Method for manufacturing perfluorovinylethers

摘要

A process for the manufacture of a perfluorovinylether by hydrodehalogenation of a halofluoroether (HFE) having general formula (I-A) or (I-B):;
wherein Rf represents a C1-C6 perfluoro(oxy)alkyl group; Rf′, Rf″ and Rf′″, equal to or different from each other, independently represent fluorine atoms or C1-C5 perfluoro(oxy)alkyl groups; X and X′, equal to or different from each other, are independently chosen among Cl, Br or I; Rf* and Rf*′, equal to or different from each other, independently represent fluorine atoms or C1-C3 perfluoro(oxy)alkyl groups; Y1 and Y2, equal to or different from each other, independently represent fluorine atoms or C1-C3 perfluoroalkyl groups. The process comprises contacting the halofluoroether (HFE) with hydrogen in the presence of a catalyst comprising at least one transition metal of group VIII B at a temperature of at most 340° C.

主权项

1. A process for the manufacture of a perfluorovinylether by hydrodehalogenation of a halofluoroether (HFE) having general formula (I-A) or (I-B):
RfO—CRf′X—CRf″Rf′″X′  (I-A)wherein Rf represents a C1-C6 perfluoro(oxy)alkyl group; Rf′, Rf″ and Rf″′, equal to or different from each other, independently represent fluorine atoms or C1-C5 perfluoro(oxy)alkyl groups; X and X′, equal to or different from each other, are independently selected from the group consisting of Cl, Br, and I;wherein Rf* and Rf*′, equal to or different from each other, independently represent fluorine atoms or C1-C3 perfluoro(oxy)alkyl groups;
Y1 and Y2, equal to or different from each other, independently represent fluorine atoms or C1-C3 perfluoroalkyl groups; X and X′ are the same as for formula (I-A); said process comprising contacting said halofluoroether (HFE) with hydrogen in the presence of a catalyst comprising at least one transition metal of group VIII B at a temperature of at most 340° C., wherein the process is carried out in gas-phase.