US5036036A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chromium oxide catalyst composition
Assignee: EIDP Inc
•
Filing: 1989-06-13
•
Granted: 1991-07-30
•
Expires: 2009-06-13
Abstract
Abstract An improved Cr 2 O 3 catalyst composition, prepared by pyrolysis of ammonium dichromate, which contains less than 100 ppm of alkali metal and is useful in HF hydrofluorination reactions.
Inventors
- 👤 Jan J. Lerou
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:42
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/093; C07C17/20; C07C17/202; C07C17/206; B; B01; B01J; B01J23/00; B01J23/16; B01J23/24; B01J23/26; C07C17/21
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
31 words
A catalyst composition comprising Cr 2 O 3 prepared by pyrolysis of (NH 4 ) 2 Cr 2 O 7 and containing an alkali metal content of 100 ppm or less.
Claim 2
Dependent Claim
31 words
A catalyst composition comprising Cr 2 O 3 prepared by pyrolysis of (NH 4 ) 2 Cr 2 O 7 and containing an alkali metal content of 100 ppm or less.
Claim 3
Dependent Claim
39 words
The catalyst composition of claim 1 wherein the alkali metal content is obtained by treating Cr 2 O 3 containing more than 100 ppm of alkali metal content to reduce the alkali metal content to 100 ppm or less.
Claim 4
Dependent Claim
57 words
The catalyst composition of claim 1 wherein the catalyst composition is obtained by first treating (NH 4 ) 2 Cr 2 O 7 containing 60-2000 ppm alkali metal to reduce its alkali metal content to less than 60 ppm and thereby results in the Cr 2 O 3 containing 100 ppm or less of alkali metal content.
Claim 5
Dependent Claim
14 words
The catalyst composition of claim 1 where the alkali metal is potassium and sodium.
Claim 6
Dependent Claim
12 words
The catalyst composition of claim 2 wherein the treating step is water-washing.
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) | 1994-07-29 | 1995-01-28 | 1995-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-29 | 1999-01-28 | 1999-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-29 | 2003-01-28 | 2003-07-30 | $7700.00 | Window Closed / Lapsed |