Solvent extraction process involving membrane separation of extr

Details Solvent extraction process involving membrane separation of extr Solvent extraction process involving membrane separation of extr

1993-06-10

1995-07-25

Spear, Frank

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

210652, B01D 6104

Patent

active

054359180

ABSTRACT:
The solvent extraction of aromatics containing 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 separation 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 extraction 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 permeate 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phase which is recycled to the solvent extraction zone, preferably at a point below that at which the side stream was withdrawn.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.

REFERENCES:
patent: 3951815 (1976-04-01), Wrasedlo
patent: 4277344 (1981-07-01), Cadotte
patent: 4311583 (1982-01-01), Woodle
patent: 4328092 (1982-05-01), Sequeria, Jr.
patent: 4464494 (1984-08-01), King et al.
patent: 4510047 (1985-04-01), Thompson
patent: 4582726 (1986-04-01), Shuey et al.
patent: 4592832 (1986-06-01), Bristow et al.
patent: 4816140 (1989-03-01), Trambouze et al.
patent: 4943475 (1990-07-01), Baker et al.
patent: 4978454 (1990-12-01), Sweet
patent: 5095170 (1992-03-01), Chen et al.
patent: 5120900 (1992-06-01), Chen et al.
patent: 5173191 (1992-12-01), Black
patent: 5234597 (1993-08-01), Welmers et al.
"In Situ-Formed Condensation Polymers For Reverse Osmosis Membranes: Second Phase" North Star Research Inst., Dept. of Interior, NTIS #PB234198.
"Continued Evalution of In Situ-Formed Condensation Polymers For Reverse Osmosis Membranes", Midwest Research Inst., Dept. of Comm. NTIS #PB 253193.
"Liquid Extraction", 2d Ed. R. E. Treybol, McGraw-Hill Book Co., 1963, pp. 144-145; 270-273.

Affiliated with

Also associated with

Rating

Solvent extraction process involving membrane separation of extr does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Solvent extraction process involving membrane separation of extr, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Solvent extraction process involving membrane separation of extr will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-737716