Process for the manufacture of hydrochlorofluoroolefins
The present invention provides a process for the manufacture of trans 1-chloro-3,3,3-trifluoropropene (E-1233zd). The first step of the process comprises the fluorination of 1,1,3,3-tetrachlororopropene (1230za, CCh═CH—CHCh) and/or 1,1,1,3,3-pentaachloropropane (240fa) to a mixture of cis 1233zd (Z-1233zd) and trans 1233zd (E-1233zd). The second step of the process comprises a separation of the mixture formed in the first step to isolate cis 1233zd (Z-1233zd) from the mixture. The third step of the process comprises isomerization of cis 1233zd (Z-1233zd) to trans 1233zd (E-1233zd).
1. A process for manufacturing trans 1-chloro 3,3,3 trifluoro propene (E-1233zd) from 1,1,3,3-tetrachloropropene (1230za) and/ or 1,1,1,3,3-pentachloropropane (240fa) comprising the steps of:
fluorination of 1,1,3,3-tetrachloropropene (1230za) and/ or 1,1,1,3,3-pentachloropropane (240fa) to a mixture comprising cis 1233zd (Z-1233zd) and trans 1233zd (E-1233zd); followed by
separation of said cis 1233zd (Z-1233zd) from said trans 1233zd (E-1233zd); followed by
isomerization of said cis 1233zd (Z-1233zd) to form trans 1233zd (E-1233zd).
2. The process of claim 1 wherein said isomerization process is carried out in the gas phase or the liquid phase.
3. The process of claim 2 wherein said isomerization is carried out in a liquid phase with a homogenous catalysts selected from the group consisting of soluble Lewis acid catalysts and Bronsted acid catalysts.
4. The process of claim 3 wherein said soluble Lewis acid catalyst is selected from Sb V ; Ti IV ; Sn IV ; Mo VI ; Nb V ; Ta V ; oxide supported catalysts; fluorinated alumina; fluorinated chromia; prefluorinated activated carbon; graphite carbon; SiC; Sb 5 .
5. The process of claim 4 wherein said oxide supported catalyst is selected from the group consisting of Al 2 O 3 and TiO 2 .
6. The process of claim 3 wherein said Bronsted acid catalyst is selected from the group consisting of triflic acid, methane sulfonic acid, sulfuric acid and sulfonic acid.
7. The process of claim 2 wherein said isomerization is carried out in the gas phase with a high surface area heterogeneous Cr catalyst, supported or unsupported.
8. The process of claim 7 wherein said catalyst further comprising a co-catalyst selected from the group consisting of Co, Ni, Zn and Mn.