HEAXAFLUOROBUTADIENE PRODUCTION PROCESS Russian patent published in 2006 - IPC C07C21/20 C07C21/19 C07C17/25 

FIELD: industrial organic synthesis.

SUBSTANCE: invention relates to perfluoroolefins production technology, notably to heaxafluorobutadiene CF₂=CF-CF=CF₂. Process comprises reaction of 1,2,3,4-tetrachlorohexafluorobutane with zinc in aqueous medium at 30 to 90°C. Reaction is carried out by metering 1,2,3,4-tetrachlorohexafluorobutane into reaction vessel containing zinc and water, while simultaneously desired product formed is recovered. Advantageously, process is conducted in presence of promoter selected from acids such as sulfuric acid and hydrochloric acid, soluble weak base salts such as zinc and ammonium halides, interphase transfer catalysts such as quaternary ammonium salts, quaternary phosphonium salts, tetrakis(dialkylamino)phosphonium salts, and N,N',N"-hexaalkyl-substituted guanidinium salts, or mixtures of indicated substances.

EFFECT: increased purity of heaxafluorobutadiene and simplified technology.

4 cl, 7 ex