Patent US4532231A successfully refreshed from Google Patents.
US4532231A
Expired / Lapsed
US
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Process for producing a catalyst
Assignee: Imperial Chemical Industries Ltd
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Filing: 1984-02-13
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Granted: 1985-07-30
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Expires: 2004-02-13
Abstract
Abstract A catalyst for the production of alkylene oxides is produced by impregnating a supported silver composition with a solution of an alkali metal compound. The uniformity of alkali metal distribution is improved by including in the solution at least 20% by weight of a heavy component which is subsequently removed by chemical reaction.
Inventors
- 👤 David W. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:25
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
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
136 words
A process in which a catalyst for the production of an alkylene oxide is produced by impregnating a composition comprising silver supported on a porous heat resisting support with a solution of an alkali metal compound in a liquid which comprises a solvent for the alkali metal compound which comprises at least 20% by weight of a component which can be converted by chemical reaction to gas or vapour only at a temperature below its boiling point or of a substance capable of forming such a component before evaporation, wherein said component is selected from the group consisting of polyethylene glycol, polypropylene glycol or a polyhydroxy compound, and removing the said component by chemical reaction, the boiling point of the said component being higher than the temperature of the said chemical reaction under the reaction conditions.
Claim 2
Dependent Claim
136 words
A process in which a catalyst for the production of an alkylene oxide is produced by impregnating a composition comprising silver supported on a porous heat resisting support with a solution of an alkali metal compound in a liquid which comprises a solvent for the alkali metal compound which comprises at least 20% by weight of a component which can be converted by chemical reaction to gas or vapour only at a temperature below its boiling point or of a substance capable of forming such a component before evaporation, wherein said component is selected from the group consisting of polyethylene glycol, polypropylene glycol or a polyhydroxy compound, and removing the said component by chemical reaction, the boiling point of the said component being higher than the temperature of the said chemical reaction under the reaction conditions.
Claim 3
Dependent Claim
29 words
A process as claimed in claim 1 in which the said component has a melting point above 50° C. and a boiling point above 250° C. at atmospheric pressure.
Claim 4
Dependent Claim
40 words
A process according to claim 1 in which the viscosity of the solution is in the range 5×10 -4 to 5×10 -1 pascal seconds at the temperature of impregnation, the said temperature being in the range 15° to 40° C.
Claim 5
Dependent Claim
25 words
A process as claimed in claim 1, in which the chemical reaction converting the said component to gas or vapour is oxidation with molecular oxygen.
Claim 6
Dependent Claim
29 words
A process as claimed in claim 1 in which the boiling point of the said component is at least 50° C. higher than the temperature of the chemical reaction.
Claim 7
Dependent Claim
30 words
A process as claimed in claim 1 in which a diluent which boils at a temperature at least 50° C. lower than the said component at atmospheric pressure is present.
Claim 8
Dependent Claim
31 words
A process as claimed in claim 6 in which the diluent is a volatile solvent for the alkali metal compound selected from a C 1 to C 4 alcohol and/or water.
Claim 9
Dependent Claim
15 words
A process according to claim 1 in which the alkali metal compound is a carboxylate.
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) | 1988-07-29 | 1989-01-28 | 1989-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-29 | 1993-01-28 | 1993-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-29 | 1997-01-28 | 1997-07-30 | $7700.00 | Window Closed / Lapsed |