Process for the manufacture of 2-chloro-3,3,3-trifluoropropene by gas phase fluorination of pentachloropropane
A technology of pentachloropropane and trifluoropropene, applied in the field of producing 2-chloro-3,3,3-trifluoropropene through gas-phase fluorination of pentachloropropane, which can solve the problems of not providing operation examples
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Embodiment 1
[0052] At 79.4cm 3 load on AlF 3 Fluorination of 240db (1,1,1,2,3-pentachloropropane) was carried out in the aforementioned reactor over a Ni-Cr catalyst.
[0053] The catalyst used is a mixed catalyst with a nickel / chromium atomic ratio Ni / Cr=1 supported on aluminum fluoride, and is impregnated with nickel and chromic anhydride (CrO 3 ) solution preparation. After impregnation and drying, the solid is treated in the presence of a mixture of hydrofluoric acid and nitrogen at a concentration of 5-10% by volume of the acid in nitrogen at a temperature of 320°C to 390°C.
[0054] 15 g / hour of anhydrous HF and about 4.5 g / hour of 1,1,1,2,3-pentachloropropane were continuously fed to the reactor for 86 hours at atmospheric pressure. Thus, the contact time was 7.4 seconds, the molar ratio of HF to 240 was 36, and the reaction temperature was 340°C. The amount of oxygen is about 4 mole % relative to 240db. The results are given in Table 1.
Embodiment 2
[0056] Fluorination of a mixture of 65.9 mol % of 240db or 1,1,1,2,3-pentachloropropane and 34.9 mol % of 240aa or 1,1,2,2,3-pentachloropropane was carried out according to the previous example 1 . The reactor was continuously fed with 16 g / hour of anhydrous HF and about 5.1 g / hour of 1,1,1,2,3-pentachloropropane at atmospheric pressure. Thus, the contact time was 6.9 seconds, the molar ratio was 34, and the reaction temperature was 340°C. The amount of oxygen is about 4 mole % relative to the total number of moles of 1,1,1,2,3-pentachloropropane and 1,1,2,2,3-pentachloropropane. The results are given in Table 1.
Embodiment 3 and 4
[0058] Example 2 was repeated at different temperatures as indicated in Table 1.
[0059] Table 1
[0060]
[0061] After 86 hours, no inactivation was observed in Example 1. Also, it is worth noting that the selectivity remains very high.
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