A method for producing polylactic acid, the manufacturing apparatus of polylactic acid, the production method of biodegradable plastics and biodegradable plastics manufacturing equipment

摘要

The present invention can be obtained in uniform quality polylactic acid, a method for producing polylactic acid which can shorten the production period, apparatus for producing polylactic acid, process for producing biodegradable plastics and biodegradable plastics manufacturing apparatus I provide. A primary fermentation tank 12 causes the lactic acid fermentation by sealing the plant-based raw materials. First separation means 13, the fermented product obtained by fermentation in the primary fermentation tank 12, separated into a liquid part and a solid part. Secondary fermentation tank 15, to re-fermented by sealing the liquid part of the separated fermentation product by the first separating unit 13. Second separation means 16, the re-fermented product obtained by re-fermented in secondary fermentation tank 15, is separated into a liquid part and a solid part. Dehumidifying means 17, the water from the liquid part of the separated again fermented product in the second separation means 16 was evaporated to extract the lactic acid. Polymerization means 18, to heat the lactic acid was extracted by dehumidifying means 17, obtaining a polylactic acid 2 by polymerization. [Selection Figure] Figure 1