US4515904A
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: 1983-09-30
•
Granted: 1985-05-07
•
Expires: 2003-09-30
Abstract
Abstract A process for the manufacture of a phosphorus-vanadium and phosphorus-vanadium-co-metal catalysts suitable for use in the manufacture of maleic anhydride from butane which process comprises reacting at a temperature of about 0° C. to about 200° C. a vanadium compound in an organic ether solvent having about 2 to about 10 carbon atoms with a phosphoryl halide in the presence of water or an aliphatic alcohol having from about 1 to about 8 carbon atoms, eliminating the solvent and activating the catalyst by the addition of butane or other hydrocarbon feedstock and a phosphorus compound at a temperature of about 300° C. to about 500° C. The catalysts are useful for the manufacture of maleic anhydride from butane feedstock.
Inventors
- 👤 Robert C. Edwards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:06
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; B01J27/199; B01J35/00; B01J35/60; B01J35/61; B01J35/613; B01J35/63; B01J35/633; B01J2523/00; B01J35/30; B01J35/34; B01J35/37
Claims Analysis
Total Claims: 52
Claim 1
Independent Claim
106 words
A process for the manufacture of a phosphorus-vanadium oxide catalyst suitable for use in the manufacture of maleic anhydride from butane which process comprises reacting at a temperature of about 0° C. to about 200° C. a vanadium compound in an organic ether solvent having from about 2 to about 10 carbon atoms, with a phosphoryl halide in the presence of water or an aliphatic alcohol having from about 1 to about 8 carbon atoms, eliminating the solvent and activating the catalyst by the addition of butane or another hydrocarbon feedstock and a phosphorus compound at a temperature of about 300° C. to about 500° C.
Claim 2
Dependent Claim
106 words
A process for the manufacture of a phosphorus-vanadium oxide catalyst suitable for use in the manufacture of maleic anhydride from butane which process comprises reacting at a temperature of about 0° C. to about 200° C. a vanadium compound in an organic ether solvent having from about 2 to about 10 carbon atoms, with a phosphoryl halide in the presence of water or an aliphatic alcohol having from about 1 to about 8 carbon atoms, eliminating the solvent and activating the catalyst by the addition of butane or another hydrocarbon feedstock and a phosphorus compound at a temperature of about 300° C. to about 500° C.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein the vanadium compound is vanadium pentoxide.
Claim 4
Dependent Claim
10 words
The process of claim 1 wherein the ether is tetrahydrofuran.
Claim 5
Dependent Claim
126 words
A process for the manufacture of a phosphorus-vanadium oxide catalyst suitable for use in the manufacture of maleic anhydride from butane which process comprises reacting at a temperature of about 0° C. to about 200° C. a vanadium compound in an organic ether solvent having from about 2 to about 10 carbon atoms, with a phosphoryl chloride in the presence of water or an aliphatic alcohol having from about 1 to about 8 carbon atoms, wherein the phosphorus-vanadium oxide catalyst is dissolved and the dissolved phosphorus-vanadium oxide catalyst is solidified by evaporation or distillation of the organic solvent and activating the catalyst by the addition of butane or another hydrocarbon feedstock and a phosphorus compound at a temperature of about 300° C. to about 500° C.
Claim 6
Dependent Claim
126 words
A process for the manufacture of a phosphorus-vanadium oxide catalyst suitable for use in the manufacture of maleic anhydride from butane which process comprises reacting at a temperature of about 0° C. to about 200° C. a vanadium compound in an organic ether solvent having from about 2 to about 10 carbon atoms, with a phosphoryl chloride in the presence of water or an aliphatic alcohol having from about 1 to about 8 carbon atoms, wherein the phosphorus-vanadium oxide catalyst is dissolved and the dissolved phosphorus-vanadium oxide catalyst is solidified by evaporation or distillation of the organic solvent and activating the catalyst by the addition of butane or another hydrocarbon feedstock and a phosphorus compound at a temperature of about 300° C. to about 500° C.
Claim 7
Dependent Claim
108 words
A process for the manufacture of a phosphorus-vanadium oxide catalyst suitable for use in the manufacture of maleic anhydride from butane which process comprises reacting at a temperature of about 0° C. to about 200° C. a vanadium compound in an organic ether solvent having from about 2 to about 10 carbon atoms, with a phosphoryl chloride in the presence of water or an aliphatic alcohol having from about 1 to about 8 carbon atoms, eliminating the solvent and activating the catalyst by the addition of butane or another hydrocarbon feedstock and an alkylester of orthophosphoric acid at a temperature of about 300° C. to about 500° C.
