Patent US4212772A successfully refreshed from Google Patents.
US4212772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst for the manufacture of ethylene oxide
Assignee: BASF SE
•
Filing: 1979-04-18
•
Granted: 1980-07-15
•
Expires: 1999-04-18
Abstract
Abstract A novel catalyst for the manufacture of ethylene oxide from ethylene by means of oxygen or air, comprising from 2 to 12% of silver on a conventional carrier, together with from 0.1 to 2 atom% (based on silver) of lithium and from 0.05 to 0.35 atom% of potassium or 0.003 to 0.25 atom% of rubidium or 0.0005 to 0.2 atom% of cesium or mixtures of potassium, rubidium and/or cesium in amounts exhibiting corresponding catalytic activity. The catalyst is advantageously obtained by heating a carrier which is impregnated with a silver complex compound.
Inventors
- 👤 Wolf D. Mross
- 👤 Eckart Titzenthaler
- 👤 Matthias Schwarzmann
- 👤 Juergen Koopmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:03
CPC Classifications
C; C07; C07D; C07D301/00; C07D301/02; C07D301/03; C07D301/04; C07D301/08; C07D301/10; B; B01; B01J; B01J23/00; B01J23/38; B01J23/54; B01J23/66
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
84 words
A catalyst for the manufacture of ethylene oxide by reacting ethylene with oxygen, said catalyst comprising silver and alkali metal compounds on a carrier, in which catalyst are contained, based on the silver present, from 0.1 to 2 atom% of lithium and either from 0.05 to 0.35 atom% of potassium or from 0.003 to 0.25 atom% of rubidium or from 0.0005 to 0.2 atom% of cesium or a mixture of two or more of potassium, rubidium and cesium in amounts exhibiting corresponding catalytic activity.
Claim 2
Dependent Claim
84 words
A catalyst for the manufacture of ethylene oxide by reacting ethylene with oxygen, said catalyst comprising silver and alkali metal compounds on a carrier, in which catalyst are contained, based on the silver present, from 0.1 to 2 atom% of lithium and either from 0.05 to 0.35 atom% of potassium or from 0.003 to 0.25 atom% of rubidium or from 0.0005 to 0.2 atom% of cesium or a mixture of two or more of potassium, rubidium and cesium in amounts exhibiting corresponding catalytic activity.
Claim 3
Dependent Claim
51 words
A catalyst as set forth in claim 1, which has been obtained by applying a thermally decomposable silver compound and appropriate alkali metal compounds to the carrier, in any sequence, and activating the catalyst by heating at temperatures of from 80° to 400° C. and/or by means of a reducing agent.
Claim 4
Dependent Claim
26 words
A catalyst as set forth in claim 1, in which the proportion of silver is from 2 to 12%, based on the weight of the catalyst.
Claim 5
Dependent Claim
59 words
A catalyst as set forth in claim 1, which has been obtained by treating the carrier, impregnated with an aqueous solution of a silver complex salt compound and the alkali metal compounds, with water vapor until the silver complex salt has been decomposed, and then heating the product at from 80° to 400° C. until it reaches constant weight.
Claim 6
Dependent Claim
50 words
A catalyst as set forth in claim 3, wherein the mean particle size of the silver is from 0.2 to 0.4 μm, the surface area of the carrier is 0.1 to 0.5 m 2 /g and the amount of lithium used is from 0.4 to 1.5 atom%, based on silver.
Claim 7
Dependent Claim
33 words
A catalyst as set forth in claim 1, wherein from 0.05 to 0.2 atom% of potassium, from 0.03 to 0.2 atom% of rubidium or from 0.005 to 0.1 atom% of cesium is used.
Claim 8
Dependent Claim
60 words
A catalyst as set forth in claim 1, which has been obtained by treating the carrier, impregnated with an aqueous solution of a silver complex salt compound and the alkali metal compounds, with water vapor until the silver complex begins to decompose and heating the carrier at temperatures of from 150° to 300° C. until a constant weight is reached.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-07-15 | 1984-01-14 | 1984-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-15 | 1988-01-14 | 1988-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-15 | 1992-01-14 | 1992-07-15 | $7700.00 | Window Closed / Lapsed |