Method for preparing 1,3,3,3-tetrafluoropropene

The invention discloses a method for preparing 1,3,3,3-tetrafluoropropene. The method comprises the following preparation procedures: firstly, adding 350-550g of alkaline aqueous solution into a reactor, and adding a solvent into the reactor, so as to form a solvent system for reaction; then, heating to the reaction temperature of 10-150 DEG C while stirring, adding 100-320g of 1,1,1,3,3-pentafluoropropane into the reactor after the heating is ended, and controlling the mole ratio of alkali in the alkaline aqueous solution and 1,1,1,3,3-pentafluoropropane to (0.75-7): 1; then, starting to react for 5-60 minutes, thereby finally producing the reaction product 1,3,3,3-tetrafluoropropene. According to the method, improvement is carried out based on the prior art, and the disadvantages of the existing 1,3,3,3-tetrafluoropropene preparation methods are overcome; 1,1,1,3,3-pentafluoropropane is selected as a reaction raw material and is added into the solvent containing alkaline aqueous solution for reacting, and 1,3,3,3-tetrafluoropropene is prepared finally; not only is the production efficiency remarkably increased, but also the preparation process is more economical and environment-friendly.