Claim 8
Dependent Claim
108 words
A process for the manufacture of a phosphorus-vanadium oxide catalyst suitable for use in the manufacture of maleic anhydride from butane which process comprises reacting at a temperature of about 0° C. to about 200° C. a vanadium compound in an organic ether solvent having from about 2 to about 10 carbon atoms, with a phosphoryl chloride in the presence of water or an aliphatic alcohol having from about 1 to about 8 carbon atoms, eliminating the solvent and activating the catalyst by the addition of butane or another hydrocarbon feedstock and an alkylester of orthophosphoric acid at a temperature of about 300° C. to about 500° C.
Claim 9
Dependent Claim
40 words
The process of claim 5 wherein the alkylester of orthophosphoric acid has the following structure: (RO).sub.3 P═O wherein R is hydrogen or C 1 to C 4 alkyl, at least one R being a C 1 to C 4 alkyl.
Claim 10
Dependent Claim
10 words
The process of claim 6 wherein the alkyester is triethylphosphate.
Claim 11
Dependent Claim
10 words
The process of claim 6 wherein the alkylester is trimethylphosphate.
Claim 12
Dependent Claim
105 words
A process for the manufacture of a phosphorus-vanadium-co-metal oxide catalyst suitable for use in the manufacture of maleic anhydride from butane which process comprises reacting at a temperature of about 0° C. to about 200° C. a vanadium compound in an organic ether solvent having about 2 to about 10 carbon atoms with a phosphoryl halide in the presence of water or an aliphatic alcohol having from about 1 to about 8 carbon atoms, eliminating the solvent and activating the catalyst by the addition of butane or another hydrocarbon feedstock and a phosphorus compound at a temperature of about 300° C. to about 500° C.
Claim 13
Dependent Claim
105 words
A process for the manufacture of a phosphorus-vanadium-co-metal oxide catalyst suitable for use in the manufacture of maleic anhydride from butane which process comprises reacting at a temperature of about 0° C. to about 200° C. a vanadium compound in an organic ether solvent having about 2 to about 10 carbon atoms with a phosphoryl halide in the presence of water or an aliphatic alcohol having from about 1 to about 8 carbon atoms, eliminating the solvent and activating the catalyst by the addition of butane or another hydrocarbon feedstock and a phosphorus compound at a temperature of about 300° C. to about 500° C.
Claim 14
Dependent Claim
12 words
The process of claim 9 wherein the vanadium compound is vanadium pentoxide.
Claim 15
Dependent Claim
10 words
The process of claim 9 wherein the ether is tetrahydrofuran.
Claim 16
Dependent Claim
125 words
A process for the manufacture of a phosphorus-vanadium-co-metal oxide catalyst suitable for use in the manufacture of maleic anhydride from butane which process comprises reacting at a temperature of about 0° C. to about 200° C. a vanadium compound in an organic ether solvent having about 2 to about 10 carbon atoms with a phosphoryl chloride in the presence of water or an aliphatic alcohol having from about 1 to about 8 carbon atoms, wherein the phosphorus-vanadium-co-metal oxide catalyst is dissolved and the dissolved phosphorus-vanadium-co-metal oxide catalyst is solidified by evaporation or distillation of the organic solvent and activating the catalyst by the addition of butane or another hydrocarbon feedstock and a phosphorus compound at a temperature of about 300° C. to about 500° C.
Claim 17
Dependent Claim
125 words
A process for the manufacture of a phosphorus-vanadium-co-metal oxide catalyst suitable for use in the manufacture of maleic anhydride from butane which process comprises reacting at a temperature of about 0° C. to about 200° C. a vanadium compound in an organic ether solvent having about 2 to about 10 carbon atoms with a phosphoryl chloride in the presence of water or an aliphatic alcohol having from about 1 to about 8 carbon atoms, wherein the phosphorus-vanadium-co-metal oxide catalyst is dissolved and the dissolved phosphorus-vanadium-co-metal oxide catalyst is solidified by evaporation or distillation of the organic solvent and activating the catalyst by the addition of butane or another hydrocarbon feedstock and a phosphorus compound at a temperature of about 300° C. to about 500° C.
