PROCESS FOR PRODUCTION OF POLYLACTIC ACID

摘要

PROBLEM There is provided a method for producing polylactic acid, which is capable of obtaining polylactic acid at low cost, and having high molecular weight. SOLUTION A method for producing polylactic acid by polymerizing molten lactide using at least one reactor having plug flow characteristics with ¾ (Ä), calculated from the following FORMULA (1), of 0.3 or smaller: ¾ Ä = ˆ« 0 ˆž �¢ E Ä × ABS �¢ 1 - Ä �¢ d �¢ Ä in the Formula (1), E (Ä) is a residence time distribution function determined by impulse response by starch syrup having a viscosity of 3 Pa€¢s, and Ä is ratio of elapsed time ¸ and mean residence time ¸ 0 .