USRE30430E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst treatment
Assignee: Scientific Design LLC
•
Filing: 1979-02-26
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Granted: 1980-11-04
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Expires: 1999-02-26
Abstract
Abstract Molybdenum - vanadium - oxygen oxidation catalyst for producing maleic anhydride from benzene is regenerated and stabilized by the addition of a compound of Mo, Ni, Co, Mn or U, preferably a volatile compound, to the catalyst, after a decline in activity.
Inventors
- 👤 Ralph O. Kerr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:38
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/28; B01J23/00; B01J23/90; B01J23/92; C; C07; C07C; C07C51/00; C07C51/16; C07C51/31; C07C51/313; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/584
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
102 words
In a process for the vapor phase oxidation of C 4 to C 8 hydrocarbons to dicarboxylic .[.acids.]. .Iadd.anhydrides .Iaddend.wherein said hydrocarbon is contacted with a vanadium-molybdenum-oxygen catalyst wherein said catalyst gradually decreases in activity, the improvement comprising adding to said catalyst, after said decrease in activity, .Iadd.a compound of a phosphorus halide or an organo-phosphorus compound selected from the group consisting of ##STR2##.Iaddend. wherein R is phenyl or an alkyl radical of one to 6 carbon atoms and X is H or R, and thereafter adding to said catalyst a volatilized compound of molybdenum, nickel, cobalt, manganese, uranium or mixtures thereof.
Claim 2
Dependent Claim
102 words
In a process for the vapor phase oxidation of C 4 to C 8 hydrocarbons to dicarboxylic .[.acids.]. .Iadd.anhydrides .Iaddend.wherein said hydrocarbon is contacted with a vanadium-molybdenum-oxygen catalyst wherein said catalyst gradually decreases in activity, the improvement comprising adding to said catalyst, after said decrease in activity, .Iadd.a compound of a phosphorus halide or an organo-phosphorus compound selected from the group consisting of ##STR2##.Iaddend. wherein R is phenyl or an alkyl radical of one to 6 carbon atoms and X is H or R, and thereafter adding to said catalyst a volatilized compound of molybdenum, nickel, cobalt, manganese, uranium or mixtures thereof.
Claim 3
Dependent Claim
26 words
The process according to claim 1 wherein said compound .Iadd.of molybdenum, nickel, cobalt, manganese, uranium, or mixtures thereof .Iaddend.has volatilization temperature of 250° C. or less.
Claim 4
Dependent Claim
23 words
The process according to claim 1 wherein said compound .Iadd.of molybdenum, nickel, cobalt, manganese, uranium, or mixtures thereof .Iaddend.is an inorganic molybdenum compound.
Claim 5
Dependent Claim
36 words
The process according to claim 3 wherein said inorganic compound is molybdenum dibromide, molybdenum tetrabromide, molybdenum tribromide, molybdenum carbonyl, molybdenum pentachloride, molybdenum tetrachloride, molybdenum trichloride, molybdenum hexafluoride, molybdenum oxytetrachloride, molybdenum trichloride, molybdenum oxypentachloride or molybdenum oxytetrafluoride.
Claim 6
Dependent Claim
13 words
The process according to claim 4 wherein said inorganic compound is molybdenum hexafluoride.
Claim 7
Dependent Claim
56 words
The process according to claim .[.3.]. .Iadd.1 .Iaddend.wherein said .[.inorganic.]. compound is molybdenum dibromide, molybdenum tetrabromide, molybdenum tribromide, molybdenum carbonyl, molybdenum pentachloride, molybdenum tetrachloride, molybdenum trichloride, molybdenum hexafluoride, molybdenum oxtetrachloride, molybdenum oxytrichloride, molybdenum oxypentachloride, molybdenum oxytetrafluoride, nickel acetate, nickel carbonyl, nickel nitrate hexahydrate, cobalt nitrosyl carbonyl, manganese nitrate, uranium hexafluoride, uranium tribromide or .[.manyl.]. .Iadd.uranyl .Iaddend.nitrate.
Claim 8
Dependent Claim
77 words
The process according to claim 1 wherein said catalyst has an atomic ratio of molybdenum to vanadium in the range of 0.05 to 0.95 to 1. .[.8. The process according to claim 1 wherein prior to adding said inorganic compound to said catalyst, a compound of a phosphorus halide or an organo-phosphorus compound selected from the group consisting of ##STR3## wherein R is phenyl or an alkyl radical of one to 6 carbon atoms and X is
Claim 9
Dependent Claim
21 words
H or R, is added to said catalyst..]. 9. The process according to claim .[.8.]. .Iadd.1 .Iaddend.wherein said phosphorus compound is
Claim 10
Dependent Claim
9 words
volatilizable. 10. The process according to claim .[.8.]. .Iadd.1
Claim 11
Dependent Claim
42 words
.Iaddend.wherein said inorganic compound is molybdenum hexafluoride. 11. The process according to claim 1 wherein said compound .Iadd.of molybdenum, nickel, cobalt, manganese, uranium or mixtures thereof .Iaddend.is added to said catalyst during the vapor phase oxidation of hydrocarbons to produce dicarboxylic .[.acids.].
Claim 12
Dependent Claim
22 words
.Iadd.anhydrides.Iaddend.. 12. The process according to claim 1 wherein said hydrocarbons have 4 to 6 carbon atoms and said maleic anhydride is
Claim 13
Dependent Claim
12 words
the principal product. 13. The process according to claim 12 wherein the
Claim 14
Dependent Claim
102 words
hydrocarbon is benzene. 14. In a process for oxidizing benzene to maleic anhydride which comprises contacting a vaporous stream of benzene with a vanadium-molybdenum-oxygen catalyst, wherein the yield of maleic anhydride diminishes with time, the improvement comprising adding .Iadd.a volatilized compound of a phosphorus halide or an organo-phosphorus compound selected from the group consisting of ##STR4##.Iaddend. wherein R is phenyl or an alkyl radical of one to 6 carbon atoms and X is H or R, followed by adding a volatilized inorganic molybdenum compound to said vaporous stream of benzene while maintaining said catalyst at a temperature of 340° to 500° C.
Claim 15
Dependent Claim
102 words
hydrocarbon is benzene. 14. In a process for oxidizing benzene to maleic anhydride which comprises contacting a vaporous stream of benzene with a vanadium-molybdenum-oxygen catalyst, wherein the yield of maleic anhydride diminishes with time, the improvement comprising adding .Iadd.a volatilized compound of a phosphorus halide or an organo-phosphorus compound selected from the group consisting of ##STR4##.Iaddend. wherein R is phenyl or an alkyl radical of one to 6 carbon atoms and X is H or R, followed by adding a volatilized inorganic molybdenum compound to said vaporous stream of benzene while maintaining said catalyst at a temperature of 340° to 500° C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-04 | 1984-05-05 | 1984-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-04 | 1988-05-05 | 1988-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-04 | 1992-05-05 | 1992-11-04 | $7700.00 | Window Closed / Lapsed |