Claims
- 1. An extractive distillation process for the separation of hydrocarbon impurities having 4 to 7 carbon atoms from propylene oxide which consists essentially of introducing a feed comprised of propylene oxide containing said hydrocarbon impurities in amount of 100 to 3000 ppm into an intermediate section of an extractive distillation zone, introducing C2-C5 glycol extractive distillation solvent into the upper section of said extractive distillation zone, distilling said hydrocarbon impurities overhead from said extractive distillation zone and removing a mixture comprised of said glycol solvent and said propylene oxide substantially free of said hydrocarbon impurities from the lower section of the said extractive distillation zone.
- 2. The method of claim 1 wherein said extractive distillation solvent is monopropylene glycol.
- 3. The method of claim 1 wherein said extractive distillation solvent is monoethylene glycol.
- 4. The method of claim 1 wherein said extractive distillation solvent is 1,4 butanediol.
RELATED APPLICATION
This application is a continuation-in-part of co-pending application Ser. No. 07/491,074 filed March 12, 1990 now abandoned.
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Number |
Name |
Date |
Kind |
3578568 |
Washall |
May 1971 |
|
3838020 |
Kageyama et al. |
Sep 1974 |
|
3909366 |
Schmidt et al. |
Sep 1975 |
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4402794 |
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Sep 1983 |
|
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
491874 |
Mar 1990 |
|