Liquid purification or separation – Processes – Liquid/liquid solvent or colloidal extraction or diffusing...
Patent
1983-03-10
1987-12-29
Spear, Frank
Liquid purification or separation
Processes
Liquid/liquid solvent or colloidal extraction or diffusing...
210654, 2105004, B01D 1300
Patent
active
047159600
ABSTRACT:
Polycarbonate membranes are prepared for the selective separation of organic liquid mixtures, especially for the separation of ketone dewaxing solvents from dewaxed oil by preshrinking said membranes in presence of a class of solvents of solubility parameter values in the range of from 8.9 to 10 (cal/cm.sup.3).sup.0.5, and which do not dissolve the membranes.
Preshrunk polycarbonate membranes, prepared by the method of the present invention, can be used for the selective separation of the various components in organic liquid mixtures such as, for the separation of dewaxing solvents from dewaxed oil, preferably the separation of ketone dewaxing solvents from dewaxed oil. The separation is based on a reverse osmosis technique whereby the solvent is permeated through the membrane under an applied pressure sufficient to overcome the osmotic pressure of the system. Applied pressures can vary from 50 up to 1,500 psi, depending on solution concentration. The separation can be carried out in the temperature range -30.degree. to about +80.degree. C., preferably about -20.degree. to about +60.degree. C.
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Allocca Joseph J.
Exxon Research and Engineering Company
Spear Frank
LandOfFree
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