Selective extraction solvent recovery using regenerated cellulose membrane under reverse osmosis conditions

Patent · Tue Apr 09 04:00:00 EST 1985

OSTI ID:5282507

Thompson, J A

Selective extraction solvents such as NMP, phenol or furfural employed for the extraction of specialty oils, i.e. lubricating, transformer and insulating oils, to remove undesirable aromatic components therefrom, is itself recovered from the extract stream and/or raffinate streams by preferential ultrafiltration through selective membranes of regenerated cellulose. The extract stream, because of its higher solvent content, is the preferred stream for solvent recovery treatment by the reverse osmosis membrane permeation technique. Solvent recovery employing membrane permeation exhibits the advantage of not being energy intensive as is distillation or stripping. The solvent is recovered at a high enough flux rate and at a high enough level of purity to be introduced back into the solvent extraction process optionally at some point in the process wherein the composition of the recovered solvent approximately matches the composition of the solvent present in the process at the point of introduction.

• Assignee: Exxon Research and Engineering Co.
• Patent Number(s): US 4510047
• OSTI ID: 5282507
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
ALDEHYDES
AROMATICS
CARBOHYDRATES
CELLULOSE
DIFFUSION
DISTILLATION
EXTRACTION
FURANS
FURFURAL
HETEROCYCLIC COMPOUNDS
HYDROXY COMPOUNDS
MEMBRANES
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OSMOSIS
PETROLEUM PRODUCTS
PHENOLS
POLYSACCHARIDES
PURIFICATION
REMOVAL
SACCHARIDES
SEPARATION PROCESSES
SOLVENT EXTRACTION