US5268343A
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Process for the reactivation of an activated charcoal catalyst employed in the preparation of 1,1,1,2,3,3,3-heptafluoropropane (R 227)
Assignee: Solvay SA
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Filing: 1993-03-25
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Granted: 1993-12-07
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Expires: 2013-03-25
Abstract
Abstract The invention relates to a process for the reactivation of an activated charcoal catalyst employed in the preparation of 1,1,1,2,3,3,3-heptafluoropropane (R 227) in which the catalyst is heated to from 450° to 900° C. in a stream of inert gas or under reduced pressure.
Inventors
- 👤 Peter Hopp
- 👤 Uwe Wirth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:37
CPC Classifications
B; B01; B01J; B01J38/00; B01J38/02; B01J21/00; B01J21/20; C; C07; C07C; C07C17/00; C07C17/07; C07C17/087; Y; Y02; Y02P; Y02P20/00; Y02P20/10; Y02P20/50; Y02P20/584
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
39 words
A process for the reactivation of an activated charcoal catalyst employed in the preparation of 1,1,1,2,3,3,3-heptafluoropropane (R 227), which comprises heating the catalyst to from 450° to 900° C. in a stream of inert gas or under reduced pressure.
Claim 2
Dependent Claim
39 words
A process for the reactivation of an activated charcoal catalyst employed in the preparation of 1,1,1,2,3,3,3-heptafluoropropane (R 227), which comprises heating the catalyst to from 450° to 900° C. in a stream of inert gas or under reduced pressure.
Claim 3
Dependent Claim
18 words
The process as claimed in claim 1, wherein the catalyst is heated to from 550° to 800° C.
Claim 4
Dependent Claim
18 words
The process as claimed in claim 1, wherein the catalyst is heated to from 600° to 800° C.
Claim 5
Dependent Claim
15 words
The process as claimed in claim 1, wherein the catalyst is heated by microwave irradiation.
Claim 6
Dependent Claim
18 words
The process as claimed in claim 1, wherein the catalyst is heated in a stream of inert gas.
Claim 7
Dependent Claim
14 words
The process as claimed in claim 5, wherein the inert gas employed is nitrogen.
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) | 1996-12-06 | 1997-06-07 | 1997-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-12-06 | 2001-06-07 | 2001-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-12-06 | 2005-06-07 | 2005-12-07 | $7700.00 | Window Closed / Lapsed |