Patent US2698409A successfully refreshed from Google Patents.
Patent US3883573A successfully refreshed from Google Patents.
US3883573A
Expired / Lapsed
US
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Commercial fixed-bed acrylonitrile or methacrylonitrile
Assignee: Standard Oil Co
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Filing: 1973-06-15
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Granted: 1975-05-13
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Expires: 1993-06-15
Abstract
Abstract Very desirable temperature control in the ammoxidation of propylene or isobutylene in a fixed-bed, tubular reactor is obtained by using an oxidation catalyst having two physical forms. The first catalyst which initially contacts the reactants is an essentially inert support having a strongly adhering coat of a catalytic material, and the second catalyst that contacts the reactants after contact with the first catalyst consists essentially of the catalytic material.
Inventors
- 👤 Ernest C Milberger
- 👤 Serge R Dolhyj
- 👤 James F White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:33
CPC Classifications
C; C07; C07C; C07C253/00; C07C253/24; C07C253/26; B; B01; B01J; B01J27/00; B01J27/14; B01J27/186; B01J27/188; B01J27/19; B01J27/192; B01J27/195; B01J8/00; B01J8/02; B01J8/06; B01J2208/00; B01J2208/00008; B01J2208/00017; B01J2208/00106; B01J2208/00168; B01J2208/00212; B01J2208/00256; B01J2208/00796; B01J2208/00823; B01J2208/00858; B01J2208/00876; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
137 words
IN THE PROCESS FOR PREPARING ACRYLONITRILE OR METHACRYLONITRILE BY THE REACTION OF A MIXTURE OF PROPYLENE OR ISOBUTYLENE, AMMONIA AND MOLECULAR OXYGEN IN THE PRESENCE OF AN AMMOXIDATION CATALYST IN A FIXED-BED REACTOR CONTAINING ONE OR MORE TUBES, THE IMPROVEMENT COMPRISING USING TWO CATALYSTS IN EACH OF ONE OR MORE OF THE TUBES OF THE FIXED-BED REACTOR-THE FIRST CATALYST BEING A CATALYST CONSISTING OF AN ESSENTIALLY INERT SUPPORT MATERIAL WITH AN OUTER SURFACE AND COATING OF CATALYTIC MATERIAL STRONGLY ADHERING TO THE OUTER SURFACE OF THE SUPPORT, AND THE SECOND CATALYST BEING A CATALYST CONSISTING ESSENTIALLY OF THE CATALYTIC MATERIAL AND ARRANGING THE CATALYSTS IN THE TUBE OF THE FIXED-BED REACTOR IN SUCH A MANNER THAT THE FIRST CATALYST CONTACTS THE REACTANTS FIRST AND THE SECOND CATALYST CONTACTS THE REACTANTS SUBSEQUENT TO CONTACT WITH THE FIRST CATALYST.
Claim 2
Dependent Claim
137 words
IN THE PROCESS FOR PREPARING ACRYLONITRILE OR METHACRYLONITRILE BY THE REACTION OF A MIXTURE OF PROPYLENE OR ISOBUTYLENE, AMMONIA AND MOLECULAR OXYGEN IN THE PRESENCE OF AN AMMOXIDATION CATALYST IN A FIXED-BED REACTOR CONTAINING ONE OR MORE TUBES, THE IMPROVEMENT COMPRISING USING TWO CATALYSTS IN EACH OF ONE OR MORE OF THE TUBES OF THE FIXED-BED REACTOR-THE FIRST CATALYST BEING A CATALYST CONSISTING OF AN ESSENTIALLY INERT SUPPORT MATERIAL WITH AN OUTER SURFACE AND COATING OF CATALYTIC MATERIAL STRONGLY ADHERING TO THE OUTER SURFACE OF THE SUPPORT, AND THE SECOND CATALYST BEING A CATALYST CONSISTING ESSENTIALLY OF THE CATALYTIC MATERIAL AND ARRANGING THE CATALYSTS IN THE TUBE OF THE FIXED-BED REACTOR IN SUCH A MANNER THAT THE FIRST CATALYST CONTACTS THE REACTANTS FIRST AND THE SECOND CATALYST CONTACTS THE REACTANTS SUBSEQUENT TO CONTACT WITH THE FIRST CATALYST.
Claim 3
Dependent Claim
25 words
The process of claim 1 wherein the catalytic material of the first catalyst and the catalytic material of the second catalyst are substantially the same.
Claim 4
Dependent Claim
17 words
The process of claim 1 wherein the first catalyst contains about 5 to about 60% catalytic material.
Claim 5
Dependent Claim
21 words
The process of claim 1 wherein the reactor tubes contain about 10 to about 80% by volume of the first catalyst.
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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) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |