US3907914A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Isomerization of aromatic hydrocarbons
Assignee: Mobil Oil AS
•
Filing: 1973-07-17
•
Granted: 1975-09-23
•
Expires: 1993-07-17
Abstract
Abstract Alkyl aromatic hydrocarbons are isomerized in the presence of an aromatic diluent and a crystalline aluminosilicate catalyst.
Inventors
- 👤 Jr James L Willis
- 👤 Jr Philip Grandio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:50
CPC Classifications
C; C07; C07C; C07C5/00; C07C5/22; C07C5/27; C07C5/2729; C07C5/2732; C07C5/2737
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
125 words
A PROCESS FOR EFFECTING CATALYTIC ISOMERIZATION OF A XYLENE MIXTURE WHICH COMPRISES CONTACTING SAID MIXTURE IN THE LIQUID PHASE IN THE ABSENCE OF ADDED HYDROGEN AT A TEMPERATURE WITHIN THE RANGE OF 350*F TO 650*F. AT A PRESSURE OF UP TO ABOUT 2000 PSIG. AT A LIQUID HOURLY SPACE VELOCITY WITHIN THE RANGE OF 0.05 TO 40 IN THE PRESENCE OF 5 TO 30 WEIGHT PERCENT BASED ON THE XYLENE FEED MIXTURE OF ETHYLBENZENE AND A CRYTALLINE ZEOTLITE COMPOSITION HAVING A COMPOSITION, IN TERMS OF MOLE RATIOS OF OXIDES, ASFOLLOWS: OF 9$0.2 M2O/N: W2O3 : 3-20 YO2 : ZH2O WHEREIN M IS A CATION, N IS THE VALENCE OF SAID CATION, W IS ALIMINUM AND Y IS SILICON, AND Z IS BETWEEN 0 AND 20.
Claim 2
Dependent Claim
125 words
A PROCESS FOR EFFECTING CATALYTIC ISOMERIZATION OF A XYLENE MIXTURE WHICH COMPRISES CONTACTING SAID MIXTURE IN THE LIQUID PHASE IN THE ABSENCE OF ADDED HYDROGEN AT A TEMPERATURE WITHIN THE RANGE OF 350*F TO 650*F. AT A PRESSURE OF UP TO ABOUT 2000 PSIG. AT A LIQUID HOURLY SPACE VELOCITY WITHIN THE RANGE OF 0.05 TO 40 IN THE PRESENCE OF 5 TO 30 WEIGHT PERCENT BASED ON THE XYLENE FEED MIXTURE OF ETHYLBENZENE AND A CRYTALLINE ZEOTLITE COMPOSITION HAVING A COMPOSITION, IN TERMS OF MOLE RATIOS OF OXIDES, ASFOLLOWS: OF 9$0.2 M2O/N: W2O3 : 3-20 YO2 : ZH2O WHEREIN M IS A CATION, N IS THE VALENCE OF SAID CATION, W IS ALIMINUM AND Y IS SILICON, AND Z IS BETWEEN 0 AND 20.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein M is selected from the group consisting of alkylammonium and arylammonium, metals, ammonium and hydrogen.
Claim 4
Dependent Claim
14 words
The process of claim 1 wherein the zeolite has been subjected to thermal treatment.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |