Due to the particularity of the production of pharmaceutical companies, we plan to use high-efficiency packed tower separation, membrane separation and high-efficiency refining system for the recovery of acetonitrile wastewater, so that anhydrous acetonitrile can be returned to the production system for reuse, and the wastewater that meets the standard will be discharged to the sewage treatment section. The whole technological process is reasonable, automatic control, simple operation, and all equipments are in the workshop.