Synthesis method and device for rapidly producing lactide at high yield

A synthesis device for rapidly producing lactide at high yield, comprising:

• an oligomer preparation system (I) used for carrying out a polymerization synthesis reaction with L-lactic acid, D-lactic acid, or DL-lactic acid as a raw material, so as to obtain oligolactic acid, and introducing a reaction product into an oligomer purification system (II);
• the oligomer purification system (II) used for purifying the reaction product introduced from the oligomer preparation system (I), removing unreacted lactic acid and water, and introducing the purified oligolactic acid into an oligomer depolymerization system (III);
• the oligomer depolymerization system (III) used for depolymerizing the purified oligolactic acid under an action of a catalyst, so as to obtain crude lactide, and introducing the crude lactide into a lactide purification system (IV);
• the lactide purification system (IV) used for purifying the crude lactide, so as to obtain a lactide product and a by-product, and introducing the by-product into a recovery system (V);
• and
• the recovery system (V) used for processing and utilizing the by-product.