Process for manufacture of 2,3,3,3-tetrafluoropropene

A process for a manufacture of a compound 2,3,3,3-tetrafluoropropene (1234yf) comprising steps of:

• (a) providing as a starting material (i) the compound 124 (2-chloro-1,1,1,2-tetrafluoroethane) and/or (ii) the compound 125 (pentafluoroethane);
• (b) generating a carbene (CF3-C(:)F) out of (i) the compound 124 (2-chloro-1,1,1,2-tetrafluoroethane) and/or (ii) the compound 125 (pentafluoroethane) provided under (a), wherein
• (i) the carbene generation (CF3-C(:)F) is performed in a liquid phase with a phase transfer catalyst and a base;
• or
• (ii) the carbene generation (CF3-C(:)F) is performed in gas phase (vapor-phase) by high temperature thermolysis;
• (c) mixing and reacting the carbene (CF3-C(:)F) formed in (b) with methyl chloride (CH3Cl) and elimination of HCl (hydrogen chloride);
• (d) withdrawing the reaction mixture obtained in (c) from the said reactor in (c) to yield a 2,3,3,3-tetrafluoropropene (1234yf) comprising product, preferably a 2,3,3,3-tetrafluoropropene (1234yf) product;
• (e) optionally withdrawing (i) any or (ii) any HF, as formed in the carbene generation in (b), and the HCl formed in the reactor in (c), as an effluent from reaction mixture obtained in (d);
• and
• (f) optionally purifying and/or isolating the 2,3,3,3-tetrafluoropropene (1234yf) product obtained in (d), or optionally in (e), to yield purified and/or isolated 2,3,3,3-tetrafluoropropene (1234yf).