Method for preparing 2, 5-furandicarboxaldehyde by using gas-liquid two-phase system

The invention relates to a method for preparing 2, 5-furandicarboxaldehyde by using a gas-liquid two-phase system, which comprises the following steps: by taking cheap and easily available biomass fuel as a raw material, a composite oxide VPO as a main catalyst, SiO2 in a secondary catalyst ZSM-5 molecular sieve as a carrier and the gas-liquid two-phase reaction system as a reaction environment basis, extracting HMF from the biomass fuel, and preparing 2, 5-furandicarboxaldehyde from the biomass fuel. According to the method, 2, 5-furandicarboxaldehyde is prepared by taking the extracted HMF as a secondary raw material, and a 2, 5-furandicarboxaldehyde product is rapidly and efficiently separated from a gas phase and a liquid phase. The whole preparation process is small in reaction condition limitation, the obtained product is easy to separate, the finished product yield is high, the preparation cost is low, the economic benefit is remarkable, and the environmental protection property is good. 利用气液双相体系制备2，5-