US4070379A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of maleic anhydride
Assignee: Norsolor SA
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Filing: 1976-10-21
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Granted: 1978-01-24
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Expires: 1996-10-21
Abstract
Abstract A process for the manufacture of maleic anhydride by the oxidation of benzene with oxygen in the presence of a catalyst which has been previously activated and which comprises an inert support coated with a catalytically active mass containing by weight 10% to 20% of antimony trioxide, 40% to 70% of vanadium pentoxide, 20% to 50% of molybdenum trioxide, 0.7% to 1.5% of phosphorus pentoxide, 0.9% to 2.0% of sodium oxide and possibly another mineral oxide.
Inventors
- 👤 Jean Henri Camille Ciquier
- 👤 Michel Hyppolite Carfantan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:27
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/31; C07C51/313; B; B01; B01J; B01J23/00; B01J23/002; B01J23/16; B01J23/24; B01J23/28; B01J27/00; B01J27/14; B01J27/186; B01J27/195; B01J27/198; B01J27/199; B01J2523/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
93 words
A process for the manufacture of maleic anhydride by the oxidation of benzene with oxygen in the presence of a catalyst which has been previously activated and which comprises an inert support coated with a catalytically active mass containing, by weight, 10% to 20% of antimony trioxide, 40% to 70% of vanadium pentoxide, 20% to 50% of molybdenum trioxide, 0.7% to 1.5% of phosphorus pentoxide, 0.9% to 2.0% of sodium oxide and optionally another mineral oxide selected from the group consisting of, nickel, calcium, iron, silver, strontium, uranium, tungsten, cobalt, and boron oxides.
Claim 2
Dependent Claim
93 words
A process for the manufacture of maleic anhydride by the oxidation of benzene with oxygen in the presence of a catalyst which has been previously activated and which comprises an inert support coated with a catalytically active mass containing, by weight, 10% to 20% of antimony trioxide, 40% to 70% of vanadium pentoxide, 20% to 50% of molybdenum trioxide, 0.7% to 1.5% of phosphorus pentoxide, 0.9% to 2.0% of sodium oxide and optionally another mineral oxide selected from the group consisting of, nickel, calcium, iron, silver, strontium, uranium, tungsten, cobalt, and boron oxides.
Claim 3
Dependent Claim
23 words
A process according to claim 1 in which the catalytically active mass represents 10% to 20% of the total weight of the catalyst.
Claim 4
Dependent Claim
30 words
A process according to claim 1 in which the catalyst is present in the form of spherically or irregularly-shaped grains having an average particle size of 3 to 8 mm.
Claim 5
Dependent Claim
24 words
A process according to claim 1 in which the inert support comprises alumina, silica, silicon carbide, aluminium silicate or a mixture of these compounds.
Claim 6
Dependent Claim
26 words
A process according to claim 1 in which the hot point of the catalyst is maintained at a temperature of from 400° C. to 450° C.
Claim 7
Dependent Claim
23 words
A process according to claim 1 in which the hot point of the catalyst is maintained at a temperature of about 430° C.
Claim 8
Dependent Claim
20 words
A process according to claim 1 in which 10 to 16 moles of oxygen are used per mole of benzene.
Claim 9
Dependent Claim
17 words
A process according to claim 1 in which the oxygen is used in the form of air.
Claim 10
Dependent Claim
25 words
A process according to claim 1 in which the oxygen is used in the form of air at a pressure of up to two atmospheres.
References Cited (Backward Citations)
US3086026A
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US3094539A
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US3115477A
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US3849448A
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US3725472A
Cited
US3702868A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-23 | 1981-07-25 | 1982-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-23 | 1985-07-25 | 1986-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-23 | 1989-07-25 | 1990-01-24 | $7700.00 | Window Closed / Lapsed |