Recovery of dewaxing aid using asymmetric polyimide ultrafiltrat

Details Recovery of dewaxing aid using asymmetric polyimide ultrafiltrat Recovery of dewaxing aid using asymmetric polyimide ultrafiltrat

1988-03-28

1989-06-06

Sever, Frank

Liquid purification or separation

Processes

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

210654, B01D 1300

Patent

active

048369276

ABSTRACT:
Dewaxing aids used to assist in the solvent dewaxing of waxy hydrocarbon oils are recovered from the dewaxed oil or waxy precipitate, or both, by selective permeation of the oil or wax through a perm-selective polyimide ultrafiltration membrane, under ultrafiltration conditions, leaving a retentate of dewaxing aid, or reduced oil and/or wax content, which dewaxing aid-rich retentate can be recycled to the solvent dewaxing process.

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"High-Temperature Ultrafiltration Membrane", Sarbolouki, JPL Invention Report 30-4918/NPO-15431, 1982.
"New Polyimide Ultrafiltration Membrane for Organic Use", Iwama, et al, Journal of Membrane Science 11 (1982), 297-309.

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