Method for producing fluoroethylene by gas phase fluorination of acetylene

The invention relates to an acetylene gas phase fluorination fluoroethylene production method, which is as follows: acetylene and hydrogen fluoride are mixed according to molar ratio 1 to 1-10 at 260 to 360 DEG C, 0.1 to 1.0 MPa for 600 to 2000 hours and are reacted in a reactor one, and the tail gas is separated by a separation column 1, and the hydrogen fluoride separated out is reused; VF enters into a distillation column for distillation; after heated, the acetylene and HFC-152a flow into a reactor two; the cracking reaction of HFC-152a and the combination reaction between acetylene and 1, 1-difuoroethane take place under the function of fluorination catalyst at 260 to 360 DEG C and 0.1 to 1.0 MPa for 600 to 2000 hours in the reactor two, and the tail gas is separated by a separation tower 2, and the acetylene and hydrogen fluoride separated out is reused; after being washed in alkali, dried, condensed and liquefied, the VF and HFC-152a enter into the distillation column; finally, after drying, th