With D,L-lactic acid as monomer,D,L-lactide has been synthesized by polymerization and depolymerization in low vacuum level condition.

• 为了提高D,L-丙交酯的收率,研究了D,L-乳酸为单体,低真空条件下使乳酸单体先缩聚后解聚制备D,L-丙交酯的工艺条件。