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US3943069A
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Process for the production of silver-based catalysts suitable for the production of ethylene oxide
Assignee: Societa Italiana Resine SpA SIR
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Filing: 1973-11-28
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Granted: 1976-03-09
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Expires: 1993-11-28
Abstract
Abstract Silver-based catalysts suitable for the production of ethylene oxide are prepared by impregnating a granular support with a decomposable silver salt, drying the impregnated products, and finally heat-treating the dried product at a high temperature, in a gaseous atmosphere containing at least 1 % by volume of carbon dioxide.
Inventors
- 👤 Giambattista Antonelli
- 👤 Natale Ferlazzo
- 👤 Giancarlo Aglietti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:25
CPC Classifications
C; C07; C07D; C07D301/00; C07D301/02; C07D301/03; C07D301/04; C07D301/08; C07D301/10; B; B01; B01J; B01J23/00; B01J23/38; B01J23/48; B01J23/50; B01J37/00; B01J37/08; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52; Y10; Y10S; Y10S502/00; Y10S502/506; Y10S502/512
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
68 words
A process for the preparation of silver-based catalysts suitable for the production of ethylene oxide, which comprises impregnating a granular support with a decomposable silver salt selected from the group consisting of the salts of lactic, citric, malic and isomalic acids, drying the impregnated products, and finally heat-treating the dried product at a high temperature, in a gaseous atmosphere containing at least 1% by volume of carbon dioxide.
Claim 2
Dependent Claim
68 words
A process for the preparation of silver-based catalysts suitable for the production of ethylene oxide, which comprises impregnating a granular support with a decomposable silver salt selected from the group consisting of the salts of lactic, citric, malic and isomalic acids, drying the impregnated products, and finally heat-treating the dried product at a high temperature, in a gaseous atmosphere containing at least 1% by volume of carbon dioxide.
Claim 3
Dependent Claim
27 words
A process in accordance with claim 1, wherein the heat treatment is carried out in a gaseous atmosphere containing at least 50% by volume of carbon dioxide.
Claim 4
Dependent Claim
24 words
A process in accordance with claim 1, wherein the heat treatment is carried out at a temperature of from about 270° to 350° C.
Claim 5
Dependent Claim
37 words
A process in accordance with claim 1, wherein the heat treatment is carried out at a temperature of from about 290° to 310° C in a gaseous atmosphere containing more than 70% by volume of carbon dioxide.
Claim 6
Dependent Claim
29 words
A process in accordance with claim 1, wherein the heat treatment is carried out in the presence of a gaseous atmosphere containing at least 0.01% by volume of oxygen.
Claim 7
Dependent Claim
27 words
A process in accordance with claim 1, wherein the heat treatment is carried out in a gaseous atmosphere containing about 1 to 20% by volume of oxygen.
Claim 8
Dependent Claim
41 words
A process in accordance with claim 1, wherein during the heat treatment the gaseous atmosphere is recycled through the particles of the catalyst being formed at a rate of from about 10 to 10,000 liters per hour per kg of catalyst.
Claim 9
Dependent Claim
23 words
A process in accordance with claim 1, wherein the treatment is carried out for times from between about 5 to about 10 hours.
Claim 10
Dependent Claim
29 words
A process in accordance with claim 1 wherein during the heat treatment the gaseous atmosphere is maintained at a pressure of from about 1 to 20 kg/cm 2 .
Claim 11
Dependent Claim
19 words
A process in accordance with claim 1, wherein the support materials consist of alumina, silicon carbide, and magnesium oxide.
Claim 12
Dependent Claim
46 words
A process in accordance with claim 1, wherein the support consists of α-alumina having a surface area of from about 0.01 to 1.0 m 2 /gram, a porosity of about 10 to 50 percent, and an average pore diameter of from about 20 to 180 microns.
Claim 13
Dependent Claim
26 words
A process in accordance with claim 1, wherein the support is in the form of spherules having a diameter of from about 4 to 9 mm.
Claim 14
Dependent Claim
54 words
A process in accordance with claim 1, wherein the support is impregnated with the decomposable silver salt with operation at a temperature of from about 60° to 115°C with a quantity of salt such as to ensure a quantity of silver of from about 7 to 30% by weight with respect to the support.
Claim 15
Dependent Claim
41 words
A process in accordance with claim 1, wherein in the impregnation phase, promoters selected from the group consisting of gold, palladium, and platinum are added in quantities of from about 0.01 to 1.0% by weight with respect to the metallic silver.
Claim 16
Dependent Claim
43 words
A process in accordance with claim 1, wherein in the impregnation phase, promoters such as barium and calcium, in the form of salts of lactic acid, are added in quantities of from about 0.1 to 5 moles per 100 gram atoms of silver.
Claim 17
Dependent Claim
32 words
A process in accordance with claim 1, wherein the drying is carried out at temperatures rising to a maximum of about 160°C and for times of from about 1 to 10 hours.
Claim 18
Dependent Claim
32 words
A process in accordance with claim 1, wherein oxygen is added to said gaseous atmosphere in steadily increasing quantities up to an oxygen content of not less than about 0.01% by volume.
Claim 19
Dependent Claim
30 words
A process in accordance with claim 17, wherein the oxygen is added in steadily increasing quantities up to an oxygen content between 1 and 20% by volume over 5-10 hours.
Claim 20
Dependent Claim
33 words
A process in accordance with claim 1, wherein in the impregnation phase promoters selected from the group consisting of palladium on carbon, platinum on carbon and carbon impregnated with colloidal platinum are added.
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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) | 1979-03-09 | 1979-09-08 | 1980-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-09 | 1983-09-08 | 1984-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-09 | 1987-09-08 | 1988-03-09 | $7700.00 | Window Closed / Lapsed |