US4093559A
Expired / Lapsed
US
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Process for the preparation of a palladium catalyst
Assignee: Hoechst AG
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Filing: 1976-03-02
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Granted: 1978-06-06
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Expires: 1996-03-02
Abstract
Abstract A process for the preparation of a palladium catalyst for the oxacylation of olefins in the gaseous phase, which comprises impregnating a catalyst carrier with a solution of a palladium compound drying the catalyst at a temperature of below 90° C until a residual solvent content of less than 8% by weight is attained, and reducing the impregnated catalyst with a gas mixture of inert gas and reducing agent.
Inventors
- 👤 Hans Fernholz
- 👤 Gunter Roscher
- 👤 Hans-Joachim Schmidt
- 👤 Heinz Schmitz
- 👤 Friedrich Wunder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:08
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/02; B01J37/0201; B01J37/0203; B01J23/00; B01J23/38; B01J23/40; B01J23/44; B01J23/54; B01J23/56; B01J23/58; C; C07; C07C; C07C67/00; C07C67/04; C07C67/05; C07C67/055
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
92 words
A process for the preparation of a palladium catalyst for the oxacylation of olefins in the gaseous phase, which comprises impregnating a catalyst carrier with a solution comprising a palladium compound dissolved in an unsubstituted carboxylic acid, drying the catalyst at a temperature below 90° C until a residual solvent content of less than 8% by weight is attained, and thereafter reducing the catalyst in a gaseous phase at a temperature of 40° to 260° C by passing a gas mixture containing an inert gas and a reducing agent over the catalyst.
Claim 2
Dependent Claim
92 words
A process for the preparation of a palladium catalyst for the oxacylation of olefins in the gaseous phase, which comprises impregnating a catalyst carrier with a solution comprising a palladium compound dissolved in an unsubstituted carboxylic acid, drying the catalyst at a temperature below 90° C until a residual solvent content of less than 8% by weight is attained, and thereafter reducing the catalyst in a gaseous phase at a temperature of 40° to 260° C by passing a gas mixture containing an inert gas and a reducing agent over the catalyst.
Claim 3
Dependent Claim
30 words
The process as claimed in claim 1, which comprises using silicic acid, silica gel, silicates, alumosilicates, active charcoal, aluminum oxide, spinels, zirconium oxide, pumice or silicium carbide as catalyst carrier.
Claim 4
Dependent Claim
24 words
The process as claimed in claim 1, wherein the carboxylic acid used as solvent for the palladium compound, contains up to 10 carbon atoms.
Claim 5
Dependent Claim
18 words
The process as claimed in claim 1, which comprises using a carboxylate of palladium as the palladium compound.
Claim 6
Dependent Claim
30 words
The process as claimed in claim 1, wherein the palladium content of the catalyst is from 0.5 to 5% by weight, calculated on the total mass of the carrier catalyst.
Claim 7
Dependent Claim
20 words
The process as claimed in claim 1, which comprises using the carboxylates of alkali or alkaline earth metals as activators.
Claim 8
Dependent Claim
36 words
The process as claimed in claim 1, which comprises using each single activator in an amount corresponding to 0.01 to 4% by weight of the respective metal, calculated on the total mass of the carrier catalyst.
Claim 9
Dependent Claim
17 words
The process as claimed in claim 1, which comprises drying the impregnated catalyst carrier under reduced pressure.
Claim 10
Dependent Claim
21 words
The process as claimed in claim 1, wherein the residual solvent content of the catalyst is less than 6% by weight.
Claim 11
Dependent Claim
17 words
The process as claimed in claim 1, wherein the reduction temperature is from 70° to 200° C.
Claim 12
Dependent Claim
26 words
The process as claimed in claim 1, wherein the mixture of reducing agent and inert gas contains from 0.01 to 50% by volume of reducing agent.
Claim 13
Dependent Claim
25 words
The process as claimed in claim 1, which comprises carrying out the reduction of the catalyst in the reactor in which the olefin is oxacylated.
Claim 14
Dependent Claim
19 words
The process as claimed in claim 12, which comprises using the olefin to be subsequently oxacylated as reducing agent.
Claim 15
Dependent Claim
16 words
The process of claim 1 wherein said solution contains dissolved therein an activator for said catalyst.
Claim 16
Dependent Claim
13 words
The process of claim 1 wherein the catalyst solution includes an inert solvent.
Claim 17
Dependent Claim
90 words
In a process for the preparation of a palladium catalyst supported on a carrier which is suitable for the oxacylation of olefins in the gaseous phase, the improvement comprising impregnating the carrier with a solvent solution of an unsubstituted carboxylic acid containing a palladium compound dissolved therein, drying the impregnated carrier at a temperature below 90° C to a residual solvent content of less than 6% by weight and thereafter reducing the palladium at a temperature of 70° to 200° C. in an inert gas atmosphere containing a reducing agent.
Claim 18
Dependent Claim
90 words
In a process for the preparation of a palladium catalyst supported on a carrier which is suitable for the oxacylation of olefins in the gaseous phase, the improvement comprising impregnating the carrier with a solvent solution of an unsubstituted carboxylic acid containing a palladium compound dissolved therein, drying the impregnated carrier at a temperature below 90° C to a residual solvent content of less than 6% by weight and thereafter reducing the palladium at a temperature of 70° to 200° C. in an inert gas atmosphere containing a reducing agent.
Claim 19
Dependent Claim
12 words
The process of claim 16 wherein the carboxylic acid is acetic acid.
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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) | 1981-06-05 | 1981-12-05 | 1982-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-05 | 1985-12-05 | 1986-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-05 | 1989-12-05 | 1990-06-06 | $7700.00 | Window Closed / Lapsed |