Process for the production of 1,3,3,3-tetrafluoropropene

摘要

The present invention provides a simple three step process for the production of 1,3,3,3-tetrafluoropropene (HFO-1234ze). In the first step, carbon tetrachloride is added to vinyl fluoride to afford the compound CCl3CH2CHClF (HCFC-241fb). HCFC-241fb is then fluorinated with anhydrous HF to afford CF3CH2CHClF (HCFC-244fa) in the second step. Dehydrochlorination of HCFC-244fa, in the third step, affords the desired product, CF3CH═CHF (HFO-1234ze). Following similar chemistry, vinyl chloride may be used in place of vinyl fluoride.

主权项

1. A process for the production of 1,3,3,3-tetrafluoropropene (HFO-1234ze) comprising the continuous steps of:
(a) reacting carbon tetrachloride with vinyl fluoride to afford a yield of up to about 60% by weight of the compound CCl3CH2CHClF (HCFC-241fb); (b) fluorinating the HCFC-241fb formed in step (a) with an excess amount of HF in the presence of a fluorination catalyst to afford a yield of up to about 40% by weight of the compound CF3CH2CHClF (HCFC-244fa); and (c) dehydrochlorinating the HCFC-244fa formed in step (b) to produce a yield of up to about 40% by weight of the compound CF3CH═CHF (HFO-1234ze); wherein the reaction of carbon tetrachloride with the vinyl halide compound is conducted in the presence of triethylphosphate and an iron material selected from the group consisting of supported or unsupported iron powder, iron nanopowder and iron nanoparticles, at a temperature of from about 120° C. to 130° C.