US5364992A
Expired / Lapsed
US
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Halocarbon hydrogenolysis
Assignee: EIDP Inc
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Filing: 1993-09-16
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Granted: 1994-11-15
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Expires: 2013-09-16
Abstract
Abstract Halocarbons such as CCl 2 F, CF 3 CFHCl 2 or CF 3 CFCl 2 which contain chlorine and/or bromine are contacted with hydrogen in the presence of silicon carbide and/or a metal selected from aluminum, molybdenum, titanium, nickel, iron or cobalt (or their alloys) at temperatures of 350° to 700° C. and pressures of 0 to 1000 psig to obtain a product wherein at least one chlorine or bromine in the starting material has been replaced by hydrogen.
Inventors
- 👤 William H. Manogue
- 👤 Velliyur N. M. Rao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:15
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/23
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
140 words
A process for the hydrogenolysis of a halocarbon starting compound selected from the group consisting of CF 3 CC1 2 F, CF 3 CHC1F, CF 3 CC1FCF 3 , CC1F 2 CC1F 2 , CF 3 CC1 3 and CF 3 CC1F 2 comprising contracting said halocarbon starting compound with at least 0.1 mole of hydrogen per mole of said halocarbon starting compound in an empty reaction vessel of nickel, iron or their alloys at a pressure within the range of from 0 psig to 1000 psig, at a temperature within the range of from 350° C. to 700° C. and for a time sufficient to produce a hydrogenolysis product wherein at least one chlorine has been replaced by hydrogen, at least 90% of the product of said hydrogenolysis containing the same number of fluorines as said halocarbon starting compound.
Claim 2
Dependent Claim
140 words
A process for the hydrogenolysis of a halocarbon starting compound selected from the group consisting of CF 3 CC1 2 F, CF 3 CHC1F, CF 3 CC1FCF 3 , CC1F 2 CC1F 2 , CF 3 CC1 3 and CF 3 CC1F 2 comprising contracting said halocarbon starting compound with at least 0.1 mole of hydrogen per mole of said halocarbon starting compound in an empty reaction vessel of nickel, iron or their alloys at a pressure within the range of from 0 psig to 1000 psig, at a temperature within the range of from 350° C. to 700° C. and for a time sufficient to produce a hydrogenolysis product wherein at least one chlorine has been replaced by hydrogen, at least 90% of the product of said hydrogenolysis containing the same number of fluorines as said halocarbon starting compound.
Claim 3
Dependent Claim
27 words
The process of claim 1 wherein the halocarbon starting compound is selected from CF 3 CC1 2 F, CF 3 CHC1F and CC1F 2 CC1F 2 .
Claim 4
Dependent Claim
15 words
The process of claim 1 wherein the reaction vessel is nickel or a nickel alloy.
Claim 5
Dependent Claim
15 words
The process of claim 1 wherein the temperature ranges from 400° C. to 700° C.
Claim 6
Dependent Claim
13 words
The process of claim 4 wherein the pressure is 0 to 500 psig.
Claim 7
Dependent Claim
35 words
The process of claim 5 wherein the halocarbon starting compound is CC1F 2 CC1F 2 , the reaction vessel is nickel or a nickel alloy, and the reaction time is between 0.2 to 8 minutes.
Claim 8
Dependent Claim
35 words
The process of claim 5 wherein the halocarbon starting compound is CF 3 CC1 2 F, the reaction vessel is nickel or a nickel alloy, and the reaction time is between 0.2 and 8 minutes.
Claim 9
Dependent Claim
33 words
The process of claim 5 wherein the halocarbon starting compound is CF 3 CHC1F, the reaction vessel is nickel or a nickel alloy, and the reaction time is between 0.2 and 8 minutes.
Claim 10
Dependent Claim
35 words
The process of claim 5 wherein the halocarbon starting compound is CF 3 CC1F 2 , the reaction vessel is nickel or a nickel alloy, and the reaction time is between 0.2 and 8 minutes.
Claim 11
Dependent Claim
35 words
The process of claim 5 wherein the halocarbon starting compound is CF 3 CC1 3 , the reaction vessel is nickel or a nickel alloy, and the reaction time is between 0.2 and 8 minutes.
Claim 12
Dependent Claim
35 words
The process of claim 5 wherein the halocarbon starting compound is CF 3 CC1FCF 3 , the reaction vessel is nickel or a nickel alloy, and the reaction time is between 0.2 and 8 minutes.
