Patent US4414135A successfully refreshed from Google Patents.
US4414135A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver-based catalyst containing bromine and/or fluorine as an anionic component for the production of ethylene oxide
Assignee: Mitsubishi Chemical Corp
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Filing: 1982-02-18
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Granted: 1983-11-08
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Expires: 2002-02-18
Abstract
Abstract A catalyst comprising sodium and cesium as a cationic component and at least one of bromine and fluorine as an anionic component in addition to silver which is a typical conventional catalyst component for the production of ethylene oxide by oxidation of ethylene. Use of the catalyst of the invention gives ethylene oxide at an improved selectivity.
Inventors
- 👤 Naohiro Nojiri
- 👤 Yukio Sakai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:03
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/38; B01J23/54; B01J23/66; C; C07; C07D; C07D301/00; C07D301/02; C07D301/03; C07D301/04; C07D301/08; C07D301/10; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
99 words
A catalyst for the production of ethylene oxide by oxidation of ethylene, said catalyst comprising (A) silver, (B) (1) sodium in an amount of more than 1000 ppm (mg/kg of catalyst) based on the catalyst and (2) cesium as a cationic component, the amount of cesium being smaller than that of sodium and ranging from 10 ppm to 0.5% by weight based on the catalyst, and (C) at least one halogen element selected from bromine and fluorine as an anionic component, the amount of the halogen element being from 5 ppm to 0.1% by weight based on the catalyst.
Claim 2
Dependent Claim
99 words
A catalyst for the production of ethylene oxide by oxidation of ethylene, said catalyst comprising (A) silver, (B) (1) sodium in an amount of more than 1000 ppm (mg/kg of catalyst) based on the catalyst and (2) cesium as a cationic component, the amount of cesium being smaller than that of sodium and ranging from 10 ppm to 0.5% by weight based on the catalyst, and (C) at least one halogen element selected from bromine and fluorine as an anionic component, the amount of the halogen element being from 5 ppm to 0.1% by weight based on the catalyst.
Claim 3
Dependent Claim
26 words
The catalyst of claim 1 wherein the amount of sodium is in the range of from 1100 ppm to 1.50% by weight based on the catalyst.
Claim 4
Dependent Claim
26 words
The catalyst of claim 1 wherein the amount of sodium is in the range of from 1200 ppm to 1% by weight based on the catalyst.
Claim 5
Dependent Claim
29 words
The catalyst of claim 1, 2 or 3 wherein the amount of cesium is in the range of from 15 ppm to 0.1% by weight based on the catalyst.
Claim 6
Dependent Claim
34 words
The catalyst of claim 1, 2 or 3 wherein the amount of at least one of halogen element is in the range of from 7 ppm to 0.07 by weight based on the catalyst.
Claim 7
Dependent Claim
45 words
The catalyst of claim 1, 2 or 3 wherein silver, sodium, cesium and bromine and/or fluorine as catalyst ingredients are supported on a porous refractory carrier having a surface area of 0.05 to 10 m 2 /g and an apparent porosity of at least 15%.
Claim 8
Dependent Claim
21 words
The catalyst of claim 1, 2 or 3 wherein the atomic ratio of sodium to silver is not more than 0.58.
Claim 9
Dependent Claim
27 words
The catalyst of claim 1, 2 or 3 wherein the amount of silver in the catalyst is from 1 to 25% by weight, based on the catalyst.
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) | 1986-11-07 | 1987-05-09 | 1987-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-07 | 1991-05-09 | 1991-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-07 | 1995-05-09 | 1995-11-08 | $7700.00 | Window Closed / Lapsed |