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Patent US3873632A successfully refreshed from Google Patents.
US3873632A
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Alkylaromatic hydrocarbon isomerization process
Assignee: Universal Oil Products Co
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Filing: 1974-07-22
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Granted: 1975-03-25
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Expires: 1994-07-22
Abstract
Abstract Isomerizable alkylaromatic hydrocarbons are isomerized using a catalytic composite comprising a mordenite component having a SiO2/Al2O3 mole ratio of at least 40:1 prepared by acid extracting Al2O3 from mordenite prepared with an initial SiO2/Al2O3 mole ratio of about 12:1 to about 30:1 and a metal component selected from copper, silver and zirconium.
Inventors
- 👤 Ernest L Pollitzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:05
CPC Classifications
C; C07; C07C; C07C5/00; C07C5/22; C07C5/27; C07C5/2702; C07C5/2724; B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/18; B01J29/20; B01J2229/00; B01J2229/10; B01J2229/16
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
81 words
A PROCESS FOR ISOMERIZING AN ISOMERIZAABLE ALKYLAROMATIC HYDROCARBON WHICH COMPRISES CONTACTING SAID ISOMERIZABLE HYDROCARBON WITH A CATALYST COMPRISING A ZEOLITE COMPONENT HAVING A MORDENITE CRYSTAL STRUCTURE AND HAVING A SILICA TO ALUMINA MOLE RATIO OF AT LEAST 40:1 PREPARED BY ACID EXTRACTING ALUMINA MOLE RATIO OF ABOUT 12:1 TO ABOUT 30:1 AND METAL TO ALUMINA MOLE RATIO OF ABOUT 12:1 TO ABOUT 30:1 AND METAL COMPONENT SELECTED FROM THE GROUP CONSISTING OF COPPER, SILVER, GOLD AND ZIRCONIUM, AT ALKYLAROMATIC ISOMEERIZATION CONDITIONS.
Claim 2
Dependent Claim
81 words
A PROCESS FOR ISOMERIZING AN ISOMERIZAABLE ALKYLAROMATIC HYDROCARBON WHICH COMPRISES CONTACTING SAID ISOMERIZABLE HYDROCARBON WITH A CATALYST COMPRISING A ZEOLITE COMPONENT HAVING A MORDENITE CRYSTAL STRUCTURE AND HAVING A SILICA TO ALUMINA MOLE RATIO OF AT LEAST 40:1 PREPARED BY ACID EXTRACTING ALUMINA MOLE RATIO OF ABOUT 12:1 TO ABOUT 30:1 AND METAL TO ALUMINA MOLE RATIO OF ABOUT 12:1 TO ABOUT 30:1 AND METAL COMPONENT SELECTED FROM THE GROUP CONSISTING OF COPPER, SILVER, GOLD AND ZIRCONIUM, AT ALKYLAROMATIC ISOMEERIZATION CONDITIONS.
Claim 3
Dependent Claim
25 words
The process of claim 1 further characterized in that said metal component comprises about 0.01 weight percent to about 10.0 weight percent of said composition.
Claim 4
Dependent Claim
26 words
The process of claim 1 further characterized in that said zeolite component has a silica to alumina mole ratio of about 50: 1 to about 100:1.
Claim 5
Dependent Claim
28 words
The process of claim 1 further characterized in that said metal component is copper and comprises about 0.1 weight percent to about 5 weight percent of said catalyst.
Claim 6
Dependent Claim
28 words
The process of claim 1 further characterized in that said metal component is silver and comprises about 0.1 weight percent to about 5 weight percent of said catalyst.
Claim 7
Dependent Claim
28 words
The process of claim 1 further characterized in that said metal component is zirconium and comprises about 0.1 weight percent to about 5 weight percent of said catalyst.
Claim 8
Dependent Claim
24 words
The process of claim 1 further characterized in that said isomerizable alkylaromatic hydrocarbon is a monocyclic aromatic hydrocarbon having two lower alkyl group substituents.
Claim 9
Dependent Claim
19 words
The process of claim 7 further characterized in that said isomerizable hydrocarbon is selected from ortho-diethylbenzene, meta-diethylbenzene and para-diethylbenzene.
Claim 10
Dependent Claim
19 words
The process of claim 7 further characterized in that said isomerizable hydrocarbon is selected from orthoxylene, meta-xylene and para-xylene.
References Cited (Backward Citations)
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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) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |