Patent US4668819A successfully refreshed from Google Patents.
US4668819A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of unsaturated esters of carboxylic acids
Assignee: Hoechst AG
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Filing: 1985-07-15
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Granted: 1987-05-26
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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 19:05
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.
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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 |