Device for automatically monitoring acetic anhydride content

The utility model belongs to the field of production of crude acetic anhydride, and particularly relates to a device for automatically monitoring the content of acetic anhydride. The feeding device comprises a feeding regulating valve and a discharging valve, the device is characterized by further comprising an on-line refractometer and a controller, the on-line refractometer is arranged on a bypass branched by the mixture circulating pipeline, the controller is electrically connected with the material supplementing adjusting valve, the discharging valve and the on-line refractometer, and thecontroller controls the material supplementing adjusting valve and the discharging valve according to output information of the on-line refractometer. Furthermore, the controller is a programmable logic controller (PLC). By using the device, the technical effects of real-time detection and automatic control of acetic anhydride in the production process are achieved, the device is high in working efficiency, existing equip