Method for converting methyl alcohol to synthesize methylal and ethylene glycol in photocatalytic mode

The invention discloses a method for converting methyl alcohol to synthesize methylal and ethylene glycol in a photocatalytic mode. The method comprises the following steps: adding a semiconductor photocatalyst for modifying a catalyst promoter into absolute methanol, adding concentrated acid, introducing inert atmospheres such as nitrogen gas under magnetic force or mechanical stirring, sufficiently replacing oxygen gas in a system, starting a mercury lamp or an xenon lamp or an LED lamp to react for 1-100 hours, further converting the methyl alcohol into methylal and ethylene glycol throughone-step method, performing solid-liquid separation, and separating methylal and ethylene glycol from the raw material methyl alcohol to separately obtain methylal and ethylene glycol. The method hasthe advantages of being simple in process, high in conversion rate, good in selectivity, low in cost and environmentally friendly. 种光催化甲醇转化合成甲缩醛和乙二醇的方法是将修饰助催化剂的半导体光催化剂加入到无水甲醇中，并加入浓酸，在磁力或机械搅拌下通入氮气等惰性气氛，充分置换体系中的氧气后，开启汞灯或者氙灯或者LED