Method for continuously synthesizing 3, 5-dimethylpyrazole

The invention relates to a method for continuously preparing 3, 5-dimethylpyrazole, and belongs to the technical field of chemical preparation. Comprising the following operation steps: (1) selecting hydrazine hydrate with the content required to be 20-80% and acetylacetone with the content required to be more than 99%, which are suitable for the experiment; (2) a micro-channel reactor, a shell tubular reactor capable of heating and cooling and module reactors made of various materials can be selected, a stainless steel tubular reactor and two metering pumps are recommended to be used, the flow can be controlled, and a low-temperature circulating tank is used for controlling the temperature; the method for continuously preparing the 3, 5-dimethylpyrazole is suitable for continuous production, high in product selectivity and almost free of byproducts, the conversion rate of the raw material acetylacetone reaches 100%, the reaction time is greatly shortened to be within 10 seconds from 3 hours, the method is su