Method for producing and purifying 2,3,3,3-tetrafluoro-1-propene

A process for purifying 2,3,3,3-tetrafluoro-1-propene (1234yf) using a first composition comprising 2,3,3,3-tetrafluoro-1-propene and at least one compound selected from the group consisting of 1,1-difluoroethane (152a), chloropentafluoroethane (115) and trans-1,3,3,3-tetrafluoro-1-propene (1234ze-E), said process comprising:

• a) placing said first composition in contact with at least one organic extracting agent to form a second composition;
• b) distilling said second composition by extractive distillation to form:
• i) a third composition comprising said organic extracting agent and said at least one compound selected from the group consisting of 1,1-difluoroethane (152a), chloropentafluoroethane (115) and trans-1,3,3,3-tetrafluoro-1-propene (1234ze-E);
• and
• ii) a stream comprising 2,3,3,3-tetrafluoro-1-propene;
• and
• c) recovering and separating said third composition to form a stream comprising said organic extracting agent and a stream comprising said at least one compound selected from the group consisting of 1,1-difluoroethane (152a), chloropentafluoroethane (115) and trans-1,3,3,3-tetrafluoro-1-propene (1234ze-E).