C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
196/259, 18/32
C08J 9/36 (2006.01) B01D 67/00 (2006.01) B01D 71/10 (2006.01) C10G 73/02 (2006.01) C10G 73/06 (2006.01)
Patent
CA 1147108
ABSTRACT OF THE DISCLOSURE Hydrophilic, semi-permeable , regenerated cellulose membranes are converted to membranes useful for separating organic liquids by a process comprising soaking the membranes in water to remove the glycol they normally contain and then sequentially permeating the water-containing membrane with a series of solvents of decreasing polarity, under pressure, to dis- place the water in the membrane with the first solvent and then sequentially displace each solvent in the membrane with the next, successive solvent of decreasing polarity, beginning with a low molecular weight alcohol or ketone which is completely miscible in water and ending with a solvent exhibiting bulk liguid-liquid miscibility with both the higher polarity solvent immediatelyproceeding it and the organic material desired to be selectively permeated through the membrane and wherein there is complete bulk liquid-liquid misib- ility between any two adjacent solvents In the sequential series. These so-converted membranes are useful for selectively fractionating organic solvent mixtures, (see apparatus figure 1), for selectively removing dewaxing solvent from a dewaxed oil in solvent dewaxing processes (see process scheme figure 3) for removing aromatics from D naphtha stream, for recovering solvent from slack wax/foots oils separation processes, (see process scheme figure 4) etc. The selective separation is accomplished by contacting the organic liquid solution with one side of the modified regenerated membrane, under pressure, resulting in the selective permeation of one component through the membrane yielding n permeate richer in said selected component and a retentate leaner in said selected component.
341323
Gudelis David A.
Shaw David H.
Thompson John A.
Borden Ladner Gervais Llp
Imperial Oil Limited
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