Method for preparing ethylene sulfite of solvent-free system by using microchannel reactor

The invention belongs to the technical field of preparation of ethylene sulfite, and particularly discloses a method for preparing ethylene sulfite of a solvent-free system by a microchannel reactor. Comprising the following steps that the liquid holdup of the microchannel reactor is 10 ml-100 ml, the reaction temperature is-5 DEG C-70 DEG C, a normal pressure reaction is carried out, a gas-liquid separation device is connected to a discharge port, and tail gas is connected to an alkali liquor absorption device. The method comprises the following steps: introducing ethylene glycol and thionyl chloride into a micro-channel reactor by using a high-pressure plunger pump at a flow rate of 15-30ml/min and a flow rate of 12-30ml/min respectively, reacting for 1-3 minutes, and receiving a reaction solution after a reaction system is stable for 5 minutes. And washing the reaction liquid with deionized water, separating the liquid, and collecting an organic phase. And drying the organic phase with anhydrous magnesium