Manufacturing technology of p-xylylene dichloride

The invention provides a manufacturing technology of p-xylylene dichloride. The manufacturing technology comprises the following steps: (1) reaction: adding p-xylene in a chlorination reactor, turning on a reaction light source, and then turning on jacket steam of a reaction still to begin to heat and raise the temperature; when the temperature is raised to 80 DEG C, stopping steam heating, and introducing Cl2 to the reaction still; two hours after Cl2 introduction, increasing the chlorine flow, sampling to conduct center control analysis, and stopping introduction of the chlorine after meeting the process control requirements; (2) flash evaporation: simply distilling the mixed liquor obtained in the step (1), collecting the mixture of p-xylene and p-methylbenzyl chloride, and centrally collecting the bed charge inside the distillation still; (3) rectification: transferring the bed charge centrally collected in the step (2) to a benzylidene chloride rectifying column to be decompressed and rectified; collecti