US4783541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for isomerizing alkylthiophenes
Assignee: Hoechst AG
•
Filing: 1987-12-18
•
Granted: 1988-11-08
•
Expires: 2007-12-18
Abstract
Abstract The invention relates to a process for isomerizing alkylthiophenes on zeolite catalysts. In particular, methylthiophene and ethylthiophene can be isomerized by this process. Suitable zeolites are in particular synthetic zeolites of the pentasil, mordenite of faujasite type in their acid form.
Inventors
- 👤 Klaus Eichler
- 👤 Ernst I. Leupold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:18
CPC Classifications
C; C07; C07D; C07D333/00; C07D333/02; C07D333/04; C07D333/06; C07D333/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
39 words
A process for isomerizing alkylthiophenes, which process is carried out in the gaseous phase at temperatures from about 300°-450° C., which comprises contacting an alkylthiophene or a mixture of alkylthiophenes with an acid zeolyte catalyst of the pentasil type.
Claim 2
Dependent Claim
39 words
A process for isomerizing alkylthiophenes, which process is carried out in the gaseous phase at temperatures from about 300°-450° C., which comprises contacting an alkylthiophene or a mixture of alkylthiophenes with an acid zeolyte catalyst of the pentasil type.
Claim 3
Dependent Claim
13 words
The process as claimed in claim 1, wherein the alkylthiophene is a methylthiophene.
Claim 4
Dependent Claim
14 words
The process as claimed in claim 1, wherein the alkylthiophene is an ethyl thiophene.
Claim 5
Dependent Claim
12 words
The process as claimed in claim 1, wherein the catalyst is H-ZSM-5.
Claim 6
Dependent Claim
12 words
The process as claimed in claim 1, wherein the alkylthiophene is 2-methylthiophene.
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) | 1991-11-08 | 1992-05-09 | 1992-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-08 | 1996-05-09 | 1996-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-08 | 2000-05-09 | 2000-11-08 | $7700.00 | Window Closed / Lapsed |