US4285875A
Expired / Lapsed
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Process for preparing carboxylic acids by catalytic oxidation of aldehydes
Assignee: Hoechst AG
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Filing: 1980-07-28
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Granted: 1981-08-25
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Expires: 2000-07-28
Abstract
Abstract A process for preparing carboxylic acids by the oxidative conversion of the corresponding aldehydes comprises oxidizing the aldehydes in the presence of a catalyst comprising the anion [Fe(CN) 5 H 2 O] -3 . The catalyst may be selected from [Fe(CN) 5 H 2 O] -3 , compounds that form [Fe(CN) 5 H 2 O] -3 under the reaction conditions, and their salts. The catalyst is useful for the oxidation of aldehydes with oxygen or oxygen-containing gases. The present process permits the use of lower reaction times and temperatures, and reduces the formation of undesirable reaction by-products.
Inventors
- 👤 Boy Cornils
- 👤 Werner De Win
- 👤 Jurgen Weber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:53
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/23; C07C51/235
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
27 words
A process for preparing carboxylic acids comprising reacting the corresponding aldehyde in the presence of a catalyst comprising the anion [Fe(CN) 5 H 2 O] -3 .
Claim 2
Dependent Claim
27 words
A process for preparing carboxylic acids comprising reacting the corresponding aldehyde in the presence of a catalyst comprising the anion [Fe(CN) 5 H 2 O] -3 .
Claim 3
Dependent Claim
16 words
The process of claim 1 wherein said aldehydes are selected from straight chain and branched-chain aldehydes.
Claim 4
Dependent Claim
24 words
The process of claim 1 wherein said straight chain and branched-chain aldehydes are selected from aliphatic aldehydes, cycloaliphatic aldehydes, araliphatic aldehydes and aromatic aldehydes.
Claim 5
Dependent Claim
15 words
The process of claim 2 wherein said aldehydes have from 4 to 10 carbon atoms.
Claim 6
Dependent Claim
12 words
The process of claim 2 wherein said aldehydes are α-branched-chain aliphatic aldehydes.
Claim 7
Dependent Claim
34 words
The process of claim 1 wherein said catalyst is selected from [Fe(CN) 5 H 2 O] -3 , compounds that form [Fe(CN) 5 H 2 O] -3 under the reaction conditions, and salts thereof.
Claim 8
Dependent Claim
16 words
The process of claim 6 wherein said catalyst comprises Na 3 [Fe(CN) 5 H 2 O].
Claim 9
Dependent Claim
23 words
The process of claim 6 wherein the compound that forms [Fe(CN) 5 H 2 O] -3 under the reaction conditions is sodium-iron (II)-ammine-pentacyanide-trihydrate.
Claim 10
Dependent Claim
22 words
The process of claim 1 wherein said catalyst is present in an amount of at least 0.05% by weight of said aldehyde.
Claim 11
Dependent Claim
23 words
The process of claim 9 wherein said catalyst is present in an amount of from 0.1% to 2% by weight of said aldehyde.
Claim 12
Dependent Claim
18 words
The process of claim 1 wherein said aldehyde is reacted at a temperature up to about 50° C.
Claim 13
Dependent Claim
21 words
The process of claim 11 wherein said aldehyde is reacted at a temperature up to 20° C. to about 50° C.
Claim 14
Dependent Claim
21 words
The process of claim 1 wherein said aldehyde is reacted for a period of time of up to about 6 hours.
Claim 15
Dependent Claim
19 words
The process of claim 1 wherein prior to reacting said aldehyde, said catalyst is at least partially dissolved therein.
Claim 16
Dependent Claim
12 words
The process of claim 14 further including the presence of a solvent.
Claim 17
Dependent Claim
22 words
The process of claim 15 wherein said solvent is selected from aliphatic hydrocarbons, aromatic hydrocarbons, aliphatic carboxylic acids and aromatic carboxylic acids.
Claim 18
Dependent Claim
27 words
The process of claim 1 wherein said aldehyde is oxidized by contact with a source of oxygen selected from gaseous O 2 and an oxygen-containing gas mixture.
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) | 1984-08-24 | 1985-02-23 | 1985-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-24 | 1989-02-23 | 1989-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-24 | 1993-02-23 | 1993-08-25 | $7700.00 | Window Closed / Lapsed |