Separation of a 2-oxazoline from an aqueous solution
AssigneeThe Dow Chemical Company
InventorJohn C. McClure
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Abstract
A 2-oxazoline is separated from an aqueous solution by contacting this solution with a membrane selectively permeable to the 2-oxazoline, removing the 2-oxazoline as a vapor on the other side of the membrane and recovering it by cooling. Polyethylene hollow fibers are particularly desirable membranes, which purify the 2-oxazoline as it is separated from the water.
Claims9
A process for the separation of a 2-oxazoline, represented by the formula I ##STR2## wherein R.sub.1 -R.sub.4 are each independently hydrogen, C.sub.1 -C.sub.2 alkyl or C.sub.1 -C.sub.2 hydroxyalkyl and R is hydrogen, C.sub.1 -C.sub.4 alkyl or C.sub.2 -C.sub.4 alkenyl, from an aqueous solution, said process comprising the steps of
- (a) contacting an aqueous solution of a 2-oxazoline and an amide adduct of 2-oxazoline with a surface of a polymeric membrane, comprising a homopolymer or copolymer of an olefin, which is selectively permeable to the 2-oxazoline but is less permeable to water and the amide adduct;
- (b) permeating the 2-oxazoline through the membrane to a non-communicating permeate zone;
- (c) transporting the 2-oxazoline from the permeate zone to a recovery zone;
- and
- (d) recovering the 2-oxazoline essentially free of water in the recovery zone.
Dependencies are inferred from the claim text.