Polymerization inhibitor constant-temperature mixing equipment in methacrylic acid production process

The utility model provides polymerization inhibitor constant-temperature mixing equipment in a methacrylic acid production process, which comprises a container, the container is divided into an upper-layer mixing container and a lower-layer constant-temperature container, and an outlet of the upper-layer mixing container is connected with an inlet of the lower-layer constant-temperature containerthrough a communicating pipeline; wherein the upper-layer mixing container is communicated with a solvent storage tank positioned above the container, a net bag pipe and a stirring device driven by amotor are arranged in the upper-layer mixing container, and the net bag pipe is communicated with a polymerization inhibitor powder storage tank positioned above the container; wherein a heat exchangecoil pipe is arranged in the lower-layer constant-temperature container, a cooling medium circulates in the heat exchange coil pipe, and an outlet of the lower-layer constant-temperature container iscommunicated with a next-st