Patent US3920734A successfully refreshed from Google Patents.
US3920734A
Expired / Lapsed
US
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Process for the preparation of aromatic carboxylic acids
Assignee: Individual
•
Filing: 1973-08-07
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Granted: 1975-11-18
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Expires: 1993-08-07
Abstract
Abstract A process for preparing aromatic carboxylic acids which comprises contacting an aromatic compound having at least one hydrogen atom attached to a nuclear carbon atom, with carbon monoxide and a member selected from the group consisting of molecular oxygen and a molecular oxygecontaining gas, in the presence of a palladium carboxylate as catalyst.
Inventors
- 👤 Yataro Ichikawa
- 👤 Teizo Yamaji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:46
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/10; C07C51/145; C07C2603/00; C07C2603/02; C07C2603/04; C07C2603/22; C07C2603/24
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
54 words
A PROCESS FOR PREPARING AROMATIC CARBOXYLIC ACIDS WHICH COMPRISES CONTACTING AN AROMATIC COMPOUND HAVING AT LEAST ONE HYDROGEN ATOM ATTACHED TO A NUCLEAR CARBON ATOM, WITH CARBON MONOXIDE AND A MEMBER SELECTED FROM THE GROUP CONSISTING OF MOLECULAR OXYGEN AND A MOLECULAR OXYGEN-CONTAINING GAS, IN THE PRESENCE OF A PALLADIUM CARBOXYLATE AS A CATALYST.
Claim 2
Dependent Claim
54 words
A PROCESS FOR PREPARING AROMATIC CARBOXYLIC ACIDS WHICH COMPRISES CONTACTING AN AROMATIC COMPOUND HAVING AT LEAST ONE HYDROGEN ATOM ATTACHED TO A NUCLEAR CARBON ATOM, WITH CARBON MONOXIDE AND A MEMBER SELECTED FROM THE GROUP CONSISTING OF MOLECULAR OXYGEN AND A MOLECULAR OXYGEN-CONTAINING GAS, IN THE PRESENCE OF A PALLADIUM CARBOXYLATE AS A CATALYST.
Claim 3
Dependent Claim
20 words
The process according to claim 1 wherein said contact is carried out at a temperature in the range of 0*-300*C.
Claim 4
Dependent Claim
20 words
The Process according to claim 2, wherein said contact is carried out at a temperature in the range of 30*-250*C.
Claim 5
Dependent Claim
28 words
The process according to claim 1 wherein a molar ratio of carbon monoxide (CO) to molecular oxygen (O2) in the range of 10: 90 to 90:10 is used.
Claim 6
Dependent Claim
34 words
The process according to claim 1 which comprises maintaining the partial pressure of the carbon monoxide (CO) as well as that of the molecular oxygen (O2) at a pressure of at least 0.1 atmosphere.
Claim 7
Dependent Claim
40 words
The process according to claim 1 which comprises using as said palladium carboxylate a member selected from the group consisting of the carbonate and the organic carboxylates of palladium, said salts being at least partly soluble in the reaction mixture.
Claim 8
Dependent Claim
56 words
The process according to claim 1 which comprises using as said palladium carboxylate a palladium salt of an organic carboxylic acid, said organic carboxylic acid being an acid selected from the group consisting of the saturated and unsaturated organic carboxylic acids of 2-20 carbon atoms, said salt being at least partly soluble in the reaction mixture.
Claim 9
Dependent Claim
30 words
The process according to claim 1 wherein said palladium carboxylate is present in an amount ranging from at least 0.0001 mol to 50 mols per mol of said aromatic compound.
Claim 10
Dependent Claim
21 words
The process according to claim 1 wherein said aromatic compound is selected from the group consisting of naphthalene and naphthoic acid.
Claim 11
Dependent Claim
83 words
The process according to claim 1 wherein said contact is carried out in a medium which is selected from at least one of the group consisting of organic carboxylic acids, carboxylic acid anhydrides, carboxylic acid esters, ethers, ketones, alcohols, nitriles, organic halides, and aliphatic or alicyclic hydrocarbons; with the proviso that the medium is liquid under the reaction conditions and does not have an adverse effect on the reaction; said medium being present in an amount at least sufficient to form a slurry.
Claim 12
Dependent Claim
28 words
The process according to claim 8 wherein said palladium carboxylate catalyst is present in an amount ranging from 0.001 to 10 mols per mol of said aromatic compound.
Claim 13
Dependent Claim
20 words
The process according to claim 3 wherein said contact is carried out at a temperature in the range of 50*-200*C.
Claim 14
Dependent Claim
17 words
The process according to claim 5 wherein a parTial pressure of at least 0.5 atmosphere is maintained.
Claim 15
Dependent Claim
24 words
The process according to claim 7 wherein the catalyst is the palladium salt of an aliphatic monocarboxylic acid having 2 to 4 carbon atoms.
References Cited (Backward Citations)
US3700729A
Cited
US3578716A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |