US4399288A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of a 2-oxazoline from an aqueous solution
Assignee: Dow Chemical Co
•
Filing: 1981-01-21
•
Granted: 1983-08-16
•
Expires: 2001-01-21
Abstract
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.
Inventors
- 👤 John C. McClure
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:26
CPC Classifications
C; C07; C07D; C07D263/00; C07D263/02; C07D263/08; C07D263/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
142 words
A process for the separation of a 2-oxazoline, represented by the formula I ##STR2## wherein R 1 -R 4 are each independently hydrogen, C 1 -C 2 alkyl or C 1 -C 2 hydroxyalkyl and R is hydrogen, C 1 -C 4 alkyl or C 2 -C 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.
Claim 2
Dependent Claim
142 words
A process for the separation of a 2-oxazoline, represented by the formula I ##STR2## wherein R 1 -R 4 are each independently hydrogen, C 1 -C 2 alkyl or C 1 -C 2 hydroxyalkyl and R is hydrogen, C 1 -C 4 alkyl or C 2 -C 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.
Claim 3
Dependent Claim
22 words
The process as described in claim 1 wherein R 1 -R 4 are each hydrogen and R is methyl, ethyl or isopropenyl.
Claim 4
Dependent Claim
11 words
The process as described in claim 2 wherein R is ethyl.
Claim 5
Dependent Claim
42 words
The process as described in claim 1 wherein a pressure differential in the range from about 50 to about 700 millimeters of mercury is maintained between the first surface of the polymeric membrane and the permeate zone during Steps (a) and (b).
Claim 6
Dependent Claim
18 words
The process as described in claim 1 or 4 wherein the polymeric membrane is a polyethylene hollow fiber.
Claim 7
Dependent Claim
29 words
The process as described in claim 1 wherein the temperature of the aqueous solution in Step (a) is in the range from about 40° C. to about 60° C.
Claim 8
Dependent Claim
26 words
The process as described in claim 6 wherein the temperature in the permeate zone is in the range from about 40° C. to about 80° C.
Claim 9
Dependent Claim
18 words
The process as described in claim 1 wherein the 2-oxazoline is transported as a vapor in Step (c).
Claim 10
Dependent Claim
22 words
The process as described in claim 8 wherein an inert gas stream is used to transport the 2-oxazoline vapors in Step (c).
References Cited (Backward Citations)
US2953502A
Cited
US2981680A
Cited
US3225107A
Cited
US3402107A
Cited
GB1502562A
Cited
US4218312A
Cited
US4082658A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-15 | 1987-02-14 | 1987-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-15 | 1991-02-14 | 1991-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-15 | 1995-02-14 | 1995-08-16 | $7700.00 | Window Closed / Lapsed |