Claim 18
Dependent Claim
106 words
A process for the manufacture of a phosphorus-vanadium-co-metal oxide catalyst suitable for use in the manufacture of maleic anhydride from butane which process comprises reacting at a temperature of about 0° C. to about 200° C. a vanadium compound in an organic ether solvent having about 2 to about 10 carbon atoms with phosphoryl chloride in the presence of water or an aliphatic alcohol having from about 1 to about 8 carbon atoms, eliminating the solvent and activating the catalyst by the addition of butane or another hydrocarbon feedstock and an alkylester of orthophosphoric acid at a temperature of about 300° C. to about 500° C.
Claim 19
Dependent Claim
106 words
A process for the manufacture of a phosphorus-vanadium-co-metal oxide catalyst suitable for use in the manufacture of maleic anhydride from butane which process comprises reacting at a temperature of about 0° C. to about 200° C. a vanadium compound in an organic ether solvent having about 2 to about 10 carbon atoms with phosphoryl chloride in the presence of water or an aliphatic alcohol having from about 1 to about 8 carbon atoms, eliminating the solvent and activating the catalyst by the addition of butane or another hydrocarbon feedstock and an alkylester of orthophosphoric acid at a temperature of about 300° C. to about 500° C.
Claim 20
Dependent Claim
40 words
The process of claim 13 wherein the alkylester of orthophosphoric acid has the following structure: (RO).sub.3 P═O wherein R is hydrogen or C 1 to C 4 alkyl, at least one R being a C 1 to C 4 alkyl.
Claim 21
Dependent Claim
10 words
The process of claim 14 wherein the alkyester is triethylphosphate.
Claim 22
Dependent Claim
10 words
The process of claim 14 wherein the alkylester is trimethylphosphate.
Claim 23
Dependent Claim
105 words
A process for the manufacture of a phosphorus-vanadium-co-molybdenum oxide catalyst suitable for use in the manufacture of maleic anhydride from butane which process comprises reacting at a temperature of about 0° C. to about 200° C. a vanadium compound in an organic ether solvent having about 2 to about 10 carbon atoms with a phosphoryl chloride in the presence of water or an aliphatic alcohol having from about 1 to about 8 carbon atoms, eliminating the solvent and activating the catalyst by the addition of butane or another hydrocarbon feedstock and a phosphorus compound at a temperature of about 300° C. to about 500° C.
Claim 24
Dependent Claim
105 words
A process for the manufacture of a phosphorus-vanadium-co-molybdenum oxide catalyst suitable for use in the manufacture of maleic anhydride from butane which process comprises reacting at a temperature of about 0° C. to about 200° C. a vanadium compound in an organic ether solvent having about 2 to about 10 carbon atoms with a phosphoryl chloride in the presence of water or an aliphatic alcohol having from about 1 to about 8 carbon atoms, eliminating the solvent and activating the catalyst by the addition of butane or another hydrocarbon feedstock and a phosphorus compound at a temperature of about 300° C. to about 500° C.
Claim 25
Dependent Claim
12 words
The process of claim 17 wherein the vanadium compound is vanadium pentoxide.
Claim 26
Dependent Claim
10 words
The process of claim 17 wherein the ether is tetrahydrofuran.
Claim 27
Dependent Claim
110 words
A process for the manufacture of a phosphorus-vanadium-molybdenum oxide catalyst suitable for use in the manufacture of maleic anhydride from butane which process comprises reacting at a temperature of about 0° C. to about 200° C. a vanadium compound in an organic ether solvent having about 2 to about 10 carbon atoms with an alkylester of orthophosphoric acid in the presence of water or an aliphatic alcohol having from about 1 to about 8 carbon atoms, eliminating the solvent and activating the catalyst by the addition of butane or another hydrocarbon feedstock and an alkyl ester of orthophosphoric acid at a temperature of about 300° C. to about 500° C.
Claim 28
Dependent Claim
110 words
A process for the manufacture of a phosphorus-vanadium-molybdenum oxide catalyst suitable for use in the manufacture of maleic anhydride from butane which process comprises reacting at a temperature of about 0° C. to about 200° C. a vanadium compound in an organic ether solvent having about 2 to about 10 carbon atoms with an alkylester of orthophosphoric acid in the presence of water or an aliphatic alcohol having from about 1 to about 8 carbon atoms, eliminating the solvent and activating the catalyst by the addition of butane or another hydrocarbon feedstock and an alkyl ester of orthophosphoric acid at a temperature of about 300° C. to about 500° C.
