Method for producing R32 and R31 through liquid-phase pipeline poly-generation manner

A method for producing R32 and R31 through a liquid-phase pipeline poly-generation manner is disclosed. The method comprises the following steps: (1) pumping raw materials from an inlet of a pipelinereactor so that dichloromethane and hydrogen fluoride are brought into contacted in the pipeline reactor in the presence of a fluorination catalyst, and a fluorination reaction is carried out at a fluorination reaction temperature under a fluorination reaction pressure to obtain a reaction liquid flow containing R31; (2) separating a part of the R31 from the reaction liquid flow in the step (1), and carrying out a fluorination reaction on the residual reaction liquid flow in the pipeline reactor to obtain a reaction liquid flow containing R32; and (3) separating the R32 from the reaction liquid flow containing R32 in the step (2), and circulating the residual reaction liquid flow to the step (1). According to the method for poly-generation of the R31 and the R32 provided by the invention,the production of the R31