Patent US4002653A successfully refreshed from Google Patents.
US4002653A
Expired / Lapsed
US
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Manufacture of anthraquinone
Assignee: BASF SE
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Filing: 1975-05-22
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Granted: 1977-01-11
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Expires: 1995-05-22
Abstract
Abstract Anthraquinone is manufactured by oxidation of diphenylmethane compounds in the gas phase, in the presence of vanadium(V) oxide and titanium dioxide in a specific weight ratio. The anthraquinone which may be manufactured by the process of the invention is a valuable starting material for the manufacture of dyes and pesticides.
Inventors
- 👤 Peter Reuter
- 👤 Heinz Eilingsfeld
- 👤 Manfred Patsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:39
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/02; B01J23/00; B01J23/16; B01J23/20; B01J23/22; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J23/88; C; C07; C07C; C07C46/00; C07C46/02
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
203 words
In a process for the manufacture of anthraquinone by oxidation of diphenylmethane derivatives of the formula ##STR4## where the individual radicals R 4 , R 5 and R 6 are identical or different and each is hydrogen or an aliphatic radical, or the two R 5 s together and/or the two R 6 s together are oxo, and/or R 4 and one R 6 are together an aliphatic radical which is substituted methylene or has at least 2 carbon atoms or, if the R 5 s and one R 6 , or one R 5 and the two R 6 s, or the two R 5 s and the two R 6 s can, in each case together, be an aliphatic radical, by means of oxygen in the gas phase in the presence of vanadium(V) compounds as catalysts, at elevated temperature, the improvement comprising: oxidizing a diphenylmethane compound of the formula ##STR5## in which the individual radicals R 1 , R 2 and R 3 are identical or different and each is hydrogen or an aliphatic radical, in the presence of a catalyst which contains titanium dioxide and vanadium pentoxide in a weight ratio vanadium pentoxide: titanium dioxide of from 0.004:l to 0.35:1.
Claim 2
Dependent Claim
203 words
In a process for the manufacture of anthraquinone by oxidation of diphenylmethane derivatives of the formula ##STR4## where the individual radicals R 4 , R 5 and R 6 are identical or different and each is hydrogen or an aliphatic radical, or the two R 5 s together and/or the two R 6 s together are oxo, and/or R 4 and one R 6 are together an aliphatic radical which is substituted methylene or has at least 2 carbon atoms or, if the R 5 s and one R 6 , or one R 5 and the two R 6 s, or the two R 5 s and the two R 6 s can, in each case together, be an aliphatic radical, by means of oxygen in the gas phase in the presence of vanadium(V) compounds as catalysts, at elevated temperature, the improvement comprising: oxidizing a diphenylmethane compound of the formula ##STR5## in which the individual radicals R 1 , R 2 and R 3 are identical or different and each is hydrogen or an aliphatic radical, in the presence of a catalyst which contains titanium dioxide and vanadium pentoxide in a weight ratio vanadium pentoxide: titanium dioxide of from 0.004:l to 0.35:1.
Claim 3
Dependent Claim
39 words
A process as claimed in claim 1, wherein the oxidation is carried out in the presence of a catalyst which contains titanium dioxide and vanadium pentoxide in a weight ratio vanadium pentoxide: titanium dioxide of from 0.01:1 to 0.1:1.
Claim 4
Dependent Claim
39 words
A process as claimed in claim 1, wherein the oxidation is carried out in the presence of a catalyst which contains titanium dioxide and vandium pentoxide in a weight ratio vanadium pentoxide: titanium dioxide of from 0.02:1 to 0.059:1.
Claim 5
Dependent Claim
39 words
A process as claimed in claim 1 wherein the oxidation is carried out in the presence of a catalyst which contains titanium dioxide and vanadium pentoxide in a weight ratio vanadium pentoxide: titanium dioxide of from 0.02:1 to 0.045:1.
Claim 6
Dependent Claim
27 words
A process as claimed in claim 1, wherein the oxidation is carried out with from 20 to 500 grams of starting material I per liter of catalyst.
Claim 7
Dependent Claim
20 words
A process as claimed in claim 1, wherein the oxidation is carried out with titanium dioxide in the anatase form.
Claim 8
Dependent Claim
36 words
A process as claimed in claim 1, wherein the oxidation is carried out with a catalyst in which the internal surface area of the metal oxides is from 1 to 89 square per gram of catalyst.
Claim 9
Dependent Claim
24 words
A process as claimed in claim 1, wherein the oxidation is carried out with titanium dioxide of particle size from 0.1 to 1.5 microns.
Claim 10
Dependent Claim
48 words
A process as claimed in claim 1, wherein the oxidation is carried out with a supported catalyst containing from 1 to 30 percent by weight of catalytically active material, based on carrier, the thickness of the catalytically active layer on the carrier being from 0.02 to 2 millimeters.
Claim 11
Dependent Claim
19 words
A process as claimed in claim 1, wherein the oxidation is carried out at from 200° to 450° C.
Claim 12
Dependent Claim
19 words
A process as claimed in claim 1, wherein the oxidation is carried out at from 300° to 420° C.
Claim 13
Dependent Claim
36 words
The process set forth in claim 1 wherein the diphenylmethane material I, R 1 , R 2 and R 3 are identical or different and each is hydrogen or alkyl of 1 to 4 carbon atoms.
Claim 14
Dependent Claim
23 words
The process set forth in claim 12 wherein said alkyl group is substituted with additional alkyl group of 1 to 3 carbon atoms.
Claim 15
Dependent Claim
20 words
The process set forth in claim 12 wherein said alkyl is substituted with alkoxy of 1 to 3 carbon atoms.
References Cited (Backward Citations)
US3872134A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-11 | 1980-07-12 | 1981-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-11 | 1984-07-12 | 1985-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-11 | 1988-07-12 | 1989-01-11 | $7700.00 | Window Closed / Lapsed |