Claim 29
Dependent Claim
40 words
The process of claim 20 wherein the alkylester of orthophosphoric acid has the following structure: (RO).sub.3 P═O wherein R is hydrogen or C 1 to C 4 alkyl, at least one R being a C 1 to C 4 alkyl.
Claim 30
Dependent Claim
10 words
The process of claim 21 wherein the alkylester is triethylphosphate.
Claim 31
Dependent Claim
10 words
The process of claim 21 wherein the alkylester is trimethylphosphate.
Claim 32
Dependent Claim
105 words
A process for the manufacture of a phosphorus-vanadium-zinc oxide catalyst suitable for use in the manufacture of maleic anhydride from butane which process comprises reacting at a temperature of about 0° C. to about 200° C. a vanadium compound in an organic ether solvent having about 2 to about 10 carbon atoms with a phosphoryl chloride in the presence of water or an aliphatic alcohol having from about 1 to about 8 carbon atoms, eliminating the solvent and activating the catalyst by the addition of butane or another hydrocarbon feedstock and a phosphorus compound at a temperature of about 300° C. to about 500° C.
Claim 33
Dependent Claim
105 words
A process for the manufacture of a phosphorus-vanadium-zinc oxide catalyst suitable for use in the manufacture of maleic anhydride from butane which process comprises reacting at a temperature of about 0° C. to about 200° C. a vanadium compound in an organic ether solvent having about 2 to about 10 carbon atoms with a phosphoryl chloride in the presence of water or an aliphatic alcohol having from about 1 to about 8 carbon atoms, eliminating the solvent and activating the catalyst by the addition of butane or another hydrocarbon feedstock and a phosphorus compound at a temperature of about 300° C. to about 500° C.
Claim 34
Dependent Claim
12 words
The process of claim 24 wherein the vanadium compound is vanadium pentoxide.
Claim 35
Dependent Claim
10 words
The process of claim 24 wherein the ether is tetrahydrofuran.
Claim 36
Dependent Claim
105 words
A process for the manufacture of a phosphorus-vanadium-zinc catalyst suitable for use in the manufacture of maleic anhydride from butane which process comprises reacting at a temperature of about 0° C. to about 200° C. a vanadium compound in an organic ether solvent having about 2 to about 10 carbon atoms with phosphoryl chloride in the presence of water or an aliphatic alcohol having from about 1 to about 8 carbon atoms, eliminating the solvent and activating the catalyst by the addition of butane or another hydrocarbon feedstock and an alkylester of orthophosphoric acid at a temperature of about 300° C. to about 500° C.
Claim 37
Dependent Claim
105 words
A process for the manufacture of a phosphorus-vanadium-zinc catalyst suitable for use in the manufacture of maleic anhydride from butane which process comprises reacting at a temperature of about 0° C. to about 200° C. a vanadium compound in an organic ether solvent having about 2 to about 10 carbon atoms with phosphoryl chloride in the presence of water or an aliphatic alcohol having from about 1 to about 8 carbon atoms, eliminating the solvent and activating the catalyst by the addition of butane or another hydrocarbon feedstock and an alkylester of orthophosphoric acid at a temperature of about 300° C. to about 500° C.
Claim 38
Dependent Claim
40 words
The process of claim 27 wherein the alkylester of orthophosphoric acid has the following structure: (RO).sub.3 P═O wherein R is hydrogen or C 1 to C 4 alkyl, at least one R being a C 1 to C 4 alkyl.
Claim 39
Dependent Claim
10 words
The process of claim 27 wherein the alkylester is triethylphosphate.
Claim 40
Dependent Claim
10 words
The process of claim 27 wherein the alkylester is trimethylphosphate.
Claim 41
Dependent Claim
133 words
A process for the manufacture of a phosphorus-vanadium oxide catalyst suitable for use in the manufacture of maleic anhydride from butane with process comprises reacting at a temperature of about 0° C. to about 200° C. a vanadium compound in an organic ether solvent having from about 2 to about 10 carbon atoms, with a phosphoryl chloride in the presence of water or an aliphatic alcohol having from about 1 to about 8 carbon atoms, eliminating the solvent and activating the catalyst at a temperature of about 300° C. to about 500° C. by the addition of butane or another hydrocarbon feedstock and a 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 H or R.
