METHOD FOR PURIFYING (Z)-1-CHLORO-2,3,3,3-TETRAFLUOROPROPENE

A method of purifying (Z)-1-chloro-2,3,3,3-tetrafluoropropene (1224yd (Z)), the method being capable of efficiently separating 2-chloro-1,1,1,2-tetrafluoropropane (244bb) from a composition containing 1224yd (Z) and 244bb, and obtaining a purified product of 1224yd (Z) containing a high concentration of 1224yd (Z). The method of purifying 1224yd (Z) includes: distilling a composition comprising 1224yd (Z) and 244bb in a presence of an extracting solvent comprising at least one compound selected from the group consisting of an alcohol, an ether, a nitrile, a ketone, a carbonate ester, an amide, an ester, a sulfoxide, a hydrocarbon, a chlorohydrocarbon, and a fluorohydrocarbon; and thereby, separating at least a part of 244bb from the composition.