US4169099A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst and process for producing ethylene oxide
Assignee: Scientific Design LLC
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Filing: 1978-05-25
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Granted: 1979-09-25
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Expires: 1998-05-25
Abstract
Abstract In the oxidation of ethylene with molecular oxygen, improved selectivity to the production of ethylene oxide is obtained by employing a silver catalyst containing greater than zero and up to about 300 ppm by weight of thallium, based on the total catalyst.
Inventors
- 👤 Sargis Khoobiar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:25
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: 10
Claim 1
Independent Claim
51 words
A supported silver catalyst for production of ethylene oxide by oxidation of ethylene with molecular oxygen wherein the improvement consists essentially of increasing the selectivity of said catalyst for production of ethylene oxide by including greater than zero and up to 300 ppm by weight of thallium based on said catalyst.
Claim 2
Dependent Claim
51 words
A supported silver catalyst for production of ethylene oxide by oxidation of ethylene with molecular oxygen wherein the improvement consists essentially of increasing the selectivity of said catalyst for production of ethylene oxide by including greater than zero and up to 300 ppm by weight of thallium based on said catalyst.
Claim 3
Dependent Claim
18 words
The catalyst of claim 1 wherein said catalyst includes between 10 and 270 ppm by weight of thallium.
Claim 4
Dependent Claim
18 words
The catalyst of claim 1 wherein said catalyst includes between 70 and 180 ppm by weight of thallium.
Claim 5
Dependent Claim
91 words
A supported silver catalyst for production of ethylene oxide by oxidation of ethylene with molecular oxygen consisting essentially of a support having a surface area less than 1 m 2 /gm and an apparent porosity in the range of 40-60% and 3 to 25 wt % silver as metal deposited on said support, wherein the improvement consists essentially of including greater than zero and up to 300 ppm by weight of thallium as metal deposited on said support, and thereby increasing the selectivity of said catalyst for production of ethylene oxide.
Claim 6
Dependent Claim
91 words
A supported silver catalyst for production of ethylene oxide by oxidation of ethylene with molecular oxygen consisting essentially of a support having a surface area less than 1 m 2 /gm and an apparent porosity in the range of 40-60% and 3 to 25 wt % silver as metal deposited on said support, wherein the improvement consists essentially of including greater than zero and up to 300 ppm by weight of thallium as metal deposited on said support, and thereby increasing the selectivity of said catalyst for production of ethylene oxide.
Claim 7
Dependent Claim
42 words
The catalyst of claim 4 wherein said silver and said thallium are co-deposited on said support from a solution containing compounds of both of said silver and thallium, followed by drying and calcining of said support and silver and thallium deposited thereon.
Claim 8
Dependent Claim
17 words
The catalyst of claim 4 wherein said catalyst includes between 10 and 270 ppm by weight thallium.
Claim 9
Dependent Claim
17 words
The catalyst of claim 4 wherein said catalyst includes between 70 and 180 ppm by weight thallium.
Claim 10
Dependent Claim
22 words
A process for production of ethylene oxide by oxidation of ethylene with molecular oxygen carried out over the catalyst of claim 1.
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) | 1982-09-24 | 1983-03-26 | 1983-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-09-24 | 1987-03-26 | 1987-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-09-24 | 1991-03-26 | 1991-09-25 | $7700.00 | Window Closed / Lapsed |