Benzyl chloride is widely used in industry. It is mainly used in the fields of pesticides, medicine, spices, dye additives and synthetic additives to develop and produce benzaldehyde, butyl benzyl phthalate, aniline, phoxim, benzylpenicillin, benzyl alcohol, phenylacetonitrile, phenylacetic acid and other products. Benzyl chloride is an irritant compound of benzyl halide. In terms of pesticides, it can not only directly synthesize organophosphorus fungicides daowenjing, isodaowenjing and , but also be used as an important raw material for many other intermediates, such as the synthesis of phenylacetonitrile, benzoyl chloride, m-phenoxybenzaldehyde, etc. in addition, benzyl chloride is widely used in medicine, spices, dye additives Synthetic resin is widely used. It is an important intermediate in chemical and pharmaceutical production. Then the waste liquid or waste produced in the production process of enterprises inevitably contains a large number of benzyl chloride intermediates.