Claim 42
Dependent Claim
133 words
A process for the manufacture of a phosphorus-vanadium oxide catalyst suitable for use in the manufacture of maleic anhydride from butane with process comprises reacting at a temperature of about 0° C. to about 200° C. a vanadium compound in an organic ether solvent having from about 2 to about 10 carbon atoms, with a phosphoryl chloride in the presence of water or an aliphatic alcohol having from about 1 to about 8 carbon atoms, eliminating the solvent and activating the catalyst at a temperature of about 300° C. to about 500° C. by the addition of butane or another hydrocarbon feedstock and a 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 H or R.
Claim 43
Dependent Claim
132 words
A process for the manufacture of a phosphorus-vanadium-co-metal oxide catalyst suitable for use in the manufacture of maleic anhydride from butane which process comprises reacting at a temperature of about 0° C. to about 200° C. a vanadium compound in an organic ether solvent having about 2 to about 10 carbon atoms with a phosphoryl chloride in the presence of water or an aliphatic alcohol having from about 1 to about 8 carbon atoms, eliminating the solvent and activating the catalyst at a temperature of about 300° C. to about 500° C. by the addition of butane or another hydrocarbon feedstock and a phosphorus compound selected from the group consisting of: ##STR4## wherein R is phenyl or an alkyl radical of one to 6 carbon atoms and X is H or R.
Claim 44
Dependent Claim
132 words
A process for the manufacture of a phosphorus-vanadium-co-metal oxide catalyst suitable for use in the manufacture of maleic anhydride from butane which process comprises reacting at a temperature of about 0° C. to about 200° C. a vanadium compound in an organic ether solvent having about 2 to about 10 carbon atoms with a phosphoryl chloride in the presence of water or an aliphatic alcohol having from about 1 to about 8 carbon atoms, eliminating the solvent and activating the catalyst at a temperature of about 300° C. to about 500° C. by the addition of butane or another hydrocarbon feedstock and a phosphorus compound selected from the group consisting of: ##STR4## wherein R is phenyl or an alkyl radical of one to 6 carbon atoms and X is H or R.
Claim 45
Dependent Claim
125 words
A process for the manufacture of a phosphorus-vanadium-molybdenum oxide catalyst suitable for use in the manufacture of maleic anhydride from butane which process comprises reacting at a temperature of about 0° C. to about 200° C. a vanadium compound in an organic ether solvent having about 2 to about 10 carbon atoms with a phosphoryl chloride in the presence of water or an aliphatic alcohol having from about 1 to about 8 carbon atoms, wherein the phosphorus-vanadium-molybdenum oxide catalyst is dissolved and the dissolved phosphorus-vanadium-molybdenum oxide catalyst is solidified by evaporation or distillation of the organic solvent and activating the catalyst by the addition of butane or another hydrocarbon feedstock and a phosphorus compound at a temperature of about 300° C. to about 500° C.
Claim 46
Dependent Claim
125 words
A process for the manufacture of a phosphorus-vanadium-molybdenum oxide catalyst suitable for use in the manufacture of maleic anhydride from butane which process comprises reacting at a temperature of about 0° C. to about 200° C. a vanadium compound in an organic ether solvent having about 2 to about 10 carbon atoms with a phosphoryl chloride in the presence of water or an aliphatic alcohol having from about 1 to about 8 carbon atoms, wherein the phosphorus-vanadium-molybdenum oxide catalyst is dissolved and the dissolved phosphorus-vanadium-molybdenum oxide catalyst is solidified by evaporation or distillation of the organic solvent and activating the catalyst by the addition of butane or another hydrocarbon feedstock and a phosphorus compound at a temperature of about 300° C. to about 500° C.
Claim 47
Dependent Claim
131 words
A process for the manufacture of a phosphorus-vanadium-molybdenum oxide catalyst suitable for use in the manufacture of maleic anhydride from butane which process comprises reacting at a temperature of about 0° C. to about 200° C. a vanadium compound in an organic ether solvent having about 2 to about 10 carbon atoms with phosphoryl chloride in the presence of water or an aliphatic alcohol having from about 1 to about 8 carbon atoms, eliminating the solvent and activating the catalyst at a temperature of about 300° C. to about 500° C. by the addition of butane or another hydrocarbon feedstock and a phosphorus compound selected from the group consisting of: ##STR5## wherein R is phenyl or an alkyl radical of one to 6 carbon atoms and X is H or R.
