Organic compounds -- part of the class 532-570 series – Organic compounds – Halogen containing
Patent
1993-11-01
1995-08-29
Siegel, Alan
Organic compounds -- part of the class 532-570 series
Organic compounds
Halogen containing
570165, 570167, 570169, 570176, C07C 1908, C07C 1708
Patent
active
054462169
ABSTRACT:
A process is disclosed for producing a product comprising CCl.sub.2 FCF.sub.3 substantially free of CClF.sub.2 CClF.sub.2. The process includes (i) contacting a mixture of perhalogenated hydrocarbons which is essentially free of CClF.sub.2 CClF.sub.2 and comprises from 20 to 80 mole percent CCl.sub.3 CF.sub.3 and from 5 to 80 mole percent total of at least one compound selected from the group consisting of CCl.sub.2 .dbd.CCl.sub.2, CCl.sub.3 CCl.sub.2 F, CCl.sub.2 FCCl.sub.2 F and CClF.sub.2 CCl.sub.3 with HF and optionally Cl.sub.2 (provided that when the mixture comprises CCl.sub.2 .dbd.CCl.sub.2, Cl.sub.2 is supplied in a mole ratio of Cl.sub.2 to CCl.sub.2 .dbd.CCl.sub.2 of at least 1:2) over a fluorination catalyst at an elevated temperature no higher than 375.degree. C. to provide a product mixture comprising CCl.sub.2 FCClF.sub.2 and C.sub.2 Cl.sub.2 F.sub.4 wherein the ratio of CClF.sub.2 CClF.sub.2 to CCl.sub.2 FCF.sub.3 is less than about 1:50; (ii) recovering said C.sub.2 Cl.sub.2 F.sub.4 from the product mixture; (iii) isomerizing CCl.sub.2 FCClF.sub.2 from the product mixture to CCl.sub.3 CF.sub.3 in the presence of an isomerization catalyst; and (iv) recycling the CCl.sub.3 CF.sub.3 produced by the isomerization of step (iii) to step (i). The process may be used to produce high purity CH.sub.2 FCF.sub.3 when combined with the hydrodehalogenation of the high purity CCl.sub.2 FCF.sub.3 from step (ii) in the presence of HF.
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E. I. Du Pont de Nemours and Company
Siegel Alan
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