Equipment for circularly preparing lactide

The invention provides equipment for circularly preparing lactide. The equipment comprises a mixing tank, a reaction tank, a vacuum condenser, a purification tank and a vacuum pump, wherein a first stirrer is mounted on the mixing tank, a return port and a feed port are formed in the top of the mixing tank body, the feed port communicates with the top of the reaction tank, a gas guide port is also formed in the top of the reaction tank and communicates with the vacuum condensation pipe, a heating jacket covers the outer wall of the reaction tank, at least two layers of turntable sieve plate paddles are arranged on a middle shaft in the reaction tank, at least two layers of fixed sieve plate groups are arranged on the inner wall of the reaction tank, the turntable sieve plate paddles and the fixed sieve plates are staggered at intervals and are provided with a plurality of sieve holes, and the bottom of the reaction tank is connected with the top of the purification tank through a circulating pipeline. Accordi