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US5068473A
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Hydrogenolysis/dehydrohalogenation process
Assignee: EIDP Inc
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Filing: 1990-10-17
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Granted: 1991-11-26
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Expires: 2010-10-17
Abstract
Abstract A process for the hydrogenolysis and/or dehydrohalogenation of fluorohalocarbons and/or fluorohalohydrocarbons by reacting the fluorohalocarbons and/or fluorohalohydrocarbons with a source of hydrogen in the presence of a catalyst, the improvement comprising utilizing a rhenium-containing catalyst, which may, optionally, contain at least one Group VIII metal and may, optionally, be supported.
Inventors
- 👤 Carl S. Kellner
- 👤 V. N. Mallikarjuna Rao
- 👤 Frank J. Weigert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:27
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/61; C07C; C07C17/00; C07C17/23
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
155 words
In a process for the hydrogenolysis of fluorohalocarbons and/or fluorohalohydrocarbons which contain at least one halo group selected from chloro and bromo by reacting the fluoro-halocarbons and/or fluorohalohydrocarbons with a source of hydrogen in the presence of a catalyst, the improvement comprising utilizing a rhenium-containing catalyst selected from the group consisting of (i) catalysts consisting essentially of rhenium, (ii) unsupported catalysts containing at least about 50 percent by weight rhenium with the balance being one or more Group VIII metals, (iii) catalysts consisting essentially of rhenium supported on carbon, alumina, fluorided alumina, aluminum fluoride, or calcium fluoride, and (iv) supported catalysts consisting essentially of one or more Group VIII metals and from 0.1 to 20 percent by weight of rhenium supported on carbon, alumina, fluorided alumina, aluminum fluoride or calcium fluoride, wherein said one or more Group VIII metals total up to 10 percent by weight and rhenium is the major component on said support.
Claim 2
Dependent Claim
155 words
In a process for the hydrogenolysis of fluorohalocarbons and/or fluorohalohydrocarbons which contain at least one halo group selected from chloro and bromo by reacting the fluoro-halocarbons and/or fluorohalohydrocarbons with a source of hydrogen in the presence of a catalyst, the improvement comprising utilizing a rhenium-containing catalyst selected from the group consisting of (i) catalysts consisting essentially of rhenium, (ii) unsupported catalysts containing at least about 50 percent by weight rhenium with the balance being one or more Group VIII metals, (iii) catalysts consisting essentially of rhenium supported on carbon, alumina, fluorided alumina, aluminum fluoride, or calcium fluoride, and (iv) supported catalysts consisting essentially of one or more Group VIII metals and from 0.1 to 20 percent by weight of rhenium supported on carbon, alumina, fluorided alumina, aluminum fluoride or calcium fluoride, wherein said one or more Group VIII metals total up to 10 percent by weight and rhenium is the major component on said support.
Claim 3
Dependent Claim
13 words
The process of claim 1 wherein the rhenium-containing catalyst consists essentially of rhenium.
Claim 4
Dependent Claim
30 words
The process of claim 1 wherein the rhenium-containing catalyst consists essentially of at least 50% by weight of rhenium, the balance being selected from at least one Group VIII metal.
Claim 5
Dependent Claim
16 words
The process of claim 1 wherein the rhenium-containing catalyst consists essentially of rhenium supported on carbon.
Claim 6
Dependent Claim
21 words
The process of claim 1 wherein the hydrogenolysis is conducted at a temperature from about 100° C. to about 400° C.
Claim 7
Dependent Claim
26 words
The process of claim 1 wherein the source of hydrogen is present in an amount of at least 0.2 moles per mole of fluorohalocarbons and/or fluorohalohydrocarbons.
Claim 8
Dependent Claim
90 words
The process of claim 1 wherein the fluorohalocarbons and/or fluorohalohydrocarbons are selected from at least one of cyclic and acyclic compounds represented by the empirical formula C n H m F p X q , where X is Cl and/or Br; n is an integer from 1 to 10; m is an integer from 0 to 20; p is an integer from 1 to 21; and q is an integer from 1 to 21, provided that m+p+q=2n+2 when the compound is acyclic and equals 2n when the compound is cyclic.
Claim 9
Dependent Claim
20 words
The process of claim 1 wherein the fluorohalocarbons and/or fluorohalohydrocarbons are at least one selected from 1,1,1-trichloro-2,2,2-trifluoroethane, 1,1,2-trichloro-1,2,2-trifluoroethane, and 1,2-dichloro-2,2-difluoroethane.
Claim 10
Dependent Claim
13 words
The process of claim 5 wherein the rhenium-containing catalyst consists essentially of rhenium.
Claim 11
Dependent Claim
30 words
The process of claim 5 wherein the rhenium-containing catalyst consists essentially of at least 50% by weight of rhenium, the balance being selected from at least one Group VIII metal.
Claim 12
Dependent Claim
24 words
The process of claim 5 wherein the rhenium-containing catalyst consists essentially of rhenium supported on carbon, alumina, fluorided alumina, aluminum fluoride and/or calcium fluoride.
Claim 13
Dependent Claim
28 words
The process of claim 5 wherein the the rhenium-containing catalysts is a supported catalyst consisting essentially of one or more Group VIII metals and rhenium supported on carbon.
Claim 14
Dependent Claim
26 words
The process of claim 5 wherein the source of hydrogen is present in an amount of at least 0.2 moles per mole of fluorohalocarbons and/or fluorohalohydrocarbons.
