Patent US3872134A successfully refreshed from Google Patents.
US3872134A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of anthraquinone
Assignee: BASF SE
•
Filing: 1972-07-11
•
Granted: 1975-03-18
•
Expires: 1992-07-11
Abstract
Abstract Production of anthraquinone by catalytic oxidation of indans with oxygen in the presence of a vanadium (V) compound with one or more than one compound of thallium and antimony. Anthraquinone which can be prepared by the process according to this invention is a valuable starting material for the production of dyes and pesticides.
Inventors
- 👤 Hermann Wistuba
- 👤 Michael Jolyon Sprague
- 👤 Heinz Engelbach
- 👤 Herbert Armbrust
- 👤 Hans-Juergen Sturm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:10
CPC Classifications
C; C07; C07C; C07C46/00; C07C46/02; B; B01; B01J; B01J23/00; B01J23/16; B01J23/20; B01J23/22; C07C51/00; C07C51/16; C07C51/31; C07C51/313
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
34 words
IN A PROCESS FOR THE PRODUCTION OF ANTHRAQUINONE IN THE GAS PHASE IN THE PRESENCE OF A CATALYST AT AN ELEVATED TEMPERATURE OF FROM 250* TO 500*C WHEREIN AN INDAN OF THE FORMULA (1):
Claim 2
Dependent Claim
34 words
IN A PROCESS FOR THE PRODUCTION OF ANTHRAQUINONE IN THE GAS PHASE IN THE PRESENCE OF A CATALYST AT AN ELEVATED TEMPERATURE OF FROM 250* TO 500*C WHEREIN AN INDAN OF THE FORMULA (1):
Claim 3
Dependent Claim
34 words
A process as claimed in claim 1 wherein the said atomic ratios are from 6,000 to 25 of vanadium to 1 of thallium and from 1,600 to 8 of vanadium to 1 of antimony.
Claim 4
Dependent Claim
14 words
A process as claimed in claim 1 carred out at from 300* to 450*C.
Claim 5
Dependent Claim
23 words
A process as claimed in claim 1 wherein the catalyst is calcined at from 450* to 650*C for some time prior to use.
Claim 6
Dependent Claim
18 words
A process as claimed in claim 4 wherein the calcination is carried out at from 500* to 600*C.
Claim 7
Dependent Claim
36 words
A process as claimed in claim 1 wherein the reaction is carried out with a catalyst containing vanadium, thallium or antimony which has been prepared on spherical carriers by a flame spraying or plasma spraying method.
Claim 8
Dependent Claim
29 words
A process as claimed in claim 1 carried out with from 20 to 2,000 grams of starting material (I) per liter of catalyst, or catalyst on carrier, per hour.
Claim 9
Dependent Claim
38 words
A process as claimed in claim 1 carried out with a catalyst applied to a carrier by a flame spraying or plasma spraying method and then heated to a temperature of from 450* to 650*C to undergo calcination.
References Cited (Backward Citations)
US3346659A
Cited
US3699134A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |