Method for producing fluorinated organic compounds

Details Method for producing fluorinated organic compounds Method for producing fluorinated organic compounds

2007-01-03

2011-12-27

Sullivan, Daniel (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Halogen containing

Reexamination Certificate

active

08084653

ABSTRACT:
Disclosed are processes for the production of fluorinated olefins, preferably adapted to commercialization of CF3CF═CH2(1234yf). Three steps may be used in preferred embodiments in which a feedstock such as CCl2═CClCH2Cl (which may be purchased or synthesized from 1,2,3-trichloropropane) is fluorinated (preferably with HF in gas-phase in the presence of a catalyst) to synthesize a compound such as CF3CCl═CH2, preferably in a 80-96% selectivity. The CF3CCl═CH2is preferably converted to CF3CFClCH3(244-isomer) using a SbCl5as the catalyst which is then transformed selectively to 1234yf, preferably in a gas-phase catalytic reaction using activated carbon as the catalyst. For the first step, a mixture of Cr2O3and FeCl3/C is preferably used as the catalyst to achieve high selectivity to CF3CCl═CH2(96%). In the second step, SbCl5/C is preferably used as the selective catalyst for transforming 1233xf to 244-isomer, CF3CFClCH3. The intermediates are preferably isolated and purified by distillation and used in the next step without further purification, preferably to a purity level of greater than about 95%.

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