METHOD OF DECARBOXYLATION OF DERIVATIVES OF PERFLUORINATED CARBOXYLIC ACIDS Russian patent published in 2002 - IPC

FIELD: chemical technology. SUBSTANCE: invention relates to a method of decarboxylation of halide anhydrides or perfluorinated carboxylic acids esters to synthesize the corresponding perfluoroolefins or perfluoroalkylvinyl esters that are used as the parent raw for synthesis of polymeric materials with improved exploitation properties. Decarboxylation reaction of acids is carried out at temperature 100-300 C in the presence of a catalyst comprising of a carrier taken among an order including coal, magnesium oxide, calcium oxide, barium oxide, zinc oxide, aluminium oxide, nickel oxide or silicon oxide promoted with an alkaline metal halide. The content of an alkaline metal halide in the catalyst is from 20 to 50 weight %. The yield of synthesized perfluoroolefins or perfluoroalkylvinyl esters is up to 95%. Method ensures to carry out the stable process at a lower temperature. EFFECT: improved method of decarboxylation, increased yield, simplified process. 3 cl, 1 tbl, 9 ex