US5057634A
Expired / Lapsed
US
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Multistep synthesis of hexafluoropropylene
Assignee: EIDP Inc
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Filing: 1989-12-19
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Granted: 1991-10-15
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Expires: 2009-12-19
Abstract
Abstract The present invention relates to multistep syntheses of hexafluoropropylene from acyclic three-carbon hydrocarbons or partially halogenated acyclic three-carbon hydrocarbons. In all these syntheses the first step is a vapor-phase chlorofluorination of the starting material to one or more saturated chlorofluorocarbons. Novel catalysts are also provided.
Inventors
- 👤 James L. Webster
- 👤 Elrey L. McCann
- 👤 Douglas W. Bruhnke
- 👤 Jan J. Lerou
- 👤 William H. Manogue
- 👤 Leo E. Manzer
- 👤 Steven H. Swearingen
- 👤 Swiatoslaw Trofimenko
- 👤 Cristobal Bonifaz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:35
CPC Classifications
C; C07; C07C; C07C21/00; C07C21/02; C07C21/18; C07C17/00; C07C17/013; C07C17/06; C07C17/093; C07C17/10; C07C17/20; C07C17/202; C07C17/206; C07C17/23
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
109 words
A process for the preparation of hexafluoropropylene comprising, under effective reaction conditions: (a) chlorofluorinating a member of the group consisting of propane, propylene and partially halogenated C-3 acyclic hydrocarbons, by contacting with hydrogen fluoride and chlorine in a hydrogen fluoride/chlorine ratio of about from 1 to 7 in the presence of a solid metal-containing catalyst, to produce saturated perhalogenated C-3 chlorofluorocarbons; (b) hydrofluorinating any chlorofluorocarbons of (a) that are not CF 3 CFClCF 3 to produce CF 3 CFClCF 3 by contacting with hydrogen fluoride in the presence of a catalyst; and (c) hydrodehalogenating said CF 3 CFClCF 3 to hexafluoropropylene in the presence of hydrogen and a catalyst.
Claim 2
Dependent Claim
109 words
A process for the preparation of hexafluoropropylene comprising, under effective reaction conditions: (a) chlorofluorinating a member of the group consisting of propane, propylene and partially halogenated C-3 acyclic hydrocarbons, by contacting with hydrogen fluoride and chlorine in a hydrogen fluoride/chlorine ratio of about from 1 to 7 in the presence of a solid metal-containing catalyst, to produce saturated perhalogenated C-3 chlorofluorocarbons; (b) hydrofluorinating any chlorofluorocarbons of (a) that are not CF 3 CFClCF 3 to produce CF 3 CFClCF 3 by contacting with hydrogen fluoride in the presence of a catalyst; and (c) hydrodehalogenating said CF 3 CFClCF 3 to hexafluoropropylene in the presence of hydrogen and a catalyst.
Claim 3
Dependent Claim
15 words
A process of claim 1 wherein step (a) is carried out in the vapor phase.
Claim 4
Dependent Claim
18 words
A process of claim 1 wherein step (c) is carried out in the presence of a K-containing catalyst.
Claim 5
Dependent Claim
45 words
A process of claim 1 wherein the catalyst used in step (c) comprises about 1.0 mole CuO/0.2-1 mole NiO/1-3. mole Cr 2 O 3 /4.-21 mole CaF 2 further containing 1-20 weight percent of a member of the group consisting of K, Cs and Rb.
Claim 6
Dependent Claim
49 words
A process of claim 1 wherein the catalyst used in step (c) comprises about 1.0 mole CuO/0.2-1 mole NiO/1-2 moles Cr 2 O 3 /0.4-1 mole MoO 3 /0.8-4 moles CaF 2 further containing 1-20 weight percent of a member of the group consisting of K, Cs and Rb.
Claim 7
Dependent Claim
22 words
A process of claim 4 in which the member of the group in the catalyst is K present in 2-15 weight percent.
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