摘要
采用磷钨酸-氧化锌为催化剂,将D,L-乳酸先缩聚后解聚制备了D,L-丙交酯。研究表明:在以催化剂质量分数为乳酸的1.2%,磷钨酸(H3PW12O14)与ZnO质量比2/3,真空度为2.0 kPa,缩聚时间为2.5 h,缩聚温度为140℃,解聚温度为230℃的条件下,用乙酸乙酯重结晶之后,可获得的D,L-丙交酯产率为25.0%。在同等条件下,加入10 mL乙二醇作为稀释剂,用乙酸乙酯重结晶之后可获得的D,L-丙交酯产率为29.4%。
In order to obtain proper reaction conditions of lactid synthesis, H3PW12014 -ZnO was adopted to catalyze the reaction of D,L - lactic generation from D,L - lactide. The results showed that 25.0% yield of D,L - lactide was obtained after recrystallization with ethyl acetate under the following conditions ： catalyst quantity 1.2% （ H3PWI2OlJZnO = 2 ： 3 ）, dehydration pressure 2.0 kPa, dehydration-polymerization at 140℃ and pyrolysis-poly- merization at 230℃. While adding 10 mL ethylene glycol as a diluent,29.4% yield of D, L -lactide was obtained after recrystallization with ethyl acetate under the same conditions.
出处
《南昌大学学报（工科版）》
CAS
2012年第2期127-130,共4页
Journal of Nanchang University(Engineering & Technology)
基金
江西省科技厅科技支撑计划资助项目(2007ZD01900)
江西省教育厅科技计划资助项目(GJJ09039)
