Claims
- 1. In a process for preparing 3,4-epoxy-1-butene by the gas phase epoxidation of 1,3-butadiene by means of oxygen or oxygen-containing gases over silver-containing catalysts and isolation of the 3,4-epoxy-1-butene from the reaction exit mixture, which the improvement comprises performing the gas phase epoxidation in the presence of from 6 to 80 mol % of water vapor, based on the gas mixture supplied to the reactor.
- 2. A process as claimed in claim 1 wherein silver-containing catalysts subject to rapid deactivation by coking are used.
- 3. A process as claimed in claim 1 wherein the 3,4-epoxy-1-butene is extracted from the reaction exit mixture with water.
- 4. A process as claimed in claim 1 wherein the 3,4-epoxy-1-butene is extracted from the reaction exit mixture with water at up to 100.degree. C.
- 5. A process as claimed in claim 1 wherein unconverted 1,3-butadiene from the reaction exit mixture is after removal of the 3,4-epoxy-1-butene recirculated back into the reactor for the preparation of 3,4-epoxy-1-butene.
- 6. A process as claimed in claim 1 wherein unconverted 1,3-butadiene from the reaction exit mixture is after removal of the 3,4-epoxy-1-butene and after removal of the carbon dioxide present in the reaction exit mixture recirculated back into the reactor for the preparation of 3,4-epoxy-1-butene.
- 7. A process as claimed in claim 1 wherein the gas phase epoxidation is carried out in the presence of from 2 to 87% by volume, based on the volume of the gas mixture supplied to the reactor, of a C.sub.1 -C.sub.4 -alkane.
- 8. A process as claimed in claim 1 wherein the gas phase epoxidation is carried out in the presence of from 2 to 87% by volume of methane, based on the volume of the gas mixture supplied to the reactor.
- 9. A process as claimed in claim 1, wherein the epoxidation reaction is carried out at a temperature of from 100.degree. to 400.degree. C.
- 10. A process as claimed in claim 1, wherein the epoxidation reaction is carried out at a temperature of from 120.degree. to 350.degree. C. and a pressure of from 0.1 to 100 bar.
- 11. A process as claimed in claim 1, wherein the epoxidation reaction is carried out at a temperature of from 150.degree. to 300.degree. C. and a pressure of from 0.5 to 50 bar.
- 12. A process as claimed in claim 1, including a step of periodically regenerating the silver-containing catalyst, after it is deactivated by coking, by reacting said catalyst with water and oxygen at a temperature of from 100.degree. to 400.degree. C.
- 13. A process as claimed in claim 12, wherein the regeneration of the catalyst is carried out at a reaction temperature of from 150.degree. to 300.degree. C.
Priority Claims (1)
Number |
Date |
Country |
Kind |
42 41 942.5 |
Dec 1992 |
DEX |
|
Parent Case Info
This application is a 371 of PCT/EP93/03352 Nov. 30, 1993.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
102e Date |
371c Date |
PCT/EP93/03352 |
11/30/1993 |
|
|
3/17/1995 |
3/17/1995 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO94/13653 |
6/23/1994 |
|
|
US Referenced Citations (10)
Foreign Referenced Citations (4)
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Country |
2342791 |
Sep 1977 |
FRX |
315412 |
Sep 1929 |
GBX |
451130 |
Jul 1956 |
GBX |
8907101 |
Aug 1989 |
WOX |