The invention relates to a process for the manufacture of a-iodoperfluoroalkanes and ,-diiodoperfluoroalkanes of general formula: (1) A(C.sub.2F.sub.4).sub.n1, wherein: A is selected from F, CF.sub.3 and I and n is an integer equal to or higher than 1, with the proviso that, when A is F, n is an integer higher than 1 said process comprising heating a mixture [mixture (M1)] containing: a compound selected from I.sub.2, CF.sub.3I, CF.sub.3CF.sub.2I and C.sub.2F.sub.4I.sub.2; TFE; and CO.sub.2 at definite temperatures and concentrations of CO.sub.2.

The present invention relates to the technical field of the fluorine chemical industry, and disclosed are a preparation method for a perfluoroolefin oligomer and an application thereof. The preparation method comprises: selecting a combination of two or more raw material monomers selected from among the following (i) and (ii) undergoing an oligomerization reaction under the catalysis of a metal fluoride salt to obtain a perfluoroolefin oligomer product the total carbon number of which is not less than 7, wherein (i) is tetrafluoroethylene, a tetrafluoroethylene oligomer or a mixture thereof, and (ii) is hexafluoropropylene, a hexafluoropropylene oligomer or a mixture thereof. The present application solves the difficult problem of high-selectivity preparation of perfluoroolefin oligomers having high carbon numbers.

The present invention relates to the technical field of the fluorine chemical industry, and disclosed are a preparation method for a perfluoroolefin oligomer and an application thereof. The preparation method comprises: selecting a combination of two or more raw material monomers selected from among the following (i) and (ii) undergoing an oligomerization reaction under the catalysis of a metal fluoride salt to obtain a perfluoroolefin oligomer product the total carbon number of which is not less than 7, wherein (i) is tetrafluoroethylene, a tetrafluoroethylene oligomer or a mixture thereof, and (ii) is hexafluoropropylene, a hexafluoropropylene oligomer or a mixture thereof. The present application solves the difficult problem of high-selectivity preparation of perfluoroolefin oligomers having high carbon numbers.

Processes are provided for (i) producing Z-1,1,1,4,4,4-hexafluoro-2-butene (ZCF.sub.3CHCHCF.sub.3) from E-1,1,1,4,4,4-hexafluoro-2-butene (E-CF.sub.3CHCHCF.sub.3), comprising the steps of (a) reacting the E-1,1,1,4,4,4-hexafluoro-2-butene (E-CF.sub.3CHCHCF.sub.3) with chlorine to form dichloro-1,1,1,4,4,4-hexafluorobutane (CF.sub.3CHClCHClCF.sub.3), (b) recovering the dichloro-1,1,1,4,4,4-hexafluorobutane from step (a), (c) reacting the recovered dichloro-1,1,1,4,4,4-hexafluorobutane with base to form 1,1,1,4,4,4-hexafluoro-2-butyne (CF.sub.3CCF.sub.3), (d) recovering the 1,1,1,4,4,4-hexafluoro-2-butyne from step (c) and (e) reacting the recovered hexafluoro-2-butyne with hydrogen to form said Z-1,1,1,4,4,4-hexafluoro-2-butene, optionally wherein said E-1,1,1,4,4,4-hexafluoro-2-butene starting material is obtained by converting 1,1,1,4,4,4-hexafluoro-2-butane (F.sub.3CHCl.sub.2) to a mixture of Z-1,1,1,4,4,4-hexafluoro-2-butene and E-1,1,1,4,4,4-hexafluoro-2-butene and recovering the E-1,1,1,4,4,4-hexafluoro-2-butene from said mixture, whereby the E-1,1,1,4,4,4-hexafluoro-2-butene used in step (a) is the recovered E-1,1,1,4,4,4-hexafluoro-2-butene, and (ii) step (a) as a subcombination of the process (i).

Processes are provided for (i) producing Z-1,1,1,4,4,4-hexafluoro-2-butene (ZCF.sub.3CHCHCF.sub.3) from E-1,1,1,4,4,4-hexafluoro-2-butene (E-CF.sub.3CHCHCF.sub.3), comprising the steps of (a) reacting the E-1,1,1,4,4,4-hexafluoro-2-butene (E-CF.sub.3CHCHCF.sub.3) with chlorine to form dichloro-1,1,1,4,4,4-hexafluorobutane (CF.sub.3CHClCHClCF.sub.3), (b) recovering the dichloro-1,1,1,4,4,4-hexafluorobutane from step (a), (c) reacting the recovered dichloro-1,1,1,4,4,4-hexafluorobutane with base to form 1,1,1,4,4,4-hexafluoro-2-butyne (CF.sub.3CCF.sub.3), (d) recovering the 1,1,1,4,4,4-hexafluoro-2-butyne from step (c) and (e) reacting the recovered hexafluoro-2-butyne with hydrogen to form said Z-1,1,1,4,4,4-hexafluoro-2-butene, optionally wherein said E-1,1,1,4,4,4-hexafluoro-2-butene starting material is obtained by converting 1,1,1,4,4,4-hexafluoro-2-butane (F.sub.3CHCl.sub.2) to a mixture of Z-1,1,1,4,4,4-hexafluoro-2-butene and E-1,1,1,4,4,4-hexafluoro-2-butene and recovering the E-1,1,1,4,4,4-hexafluoro-2-butene from said mixture, whereby the E-1,1,1,4,4,4-hexafluoro-2-butene used in step (a) is the recovered E-1,1,1,4,4,4-hexafluoro-2-butene, and (ii) step (a) as a subcombination of the process (i).

A method of producing carbon tetrachloride includes providing a chloromethanes stream, combining the chloromethanes stream with chlorine and additional carbon tetrachloride to form a reaction mixture, wherein the reaction mixture includes at least stoichiometric levels of chlorine, introducing electromagnetic radiation to the reaction mixture and subjecting the reaction mixture to suitable reaction conditions to form product carbon tetrachloride, and collecting a product stream including the product carbon tetrachloride.

A method of producing carbon tetrachloride includes providing a chloromethanes stream, combining the chloromethanes stream with chlorine and additional carbon tetrachloride to form a reaction mixture, wherein the reaction mixture includes at least stoichiometric levels of chlorine, introducing electromagnetic radiation to the reaction mixture and subjecting the reaction mixture to suitable reaction conditions to form product carbon tetrachloride, and collecting a product stream including the product carbon tetrachloride.

A method of producing carbon tetrachloride includes providing a chloromethanes stream, combining the chloromethanes stream with chlorine and additional carbon tetrachloride to form a reaction mixture, wherein the reaction mixture includes at least stoichiometric levels of chlorine, introducing electromagnetic radiation to the reaction mixture and subjecting the reaction mixture to suitable reaction conditions to form product carbon tetrachloride, and collecting a product stream including the product carbon tetrachloride.

The present application relates to processes of preparing (E)-1,1,1,4,5,5,5-heptafluoro-4-(trifluoromethyl)pent-2-ene.

The present application relates to processes of preparing (E)-1,1,1,4,5,5,5-heptafluoro-4-(trifluoromethyl)pent-2-ene.