Claim 48
Dependent Claim
131 words
A process for the manufacture of a phosphorus-vanadium-molybdenum oxide catalyst suitable for use in the manufacture of maleic anhydride from butane which process comprises reacting at a temperature of about 0° C. to about 200° C. a vanadium compound in an organic ether solvent having about 2 to about 10 carbon atoms with phosphoryl chloride in the presence of water or an aliphatic alcohol having from about 1 to about 8 carbon atoms, eliminating the solvent and activating the catalyst at a temperature of about 300° C. to about 500° C. by the addition of butane or another hydrocarbon feedstock and a phosphorus compound selected from the group consisting of: ##STR5## wherein R is phenyl or an alkyl radical of one to 6 carbon atoms and X is H or R.
Claim 49
Dependent Claim
125 words
A process for the manufacture of a phosphorus-vanadium-zinc oxide catalyst suitable for use in the manufacture of maleic anhydride from butane which process comprises reacting at a temperature of about 0° C. to about 200° C. a vanadium compound in an organic ether solvent having about 2 to about 10 carbon atoms with a phosphoryl chloride in the presence of water or an aliphatic alcohol having from about 1 to about 8 carbon atoms, wherein the phosphorus-vanadium-zinc oxide catalyst is dissolved and the dissolved phosphorus-vanadium-zinc oxide catalyst is solidified by evaporation or distillation of the organic solvent and activating the catalyst by the addition of butane or another hydrocarbon feedstock and a phosphorus compound at a temperature of about 300° C. to about 500° C.
Claim 50
Dependent Claim
125 words
A process for the manufacture of a phosphorus-vanadium-zinc oxide catalyst suitable for use in the manufacture of maleic anhydride from butane which process comprises reacting at a temperature of about 0° C. to about 200° C. a vanadium compound in an organic ether solvent having about 2 to about 10 carbon atoms with a phosphoryl chloride in the presence of water or an aliphatic alcohol having from about 1 to about 8 carbon atoms, wherein the phosphorus-vanadium-zinc oxide catalyst is dissolved and the dissolved phosphorus-vanadium-zinc oxide catalyst is solidified by evaporation or distillation of the organic solvent and activating the catalyst by the addition of butane or another hydrocarbon feedstock and a phosphorus compound at a temperature of about 300° C. to about 500° C.
Claim 51
Dependent Claim
132 words
A process for the manufacture of a phosphorus-vanadium-zinc oxide catalyst suitable for use in the manufacture of maleic anhydride from butane which process comprises reacting at a temperature of about 0° C. to about 200° C. a vanadium compound in an organic ether solvent having about 2 to about 10 carbon atoms with a phosphoryl chloride in the presence of water or an aliphatic alcohol having from about 1 to about 8 carbon atoms, eliminating the solvent and activating the catalyst at a temperature of about 300° C. to about 500° C. by the addition of butane or another hydrocarbon feedstock and a phosphorus compound selected from the group consisting of: ##STR6## wherein R is phenyl or an alkyl radical of one to 6 carbon atoms and X is H or R.
Claim 52
Dependent Claim
132 words
A process for the manufacture of a phosphorus-vanadium-zinc oxide catalyst suitable for use in the manufacture of maleic anhydride from butane which process comprises reacting at a temperature of about 0° C. to about 200° C. a vanadium compound in an organic ether solvent having about 2 to about 10 carbon atoms with a phosphoryl chloride in the presence of water or an aliphatic alcohol having from about 1 to about 8 carbon atoms, eliminating the solvent and activating the catalyst at a temperature of about 300° C. to about 500° C. by the addition of butane or another hydrocarbon feedstock and a phosphorus compound selected from the group consisting of: ##STR6## wherein R is phenyl or an alkyl radical of one to 6 carbon atoms and X is H or R.
References Cited (Backward Citations)
US3293268A
Cited
US3832359A
Cited
US3985775A
Cited
US3867411A
Cited
US3888886A
Cited
US4132670A
Cited
US4149992A
Cited
US4337174A
Cited
US4154703A
Cited
US4092269A
Cited
US4147661A
Cited
US4151116A
Cited
US4222945A
Cited
US4328126A
Cited
US4283288A
Cited
US4361501A
Cited
US4392986A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-05-06 | 1988-11-05 | 1989-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-06 | 1992-11-05 | 1993-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-06 | 1996-11-05 | 1997-05-07 | $7700.00 | Window Closed / Lapsed |