Claim 15
Dependent Claim
90 words
The process of claim 5 wherein the fluorohalocarbons and/or fluorohalohydrocarbons are selected from at least one of cyclic and acyclic compounds represented by the empirical formula C n H m F p X q , where X is Cl and/or Br; n is an integer from 1 to 10; m is an integer from 0 to 20; p is an integer from 1 to 21; and q is an integer from 1 to 21, provided that m+p+q=2n+2 when the compound is acyclic and equals 2n when the compound is cyclic.
Claim 16
Dependent Claim
19 words
The process of claim 5 wherein the fluorohalocarbons and/or fluorohalohydrocarbons are at least one of 1,1,1-trichloro-2,2,2-trifluoroethane, 1,1,2-trichloro-1,2,2-trifluoroethane and 1,2-dichloro-2,2-difluoroethane.
Claim 17
Dependent Claim
44 words
The process of claim 1 wherein at least one of the fluorohalocarbons and/or fluorohalohydrocarbons contains chlorine and wherein the product of the reaction comprises at least one fluorohalocarbon and/or fluorohalohydrocarbon containing one less chlorine than the fluorohalohydrocarbon or fluorohalocarbon from which it was formed.
Claim 18
Dependent Claim
12 words
The process of claim 1 wherein said fluorohalocarbons and/or fluorohalohydrocarbons are fluorohalohydrocarbons.
Claim 19
Dependent Claim
13 words
The process of claim 17 wherein the rhenium-containing catalyst consists essentially of rhenium.
Claim 20
Dependent Claim
30 words
The process of claim 17 wherein the rhenium-containing catalyst consists essentially of at least 50% by weight of rhenium, the balance being selected from at least one Group VIII metal.
Claim 21
Dependent Claim
24 words
The process of claim 17 wherein the rhenium-containing catalyst consists essentially of rhenium supported on carbon, alumina, fluorided alumina, aluminum fluoride and/or calcium fluoride.
Claim 22
Dependent Claim
21 words
The process of claim 17 wherein the hydrogenolysis is conducted at a temperature from about 200° C. to about 400° C.
Claim 23
Dependent Claim
26 words
The process of claim 17 wherein the source of hydrogen is present in an amount of at least 0.2 moles per mole of fluorohalocarbons and/or fluorohalohydrocarbons.
Claim 24
Dependent Claim
88 words
The process of claim 17 wherein the fluorohalohydrocarbons are selected from at least one of cyclic and acyclic compounds represented by the empirical formula C n H m F p X q , where X is Cl and/or Br; n is an integer from 1 to 10; m is an integer from 1 to 20; p is an integer from 1 to 21; and q is an integer from 1 to 21, provided that m+p+q=2n+2 when the compound is acyclic and equals 2n when the compound is cyclic.
Claim 25
Dependent Claim
119 words
In a process for the hydrogenolysis of fluorohalocarbons and/or fluorohalohydrocarbons which contain at least one halo group selected from chloro and bromo by reacting the fluorohalocarbons and/or fluorohalohydrocarbons with a source of hydrogen in the presence of a catalyst, the improvement comprising utilizing a rhenium-containing catalyst selected from the group consisting of (i) catalysts consisting essentially of rhenium supported on fluorided alumina and/or aluminum fluoride, and (ii) supported catalysts consisting essentially of one or more Group VIII metals and from 0.1 to 20 percent by weight of rhenium supported on fluorinated alumina and/or aluminum fluoride, wherein said one or more Group VIII metals total up to 10 percent by weight and rhenium is the major component on said support.
Claim 26
Dependent Claim
119 words
In a process for the hydrogenolysis of fluorohalocarbons and/or fluorohalohydrocarbons which contain at least one halo group selected from chloro and bromo by reacting the fluorohalocarbons and/or fluorohalohydrocarbons with a source of hydrogen in the presence of a catalyst, the improvement comprising utilizing a rhenium-containing catalyst selected from the group consisting of (i) catalysts consisting essentially of rhenium supported on fluorided alumina and/or aluminum fluoride, and (ii) supported catalysts consisting essentially of one or more Group VIII metals and from 0.1 to 20 percent by weight of rhenium supported on fluorinated alumina and/or aluminum fluoride, wherein said one or more Group VIII metals total up to 10 percent by weight and rhenium is the major component on said support.
Claim 27
Dependent Claim
19 words
The process of claim 24 wherein the catalyst consists essentially of rhenium supported on fluorinated alumina and/or aluminum fluoride.
Claim 28
Dependent Claim
36 words
The process of claim 1 wherein the fluorohalocarbons and/or fluorohalohydrocarbons are selected from the group of fluorohalocarbons consisting of CCl 2 FCClF 2 , CCl 2 FCF 3 and CF 3 CCl 2 CF 3 .
Claim 29
Dependent Claim
14 words
The process of claim 26 wherein the fluorohalocarbon is CCl 2 FCF 3 .
Claim 30
Dependent Claim
16 words
The process of claim 26 wherein the fluorohalocarbon is CF 3 CCl 2 CF 3 .
Claim 31
Dependent Claim
14 words
The process of claim 26 wherein the fluorohalocarbon is CCl 2 FCClF 2 .
Claim 32
Dependent Claim
24 words
The process of claim 1 wherein the rhenium-containing catalyst consists essentially of rhenium supported on carbon, alumina, fluorided alumina, aluminum fluoride and/or calcium fluoride.
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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) | 1994-11-25 | 1995-05-27 | 1995-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-25 | 1999-05-27 | 1999-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-25 | 2003-05-27 | 2003-11-26 | $7700.00 | Window Closed / Lapsed |