006.01) B01D 69/12 (2006.01) B01D 71/60 (2006.01) C10G 21/28 (2006.01) C10G 31/11 (2006.01)
Patent
CA 2054046
Abstract of the Disclosure The solvent extraction of aromatics contain- ing oil using a selective aromatics extraction solvent to produce an aromatics rich extract phase and an oil rich/aromatics lean raffinate is improved by the steps of subjecting the extract phase to a membrane separa- tion step to produce a permeate phase and a retentate phase passing the retentate phase to a settling zone wherein the retentate phase spontaneously separates into two liquid phases, and recycling the upper phase to the extraction zone, either to the feed inlet or to the bottom of the extract reflux zone to thereby increase the raffinate oil recovered from the extrac- tion tower. Alternatively or in addition to the above, a side stream can be taken from an intermediate zone of the extraction zone (e.g. extraction tower) and fed to a membrane separation to produce a solvent rich perme- ate and an oil rich retentate. The solvent rich permeate is recycled while the oil rich retentate is fed to a settling zone wherein it will spontaneously separate into an oil rich pseudo raffinate upper phase which is recovered and into a solvent rich pseudo extract bottoms phase which is recycled to the solvent extraction zone, preferably at a point below that at which the side stream was withdrawn. The membrane separation zone preferably employs interfacially polymerized membranes under reverse osmosis conditions.
Black Laura E.
Welmers Adrianus
Borden Ladner Gervais Llp
Imperial Oil
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