US4668819A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of unsaturated esters of carboxylic acids
Assignee: Hoechst AG
•
Filing: 1985-07-15
•
Granted: 1987-05-26
•
Expires: 2005-07-15
Abstract
Abstract Unsaturated esters of carboxylic acids are prepared by reacting olefines or cycloolefines with carboxylic acids and oxygen in the gaseous phase in the presence of a catalyst containing noble metal salts or noble metals of the VIII th group of the Periodic System and alcali metal salts and/or alcaline earth metal salts, as activators the content of noble metal being in the range of from 1.2 to 5% by weight and the proportion of the metal fraction of each individual activator to the noble metal content being in the range of from 0.5 to 1 to 3:1.
Inventors
- 👤 Hans Fernholz
- 👤 Hans Krekeler
- 👤 G/u/ nter Roscher
- 👤 Hans-Joachim Schmidt
- 👤 Heinz Schmitz
- 👤 Friedrich Wunder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:01
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/38; B01J23/48; B01J23/52; C; C07; C07C; C07C67/00; C07C67/04; C07C67/05; C07C67/055
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
119 words
A process for the preparation of vinyl acetate comprising reacting ethylene with acetic acid and oxygen in a gaseous phase in the presence of a catalyst supported on silicic acid as a carrier and containing as a noble metal component palladium or a palladium salt, and containing as an activator potassium and cadmium, at a temperature of 100° to 250° C. at a pressure from 2 to 20 atomospheres, wherein the content of palladium in the catalyst is 1.3 to 3 weight percent calculated on an elemental basis and wherein the proportion by elemental weight of potassium to palladium is from 0.8:1 to 1.0:1 and the proportion by elemental weight of cadmium to palladium is from 0.7:1 to 2:1.
Claim 2
Dependent Claim
119 words
A process for the preparation of vinyl acetate comprising reacting ethylene with acetic acid and oxygen in a gaseous phase in the presence of a catalyst supported on silicic acid as a carrier and containing as a noble metal component palladium or a palladium salt, and containing as an activator potassium and cadmium, at a temperature of 100° to 250° C. at a pressure from 2 to 20 atomospheres, wherein the content of palladium in the catalyst is 1.3 to 3 weight percent calculated on an elemental basis and wherein the proportion by elemental weight of potassium to palladium is from 0.8:1 to 1.0:1 and the proportion by elemental weight of cadmium to palladium is from 0.7:1 to 2:1.
Claim 3
Dependent Claim
41 words
The process, as claimed in claim 1, wherein the content of palladium is 2 to 2.5 weight percent, the proportion of potassium to palladium is from 0.8:1 to 1.0:1 and the proportion of cadmium to palladium is from 0.72:1 to 0.9:1.
Claim 4
Dependent Claim
36 words
The process, as claimed in claim 1, wherein the content of palladium is about 2.5 weight percent, the proportion of potassium to palladium is about 0.8:1 and the proportion of cadmium to palladium is about 0.72:1.
Claim 5
Dependent Claim
36 words
The process, as claimed in claim 1 wherein the content of palladium is about 2.0 weight percent, the proportion of potassium to palladium is about 1.0:1 and the proportion of cadmium to palladium is about 0.9:1.
References Cited (Backward Citations)
CA851745A
Cited
CA902103A
Cited
CA781491A
Cited
GB1017938A
Cited
GB1082845A
Cited
GB1063434A
Cited
US3761513A
Cited
US3567767A
Cited
GB1128993A
Cited
US3546278A
Cited
GB1211096A
Cited
GB1203953A
Cited
US3625998A
Cited
US3658888A
Cited
US3847972A
Cited
US3634496A
Cited
US3759839A
Cited
GB1209125A
Cited
US3670014A
Cited
GB1269742A
Cited
US3950400A
Cited
US3917676A
Cited
US3939199A
Cited
DE2100778A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-05-25 | 1990-11-24 | 1991-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-25 | 1994-11-24 | 1995-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-25 | 1998-11-24 | 1999-05-26 | $7700.00 | Window Closed / Lapsed |