Solvent extraction process involving membrane separation of extract phase and/or intermediate zone phase with pseudo extract/pseudo raffinate recycle, preferably employing interfacially polymerized membranes
A method is described for the selective solvent extraction of aromatic hydrocarbons from mixtures of same with non-aromatic hydrocarbons in a hydrocarbon feed stream comprising contacting said hydrocarbon feed stream with a selective aromatics extraction solvent in a solvent extraction zone to produce an aromatics rich extract phase and an aromatics lean raffinate phase passing a side stream comprising a mixed raffinate solution/extract solution which is taken from an intermediate zone of the solvent extraction zone and fed to a membrane separation unit whereby said mixed feed is separated into a solvent-raffinate rich permeate and an extract rich retentate and passing the extract rich retentate to a settling zone where it spontaneously separates 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bottoms phase which is recycled to the solvent extraction zone at a point below that at which the side stream was withdrawn.
- Assignee:
- Exxon Research and Engineering Co., Florham Park, NJ (United States)
- Patent Number(s):
- A; US 5234597
- Application Number:
- PPN: US 7-732011
- OSTI ID:
- 6061776
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020400* -- Petroleum-- Processing
AROMATICS
DISPERSIONS
ENERGY SOURCES
EXTRACTION
FOSSIL FUELS
FUELS
HYDROCARBONS
MANAGEMENT
MATERIALS RECOVERY
MEMBRANE TRANSPORT
MEMBRANES
MIXTURES
ORGANIC COMPOUNDS
ORGANIC SOLVENTS
PETROLEUM
PETROLEUM FRACTIONS
PETROLEUM RESIDUES
PROCESSING
RECYCLING
SEPARATION EQUIPMENT
SEPARATION PROCESSES
SOLVENT EXTRACTION
SOLVENTS
WASTE MANAGEMENT
WASTE PROCESSING