METHOD OF PRODUCING FLUORINATED OLEFINS (VERSIONS) Russian patent published in 2012 - IPC C07C17/25 C07C21/18 C07C17/354 C07C19/08 C07C19/10 C07C19/14 C07C19/16 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing a fluorinated olefin product. The method involves the following: (a) bringing a stream of material containing reactants - fluorinated olefin and hydrogen - into contact with a first portion of a catalyst to convert said reactants to a hydrofluoroalkane with a first degree of conversion and obtain a first effluent containing said hydrofluoroalkane, unreacted fluorinated olefin and hydrogen; (b) bringing said first effluent into contact with a second portion of catalyst to convert said unreacted fluorinated olefin to a hydrofluoroalkane with a second degree of conversion, wherein the second portion of catalyst is bigger than the first and the second degree of conversion is higher than the first; (c) dehydrohalogenation of at least a portion of said hydrofluoroalkane from step (b) to form a stream of products containing fluorinated olefin and HF; and (d) optional separation of HF from said stream of products.

EFFECT: use of the present method improves overall degree of conversion and increases purity of the product.

15 cl, 10 ex, 7 tbl, 2 dwg