Technique for using methylbenzene to prepare benzaldehyde and benzene methanol by multistage oxidation and equipment

The invention discloses a technique for using methylbenzene to prepare benzaldehyde and benzene methanol by air oxidation and equipment. In a reaction separating system consisting of a multistage oxidation reactor as well as a gas-liquid separator, a lateral line fractionating column or a fractionating column system, 0.1 to 50ppm of monometallic porphyrin or u-oxygen bimetallic porphyrin is separately used as a catalyst, or metallic porphyrin and phthalimide (or salt) are used as a mixed catalyst according to the weight ratio of 1:20 to 100; when the reaction temperature is 80 to 200 DEG C, the methylbenzene is maintained in a multistage oxidizer for 60 to 180 minutes and prepared into the benzaldehyde and benzene methanol by catalytic oxidation; and the gas-liquid separation and purification are carried out. Compared with the prior art, the technique and equipment can obviously improve the conversion rate of the methylbenzene, and the conversion rate of the methylbenzene can reach to be more than 95% by expe