Preparation method for intermediate epichlorophdrin of herbicide pretilachlor

The invention relates to a method for preparing the designed herbicide pretilachlor intermediate chloride ether. Under the action of organic amine catalyst, the chloride ether can be obtained by ethylene glycol monopropyl ether and bis (trichloromethyl) hydroxyphenyl in the organic solvent through the following chemical equation: HOC2H4OC3H7+Cl3COCOOCCl3 arrow ClC2H4OC3H7+CO2+HCl. The method replaces the traditional chlorination reagent with the bis (trichloromethyl) hydroxyphenyl, such as, thionly chloride, phosphorus oxychloride and hydrogen chloride, etc., and the potential safety hazard can be eliminated from the process source by using the novel chlorination reagent. Simultaneously, the emissions of pollutants are greatly reduced, and the method is a cleaning process with mild reaction conditions, safe and reliable operating process and high product yield, and has good industrialization implementation value and social economic benefits.