PROCESS FOR THE PREPARATION OF 1,1,1,3,3,3-HEXAFLUOROPROPANE AND AT LEAST ONE OF 1,1,1,2,3,3-HEXAFLUOROPROPANE, HEXAFLUOROPROPENE AND 1,1,1,2,3,3,3-HEPTAFLUOROPROPANE

摘要

A process is disclosed for the manufacture of 1 ,1 ,1 ,3,3,3- hexafluoropropane and 1 ,1 ,1 ,2,3,3-hexafluoropropane, hexafluoropropene and/or 1 ,1 ,1 ,2,3,3,3-heptafluoropropane. The process involves (a) reacting HF, Cl<SUB>2</SUB>, and at least one halopropene of the formula CX<SUB>3</SUB>CCI=CCIX (where each X is independently F or CI) to produce a product comprising CF<SUB>3</SUB>CCI<SUB>2</SUB>CF<SUB>3</SUB> and CF<SUB>3</SUB>CCIFCCIF<SUB>2</SUB>; (b) reacting CF<SUB>3</SUB>CCI<SUB>2</SUB>CF<SUB>3</SUB> and CF<SUB>3</SUB>CCIFCCIF<SUB>2</SUB> produced in (a) with hydrogen, optionally in the presence of HF, to produce a product comprising CF<SUB>3</SUB>CH<SUB>2</SUB>CF<SUB>3</SUB> and at least one of CHF<SUB>2</SUB>CHFCF<SUB>3</SUB>, CF<SUB>3</SUB>CF=CF<SUB>2</SUB> and CF<SUB>3</SUB>CFHCF<SUB>3</SUB> ; and (c) recovering from the product produced in (b), CF<SUB>3</SUB>CH<SUB>2</SUB>CF<SUB>3</SUB> and at least one of CHF<SUB>2</SUB>CHFCF<SUB>3</SUB>, CF<SUB>3</SUB>CF=CF<SUB>2</SUB> and CF<SUB>3</SUB>CFHCF<SUB>3</SUB>. In (a), the CF<SUB>3</SUB>CCI<SUB>2</SUB>CF<SUB>3</SUB> and CF<SUB>3</SUB>CCIFCCIF<SUB>2</SUB> are produced in the presence of a chlorofluorination catalyst including (i) a crystalline alpha-chromium oxide where at least 0.05 atom % of the chromium atoms in the alpha-chromium oxide lattice are replaced by divalent copper, and/or (ii) a chromium-containing composition of (i) which has been treated with a fluorinating agent.