Claim 13
Dependent Claim
48 words
The process of claim 1 wherein the reaction vessel is either an alloy containing about 76 percent nickel, about 15.5 percent chromium and about 8 percent iron or an alloy containing about 59 percent nickel, about 15.5 percent chromium, about 16 percent molybdenum and about 3.75 percent tungsten.
Claim 14
Dependent Claim
57 words
The process of claim 1 wherein a halocarbon starting compound selected from CF 3 CC1 2 F, CF 3 CHC1F, CC1F 2 CC1F 2 , CF 3 CC1 3 and CF 3 CC1F 2 , is contacted with at least about 2 moles of hydrogen per mole of said starting compound in a nickel alloy reaction vessel.
Claim 15
Dependent Claim
70 words
The process of claim 1 wherein the halocarbon starting compound is selected from CF 3 CC1 2 F, CC1F 2 CC1F 2 and CF 3 CC1 3 and wherein the hydrogenolysis is conducted at a temperature within the range of from 350° C. to 700° C. for a time sufficient to produce as the major product of the hydrogenolysis, hydrogenolysis product wherein just one chlorine has been replaced by hydrogen.
Claim 16
Dependent Claim
135 words
A process for the hydrogenolysis of a halocarbon starting compound selected from the group consisting of CF 3 CC1 2 F, CF 3 CHC1F, CF 3 CC1FCF 3 , CC1F 2 CC1F 2 , CF 3 CC1 3 and CF 3 CC1F 2 comprising contacting said starting compound with at least 0.1 mole of hydrogen per mole of said halocarbon starting compound in an empty chrome plated reaction vessel at a pressure within the range of from 0 psig to 1000 psig, at a temperature within the range of from 350° C. to 700° C. and for a time sufficient to produce a hydrogenolysis product wherein at least one chlorine has been replaced by hydrogen, at least 90% of the product of said hydrogenolysis containing the same number of fluorines as said halocarbon starting compound.
Claim 17
Dependent Claim
135 words
A process for the hydrogenolysis of a halocarbon starting compound selected from the group consisting of CF 3 CC1 2 F, CF 3 CHC1F, CF 3 CC1FCF 3 , CC1F 2 CC1F 2 , CF 3 CC1 3 and CF 3 CC1F 2 comprising contacting said starting compound with at least 0.1 mole of hydrogen per mole of said halocarbon starting compound in an empty chrome plated reaction vessel at a pressure within the range of from 0 psig to 1000 psig, at a temperature within the range of from 350° C. to 700° C. and for a time sufficient to produce a hydrogenolysis product wherein at least one chlorine has been replaced by hydrogen, at least 90% of the product of said hydrogenolysis containing the same number of fluorines as said halocarbon starting compound.
Claim 18
Dependent Claim
15 words
The process of claim 15 wherein the temperature ranges from 400° C. to 700° C.
Claim 19
Dependent Claim
13 words
The process of claim 16 wherein the pressure is 0 to 500 psig.
Claim 20
Dependent Claim
113 words
A process for the hydrogenolysis of CC1F 2 CC1F 2 , comprising contacting said CC1F 2 CC1F 2 with at least 0.1 mole of hydrogen per mole of said CC1F 2 CC1F 2 in an empty chrome-plated reaction vessel at a pressure within the range of from 0 psig to 1000 psig, at a temperature within the range of from 400° C. to 700° C. and for a reaction time between 0.2 to 8 minutes sufficient to produce a hydrogenolysis product wherein at least one chlorine has been replaced by hydrogen at least 90% of the product of said hydrogenolysis containing the same number of fluorines as said CC1F 2 CC1F 2 .
Claim 21
Dependent Claim
113 words
A process for the hydrogenolysis of CC1F 2 CC1F 2 , comprising contacting said CC1F 2 CC1F 2 with at least 0.1 mole of hydrogen per mole of said CC1F 2 CC1F 2 in an empty chrome-plated reaction vessel at a pressure within the range of from 0 psig to 1000 psig, at a temperature within the range of from 400° C. to 700° C. and for a reaction time between 0.2 to 8 minutes sufficient to produce a hydrogenolysis product wherein at least one chlorine has been replaced by hydrogen at least 90% of the product of said hydrogenolysis containing the same number of fluorines as said CC1F 2 CC1F 2 .
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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) | 1997-11-14 | 1998-05-16 | 1998-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-11-14 | 2002-05-16 | 2002-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-11-14 | 2006-05-16 | 2006-11-15 | $7700.00 | Window Closed / Lapsed |