Plastics lactic acid and polylactic acid method

SHIMADZU CORP, OHARA H, TOYOTA JIDOSHA KK, ITO M and SAWA S 2002 年 8 月 8 Publication Date Patent WO 2002 60891-A, reported for the production of biodegradable plastics, and Lactic acid  preparation method of the patent One embodiment of the method reported as follows: fermentation of L-ammonium lactate and ethanol at 90-100 ℃ the reaction, separation, collection of alcohol; 120 ℃ the removal reaction of the water; obtained was purified by distillation of ethyl lactate In dioctyltin 160 ℃ magnessium lactate in the presence of ethyl lactate and ethanol off. The resulting reaction solution was distilled at 200 ℃ acid obtained in a yield of 99.2%. In the polymerization in the presence of lactic acid dioctyltin of lactic acid. NATL INST OF ADVANCED INDUSTRIAL SCIENCE TECHNOLOGY METI, KONAN KAKO KK and TOKIWA YUTAKA2001 August 21, disclosed in Japanese Patent JP 2001 224392, reported the use of enzymes instead of the organic metal catalyst polylactic acid.