US4371702A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vapor phase oxidation of n-butane to maleic anhydride
Assignee: EIDP Inc
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Filing: 1982-02-16
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Granted: 1983-02-01
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Expires: 2002-02-16
Abstract
Abstract Improved vanadium/phosphorus oxide catalyst for the vapor phase oxidation of n-butane to maleic anhydride, and the use of said catalyst to prepare maleic anhydride, said catalyst containing the nonpost-deposited promoter comprising silicon and at least one of indium, antimony and tantalum.
Inventors
- 👤 Tom A. Bither, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:10
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: 13
Claim 1
Independent Claim
106 words
Improved catalytic process for the oxidation of n-butane to maleic anhydride using a vanadium/phosphorus oxide catalyst, the improvement consisting of using a vanadium/phosphorus oxide catalyst containing the promoter comprising silicon and at least one of indium, antimony and tantalum, the Si/V atom ratio being in the range 0.02-3.0:1.0, the (In+Sb+Ta)/V atom ratio being in the range 0.005-0.2:1.0, and the P/V atom ratio being in the range 0.9-1.3:1.0, said catalyst being prepared in an aqueous or organic liquid medium by the procedure wherein the appropriate vanadium species substantially of valence +4 is first contacted with the promoter or promoter precursors and thereafter with the appropriate phosphorus species.
Claim 2
Dependent Claim
106 words
Improved catalytic process for the oxidation of n-butane to maleic anhydride using a vanadium/phosphorus oxide catalyst, the improvement consisting of using a vanadium/phosphorus oxide catalyst containing the promoter comprising silicon and at least one of indium, antimony and tantalum, the Si/V atom ratio being in the range 0.02-3.0:1.0, the (In+Sb+Ta)/V atom ratio being in the range 0.005-0.2:1.0, and the P/V atom ratio being in the range 0.9-1.3:1.0, said catalyst being prepared in an aqueous or organic liquid medium by the procedure wherein the appropriate vanadium species substantially of valence +4 is first contacted with the promoter or promoter precursors and thereafter with the appropriate phosphorus species.
Claim 3
Dependent Claim
14 words
Process of claim 1 wherein the (In+Sb+Ta)/V atom ratio is in the range 0.02-0.12:1.0.
Claim 4
Dependent Claim
14 words
Process of claim 1 wherein the catalyst is prepared in an organic liquid medium.
Claim 5
Dependent Claim
38 words
Process of claim 3 wherein the appropriate vanadium species substantially of valence +4 is first contacted with an appropriate silicon compound and thereafter with an appropriate compound or compounds of at least one of indium, antimony and tantalum.
Claim 6
Dependent Claim
30 words
Process of claim 4 wherein the appropriate compound of silicon and compound or compounds of at least one of indium, antimony and tantalum are soluble in the organic liquid medium.
Claim 7
Dependent Claim
68 words
Improved catalytic process for the oxidation of n-butane to maleic anhydride using a vanadium/phosphorus oxide catalyst, the improvement consisting of using a vanadium/phosphorus oxide catalyst containing the nonpost-deposited promoter comprising silicon and at least one of indium, antimony and tantalum, the Si/V atom ratio being in the range 0.02-3.0:1.0, the (In+Sb+Ta)/V atom ratio being in the range 0.005-0.2:1.0, and the P/V atom ratio being in the range 0.9-1.3:1.0.
Claim 8
Dependent Claim
68 words
Improved catalytic process for the oxidation of n-butane to maleic anhydride using a vanadium/phosphorus oxide catalyst, the improvement consisting of using a vanadium/phosphorus oxide catalyst containing the nonpost-deposited promoter comprising silicon and at least one of indium, antimony and tantalum, the Si/V atom ratio being in the range 0.02-3.0:1.0, the (In+Sb+Ta)/V atom ratio being in the range 0.005-0.2:1.0, and the P/V atom ratio being in the range 0.9-1.3:1.0.
Claim 9
Dependent Claim
14 words
Process of claim 6 wherein the (In+Sb+Ta)/V atom ratio is in the range 0.02-0.12:1.0.
Claim 10
Dependent Claim
16 words
Process of claim 6 wherein the catalyst is prepared in an aqueous or organic liquid medium.
Claim 11
Dependent Claim
14 words
Process of claim 8 wherein the catalyst is prepared in an organic liquid medium.
Claim 12
Dependent Claim
42 words
Process of claim 9 wherein, in the catalyst preparation, an appropriate vanadium species substantially of valence +4 is first contacted with an appropriate silicon compound and thereafter with an appropriate compound or compounds of at least one of indium, antimony and tantalum.
Claim 13
Dependent Claim
30 words
Process of claim 10 wherein the appropriate compound of silicon and compound or compounds of at least one of indium, antimony and tantalum are soluble in the organic liquid medium.
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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) | 1986-01-31 | 1986-08-02 | 1987-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-31 | 1990-08-02 | 1991-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-31 | 1994-08-02 | 1995-02-01 | $7700.00 | Window Closed / Lapsed |