US4244878A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of maleic anhydride
Assignee: Scientific Design LLC
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Filing: 1978-08-04
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Granted: 1981-01-13
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Expires: 1998-08-04
Abstract
Abstract A catalyst for the oxidation of butane to produce maleic anhydride comprising a substrate containing phosphorus and vanadium, and optionally also containing an activator, is characterized by the presence of at least one post-deposited promoter.
Inventors
- 👤 Joseph X. McDermott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:39
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/14; B01J27/186; B01J27/195; B01J27/198; C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/215
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
79 words
A process for producing maleic anhydride which comprises oxidizing butane with molecular oxygen in the presence of a catalyst comprising an activated substrate containing phosphorus and vanadium, said substrate having a promoter post-deposited upon its surface after said substrate has been activated, said post-deposited promoter component comprising an element selected from the group consisting of magnesium, calcium, scandium, yttrium, lanthanum, cerium, uranium, chromium, manganese, iron, cobalt, nickel, copper, zinc, aluminum, gallium, indium, silicon, germanium, tin, antimony, bismuth and tellurium.
Claim 2
Dependent Claim
79 words
A process for producing maleic anhydride which comprises oxidizing butane with molecular oxygen in the presence of a catalyst comprising an activated substrate containing phosphorus and vanadium, said substrate having a promoter post-deposited upon its surface after said substrate has been activated, said post-deposited promoter component comprising an element selected from the group consisting of magnesium, calcium, scandium, yttrium, lanthanum, cerium, uranium, chromium, manganese, iron, cobalt, nickel, copper, zinc, aluminum, gallium, indium, silicon, germanium, tin, antimony, bismuth and tellurium.
Claim 3
Dependent Claim
37 words
A process as defined in claim 1, wherein said post-deposited promoter component comprises an element selected from the group consisting of magnesium, calcium, lanthanum, cerium, chromium, manganese, iron, cobalt, nickel, zinc, aluminum, gallium, germanium, antimony, and tellurium.
Claim 4
Dependent Claim
29 words
A process as defined in claim 1, wherein said post-deposited promoter component comprises an element selected from the group consisting of magnesium, cerium, zinc, aluminum, gallium, indium, and germanium.
Claim 5
Dependent Claim
25 words
A process as defined in claim 1, wherein said post-deposited promoter component is deposited upon said solid substrate together with compounds of phosphorus or boron.
Claim 6
Dependent Claim
14 words
A process as defined in claim 1, wherein the post-deposited promoter component is zinc.
Claim 7
Dependent Claim
80 words
A process for producing maleic anhydride which comprises oxidizing butane with molecular oxygen in the presence of a catalyst comprising a substrate containing phosphorus and vanadium, said substrate having a promoter post-deposited upon its surface, said post-deposited promoter comprising an element selected from the group consisting of magnesium, calcium, scandium, yttrium, lanthanum, cerium, uranium, chromium, manganese, iron, cobalt, nickel, copper, zinc, aluminum, gallium, indium, silicon, germanium, tin, antimony, bismuth and tellurium, and said substrate further containing an integrally-incorporated promoter component.
Claim 8
Dependent Claim
80 words
A process for producing maleic anhydride which comprises oxidizing butane with molecular oxygen in the presence of a catalyst comprising a substrate containing phosphorus and vanadium, said substrate having a promoter post-deposited upon its surface, said post-deposited promoter comprising an element selected from the group consisting of magnesium, calcium, scandium, yttrium, lanthanum, cerium, uranium, chromium, manganese, iron, cobalt, nickel, copper, zinc, aluminum, gallium, indium, silicon, germanium, tin, antimony, bismuth and tellurium, and said substrate further containing an integrally-incorporated promoter component.
Claim 9
Dependent Claim
42 words
A process as defined in claim 6, wherein the integrally-incorporated promoter component comprises an element selected from the group consisting of titanium, zinc, hafnium, lithium, magnesium, calcium, iron, cobalt, nickel, copper, tin, bismuth, uranium, the rare earth metals, chromium, cadmium and aluminum.
Claim 10
Dependent Claim
14 words
A process as defined in claim 6, wherein the integrally-incorporated promoter component is titanium.
Claim 11
Dependent Claim
21 words
A process as defined in claim 6, wherein the post-deposited promoter component is zinc, and the integrally-incorporated promoter component is titanium.
References Cited (Backward Citations)
US3888886A
Cited
GB1460971A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-13 | 1984-07-14 | 1985-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-13 | 1988-07-14 | 1989-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-13 | 1992-07-14 | 1993-01-13 | $7700.00 | Window Closed / Lapsed |