US5136113A
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US
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Catalytic hydrogenolysis
Assignee: EIDP Inc
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Filing: 1991-07-23
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Granted: 1992-08-04
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Expires: 2011-07-23
Abstract
Abstract Catalytic hydrogenolysis of fluorohalocarbons (e.g., CFCs) and fluorohalohydrocarbons (e.g., HCFCs), using catalysts of Re, Co, Ni, Ru, Rh, Pd, Os, Ir, and/or Pt on a carbon having low ash content. Preferred catalysts use carbon which is acid-washed, first with an acid other than hydrofluoric acid and then with hydrofluoric acid; and also have a low content of phosphorus, sulfur, potassium, sodium and iron.
Inventors
- 👤 V. N. M. Rao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:02
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/23
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
148 words
A process for the catalytic hydrogenolysis of a cyclic or acyclic compound having the formula C n H m F p X q wherein n is an integer from 1 to 6, m is an integer from 0 to 12, p is an integer from 1 to 13, q is an integer from 1 to 13 and each X is independently selected from Cl and Br, provided that m+p+q equals 2n+2 when the compound is saturated and acyclic, equals 2n when the compound is saturated and cyclic or is olefinic and acyclic, and equals 2n-2 when the compound is olefinic and cyclic, using a catalyst of at least one metal selected from the group consisting of rhenium, cobalt, nickel, ruthenium, rhodium, palladium, osmium, iridium and platinum supported on carbon which is characterized by the carbon support having an ash content of less than about 0.1 percent by weight.
Claim 2
Dependent Claim
148 words
A process for the catalytic hydrogenolysis of a cyclic or acyclic compound having the formula C n H m F p X q wherein n is an integer from 1 to 6, m is an integer from 0 to 12, p is an integer from 1 to 13, q is an integer from 1 to 13 and each X is independently selected from Cl and Br, provided that m+p+q equals 2n+2 when the compound is saturated and acyclic, equals 2n when the compound is saturated and cyclic or is olefinic and acyclic, and equals 2n-2 when the compound is olefinic and cyclic, using a catalyst of at least one metal selected from the group consisting of rhenium, cobalt, nickel, ruthenium, rhodium, palladium, osmium, iridium and platinum supported on carbon which is characterized by the carbon support having an ash content of less than about 0.1 percent by weight.
Claim 3
Dependent Claim
24 words
The process of claim 1 wherein the carbon support is first treated with acid other than hydrofluoric acid and then treated with hydrofluoric acid.
Claim 4
Dependent Claim
17 words
The process of claim 2 wherein the first acid treatment uses acid containing neither phosphorus nor sulfur.
Claim 5
Dependent Claim
16 words
The process of claim 2 wherein the first acid treatment uses HCl or HNO 3 .
Claim 6
Dependent Claim
10 words
The process of claim 1 wherein each X is Cl.
Claim 7
Dependent Claim
14 words
The process of claim 5 wherein the catalyst contains less than 200 ppm phosphorus.
Claim 8
Dependent Claim
14 words
The process of claim 5 wherein the catalyst contains less than 200 ppm sulfur.
Claim 9
Dependent Claim
14 words
The process of claim 5 wherein the catalyst contains less than 100 ppm potassium.
Claim 10
Dependent Claim
14 words
The process of claim 8 wherein the catalyst contains less than 100 ppm sodium.
Claim 11
Dependent Claim
14 words
The process of claim 9 wherein the catalyst contains less than 100 ppm iron.
Claim 12
Dependent Claim
27 words
The process of claim 1 wherein n is 1 to 3, m is 0 to 6, p is 1 to 7 and q is 1 to 7.
Claim 13
Dependent Claim
23 words
The process of claim 1 wherein said at least one metal constitutes between about 0.1 and 10 percent by weight of the catalyst.
Claim 14
Dependent Claim
21 words
The process of claim 1 wherein hydrogenolysis is carried out at a temperature between about 125° C. and about 350° C.
Claim 15
Dependent Claim
13 words
The process of claim 1 wherein 2,2-dichloro-1,1,1,2-tetrafluoroethane is converted to 2-chloro-1,1,1,2-tetrafluoroethane and 1,1,1,2-tetrafluoroethane.
Claim 16
Dependent Claim
11 words
The process of claim 1 wherein 2-chloro-1,1,1,2-tetrafluoroethane is converted to 1,1,1,2-tetrafluoroethane.
Claim 17
Dependent Claim
14 words
The process of claim 1 wherein the catalyst contains less than 100 ppm potassium.
Claim 18
Dependent Claim
14 words
The process of claim 1 wherein the catalyst contains less than 100 ppm sodium.
Claim 19
Dependent Claim
14 words
The process of claim 1 wherein the catalyst contains less than 100 ppm iron.
Claim 20
Dependent Claim
14 words
The process of claim 1 wherein the catalyst contains less than 200 ppm phosphorus.
Claim 21
Dependent Claim
14 words
The process of claim 1 wherein the catalyst contains less than 200 ppm sulfur.
References Cited (Backward Citations)
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Cited
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Cited
JPH01128942A
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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) | 1995-08-04 | 1996-02-03 | 1996-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-04 | 2000-02-03 | 2000-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-04 | 2004-02-03 | 2004-08-04 | $7700.00 | Window Closed / Lapsed |