US4416802A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalysts for the production of maleic anhydride by the oxidation of butane
Assignee: BP Corp North America Inc
•
Filing: 1982-05-26
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Granted: 1983-11-22
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Expires: 2002-05-26
Abstract
Abstract A process for the manufacture of a phosphorus/vanadium/metal oxide catalyst suitable for the oxidation of butane to maleic anhydride can be prepared by reacting in an aqueous medium a vanadium compound, inorganic acid and metal oxide, then adding orthophosphoric acid to form a soluble vanadium phosphorus metal oxide catalyst, removing the acidified water and adding an aliphatic alcohol, removing the alcohol and recovering under vacuum the solid phosphorus vanadium metal oxide catalyst.
Inventors
- 👤 Carl A. Udovich
- 👤 Robert C. Edwards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:33
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/215; B; B01; B01J; B01J23/00; B01J23/002; B01J27/00; B01J27/14; B01J27/186; B01J27/195; B01J27/198; B01J2523/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
94 words
A process for the manufacture of a phosphorus/vanadium/metal oxide catalyst suitable for use in the manufacture of maleic anhydride which process comprises reacting in an aqueous medium, a vanadium compound and inorganic acid and metal oxide, then adding orthophosphoric acid to form a soluble vanadium phosphorus metal oxide catalyst removing the acidified water and adding an aliphatic alcohol having 1 to 8 carbon atoms, removing the alcohol and drying the catalyst syrup under vacuum of about 0 to 300 mm Hg at a temperature of 90° to 120° C. to produce the solid catalyst.
Claim 2
Dependent Claim
94 words
A process for the manufacture of a phosphorus/vanadium/metal oxide catalyst suitable for use in the manufacture of maleic anhydride which process comprises reacting in an aqueous medium, a vanadium compound and inorganic acid and metal oxide, then adding orthophosphoric acid to form a soluble vanadium phosphorus metal oxide catalyst removing the acidified water and adding an aliphatic alcohol having 1 to 8 carbon atoms, removing the alcohol and drying the catalyst syrup under vacuum of about 0 to 300 mm Hg at a temperature of 90° to 120° C. to produce the solid catalyst.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein the vanadium compound is vanadium pentoxide.
Claim 4
Dependent Claim
27 words
The process of claim 2 wherein the alcohol is methanol and the inorganic acid is HCl and the orthophosphoric acid is 85 to 95 percent orthophosphoric acid.
Claim 5
Dependent Claim
12 words
The process of claim 3 wherein the vanadium compound is vanadium pentoxide.
Claim 6
Dependent Claim
98 words
A process for the manufacture of a phosphorus/vanadium/molybdenum oxide catalyst suitable for use in the manufacture of maleic anhydride which process comprises reacting in an aqueous medium vanadium compound and inorganic acid and molybdenum oxide, then adding orthophosphoric acid to form a soluble vanadium phosphorus molybdenum oxide catalyst, removing the acidified water and adding an aliphatic alcohol having 1 to 8 carbon atoms, removing the alcohol and drying the catalyst syrup under vacuum of about 0 to 300 mm Hg at a temperature of about 90° to 120° C. to produce the solid vanadium phosphorus molybdenum oxide catalyst.
Claim 7
Dependent Claim
98 words
A process for the manufacture of a phosphorus/vanadium/molybdenum oxide catalyst suitable for use in the manufacture of maleic anhydride which process comprises reacting in an aqueous medium vanadium compound and inorganic acid and molybdenum oxide, then adding orthophosphoric acid to form a soluble vanadium phosphorus molybdenum oxide catalyst, removing the acidified water and adding an aliphatic alcohol having 1 to 8 carbon atoms, removing the alcohol and drying the catalyst syrup under vacuum of about 0 to 300 mm Hg at a temperature of about 90° to 120° C. to produce the solid vanadium phosphorus molybdenum oxide catalyst.
Claim 8
Dependent Claim
10 words
The process of claim 4 wherein the alcohol is methanol.
Claim 9
Dependent Claim
11 words
The process of claim 6 wherein the inorganic acid is HCl.
Claim 10
Dependent Claim
16 words
The process of claim 7 wherein the orthophosphoric acid is 85 to 95 percent orthophosphoric acid.
References Cited (Backward Citations)
US3385796A
Cited
US3474041A
Cited
US3293268A
Cited
US3832359A
Cited
US3985775A
Cited
US3867411A
Cited
US3888886A
Cited
US3864280A
Cited
US4016105A
Cited
US4149992A
Cited
US4147661A
Cited
US4151116A
Cited
US4251390A
Cited
US4283288A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-11-21 | 1987-05-23 | 1987-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-21 | 1991-05-23 | 1991-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-21 | 1995-05-23 | 1995-11-22 | $7700.00 | Window Closed / Lapsed |