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US4351773A
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Preparation of maleic anhydride from butane using fluidized vanadium-phosphorous-oxide containing catalysts
Assignee: Standard Oil Co
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Filing: 1980-12-31
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Granted: 1982-09-28
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Expires: 2000-12-31
Abstract
Abstract A process is provided for the preparation of fluid bed oxidation catalysts containing the mixed oxides of vanadium and phosphorus, comprising the steps of preparing the catalyst precursor, comminuting the precursor, introducing the precursor into water to form an aqueous slurry and spray drying the slurry. The resulting microspheroidal particles are excellent fluid bed catalysts for the preparation of maleic anhydride from 4-carbon atom hydrocarbons.
Inventors
- 👤 Ernest C. Milberger
- 👤 Michael F. Lemanski
- 👤 Gregory G. Spitnale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:46
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/002; B01J27/00; B01J27/14; B01J27/16; B01J27/18; B01J27/186; B01J27/195; B01J27/198; C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/215; C07C51/25; B01J2523/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
118 words
A process for the production of maleic anhydride by the oxidation of n-butane with molecular oxygen or an oxygen-containing gas in a fluid bed reactor at a reaction temperature of about 250° C. to 600° C. in the presence of a microspheroidal, fluidizable catalyst containing the mixed oxides of vanadium and phosphorus, wherein said catalysts is prepared by: (a) preparing a vanadium phosphorus mixed oxide containing catalyst precursor in an organic liquid; (b) comminuting the catalyst precursor to a particle size of less than about one micron average diameter; (c) introducing the catalyst precursor into water prior or subsequent to said comminuting to form an aqueous slurry; and (d) spray drying said slurry to form microspheroidal catalyst particles.
Claim 2
Dependent Claim
118 words
A process for the production of maleic anhydride by the oxidation of n-butane with molecular oxygen or an oxygen-containing gas in a fluid bed reactor at a reaction temperature of about 250° C. to 600° C. in the presence of a microspheroidal, fluidizable catalyst containing the mixed oxides of vanadium and phosphorus, wherein said catalysts is prepared by: (a) preparing a vanadium phosphorus mixed oxide containing catalyst precursor in an organic liquid; (b) comminuting the catalyst precursor to a particle size of less than about one micron average diameter; (c) introducing the catalyst precursor into water prior or subsequent to said comminuting to form an aqueous slurry; and (d) spray drying said slurry to form microspheroidal catalyst particles.
Claim 3
Dependent Claim
16 words
A process as in claim 1, comprising the additional step of calcining the microspheroidal catalyst particles.
Claim 4
Dependent Claim
17 words
A process as in claim 1, wherein said catalyst precursor is prepared in an organic liquid slurry.
Claim 5
Dependent Claim
21 words
A process as in claim 1, wherein the catalyst precursor is substantially dried prior to introducing the catalyst precursor into water.
Claim 6
Dependent Claim
29 words
A process as in claim 1, wherein a substantial portion of said catalyst precursor is comminuted to a particle size of less than about one half micron average diameter.
Claim 7
Dependent Claim
22 words
A process as in claim 1, wherein said aqueous slurry has a solids content of about 25 to about 60 weight percent.
Claim 8
Dependent Claim
23 words
A process as in claim 1, wherein a substantial portion of said microspheroidal particles have a particle size of less than 300 microns.
Claim 9
Dependent Claim
26 words
A process as in claim 1, wherein a substantial portion of said microspheroidal particles have an average diameter of about 20 microns to about 240 microns.
Claim 10
Dependent Claim
30 words
A process as in claim 1, wherein said catalyst precursor additionally comprises promoter elements selected from the group consisting of U, Co, Mo, Fe, Zn, Hf, Zr and mixtures thereof.
Claim 11
Dependent Claim
18 words
A process as in claim 1, wherein said oxidation occurs at a reactor pressure greater than one atmosphere.
Claim 12
Dependent Claim
17 words
A process as in claim 1, wherein said reaction temperature is about 325° C. to 500° C.
Claim 13
Dependent Claim
20 words
A process as in claim 1 wherein said catalyst precursor is introduced into water prior to calcining the catalyst precursor.
References Cited (Backward Citations)
FR2022271A1
Cited
US3888886A
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US3905914A
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US4002650A
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US3931046A
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US3932305A
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US3975300A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-09-27 | 1986-03-29 | 1986-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-27 | 1990-03-29 | 1990-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-27 | 1994-03-29 | 1994-09-28 | $7700.00 | Window Closed / Lapsed |