Aromatic solvent upgrading using membranes

Details Aromatic solvent upgrading using membranes Aromatic solvent upgrading using membranes

C - Chemistry, Metallurgy

07

C

182/15.4

C07C 7/144 (2006.01) C10G 21/00 (2006.01) C10G 31/11 (2006.01)

Patent

CA 1227437

ABSTRACT OF THE DISCLOSURE The present invention is directed to a pro- cess for producing high quality aromatic solvents in the middle distillate range containing 95+% aromatics by contacting the liquid feed with a perm selective membrane under pressure thereby selectively permeating the aromatic components as the high quality solvents. This separation can be performed by contacting the feed stream in combination with a low boiling light polar aromatics extraction solvent (such as acetonitrile) with the membrane. The middle distillate feed has a molecular weight range of about 120 to 250 g/mole and an aromatic content of 75 to 90 volume percent aro- matics and preferably 80 to 90 volume percent aro- matics. The membranes which can be employed to effect this separation are selected from the group of regener- ated cellulose, cellulose acetate and polyimide mem- branes, preferably the polyimide membranes.

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