US4638105A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acid-catalyzed xylene isomerization
Assignee: Mobil Oil AS
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Filing: 1985-10-15
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Granted: 1987-01-20
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Expires: 2005-10-15
Abstract
Abstract Feedstock comprising xylene isomers is converted to isomerization product by the present process over catalyst prepared by a method for substituting aluminum or gallium for boron or iron contained in the framework of a high silica content zeolite.
Inventors
- 👤 Clarence D. Chang
- 👤 Joseph N. Miale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:55
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/70; B01J29/7007; B01J29/40; B01J2229/00; B01J2229/10; B01J2229/26; B01J2229/30; B01J2229/36; B01J2229/42
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
89 words
A process for converting feedstock comprising xylene isomers to isomerization conversion product comprising xylene isomers which comprises contacting said feedstock at conversion conditions sufficient to convert said feedstock to said product with a catalyst composition prepared by a method for substituting aluminum or gallium for boron or iron contained in the robust framework of a high silica content crystalline zeolite, which method comprises hydrothermally treating said zeolite in the presence of a compound of said aluminum or gallium, said hydrothermal treatment being under conditions effective to induce said substitution.
Claim 2
Dependent Claim
89 words
A process for converting feedstock comprising xylene isomers to isomerization conversion product comprising xylene isomers which comprises contacting said feedstock at conversion conditions sufficient to convert said feedstock to said product with a catalyst composition prepared by a method for substituting aluminum or gallium for boron or iron contained in the robust framework of a high silica content crystalline zeolite, which method comprises hydrothermally treating said zeolite in the presence of a compound of said aluminum or gallium, said hydrothermal treatment being under conditions effective to induce said substitution.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein said aluminum or gallium compound is water soluble.
Claim 4
Dependent Claim
14 words
The process of claim 1 wherein said aluminum or gallium compound is an oxide.
Claim 5
Dependent Claim
17 words
The process of claim 3 wherein said aluminum compound is an oxide binder composited with said zeolite.
Claim 6
Dependent Claim
24 words
The process of claim 1 wherein said high silica content crystalline zeolite has the structure of ZSM-5, ZSM-11, ZSM-12, ZSM-23, ZSM-35, ZSM-38 or ZSM-48.
Claim 7
Dependent Claim
11 words
The process of claim 4 wherein said oxide binder is alumina.
Claim 8
Dependent Claim
13 words
The process of claim 5 wherein said zeolite has the structure of ZSM-5.
Claim 9
Dependent Claim
13 words
The process of claim 6 wherein said zeolite has the structure of ZSM-5.
Claim 10
Dependent Claim
22 words
The process of claim 1 wherein said hydrothermal treatment conditions include a temperature of from about 50° C. to about 375° C.
Claim 11
Dependent Claim
60 words
The process of claim 1 wherein said conversion conditions include a temperature of from about 200° C. to about 760° C., a pressure of from about atmospheric to about 200 atmospheres, a weight hourly space velocity of from about 0.08 hr -1 to about 2000 hr -1 and a hydrogen/feedstock hydrocarbon compound mole ratio of from 0 to about 100.
Claim 12
Dependent Claim
123 words
A process for conducting acid-catalyzed conversion of feedstock comprising xylene isomers to isomerization product comprising xylene isomers which comprises contacting said feedstock at conversion conditions, including a temperature of from about 230° C. to about 510° C., a pressure of from about 3 atmospheres to about 35 atmospheres and a hydrogen/feedstock hydrocarbon mole ratio of from 0 to about 100, with a catalyst composition prepared by a method for substituting aluminum or gallium for boron or iron contained in the robust framework of a high silica content crystalline zeolite having the structure of ZSM-5, which method comprises hydrothermally treating said zeolite in the presence of a compound of said aluminum or gallium, said hydrothermal treatment being under conditions effective to induce said substitution.
Claim 13
Dependent Claim
123 words
A process for conducting acid-catalyzed conversion of feedstock comprising xylene isomers to isomerization product comprising xylene isomers which comprises contacting said feedstock at conversion conditions, including a temperature of from about 230° C. to about 510° C., a pressure of from about 3 atmospheres to about 35 atmospheres and a hydrogen/feedstock hydrocarbon mole ratio of from 0 to about 100, with a catalyst composition prepared by a method for substituting aluminum or gallium for boron or iron contained in the robust framework of a high silica content crystalline zeolite having the structure of ZSM-5, which method comprises hydrothermally treating said zeolite in the presence of a compound of said aluminum or gallium, said hydrothermal treatment being under conditions effective to induce said substitution.
Claim 14
Dependent Claim
14 words
The process of claim 11 wherein said aluminum or gallium compound is water soluble.
Claim 15
Dependent Claim
14 words
The process of claim 11 wherein said aluminum or gallium compound is an oxide.
Claim 16
Dependent Claim
17 words
The process of claim 13 wherein said aluminum compound is an oxide binder composited with said zeolite.
Claim 17
Dependent Claim
11 words
The process of claim 14 wherein said oxide binder is alumina.
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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) | 1990-01-19 | 1990-07-21 | 1991-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-19 | 1994-07-21 | 1995-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-19 | 1998-07-21 | 1999-01-20 | $7700.00 | Window Closed / Lapsed |