| abstract |
(57) [Summary] [Objective] To provide a method for refining melt crystallization of lactide. (1) A molten mixture of lactide and impurities is cooled to a freezing point of lactide or slightly below the freezing point of lactide, and (2) a solid phase having an impurity content lower than that of the molten mixture by partially crystallizing the molten mixture, and Forming a liquid phase with a higher impurity content than the molten mixture, and (3) Separating the solid phase from the liquid phase comprises forming the separated solid phase. |