| 磷钨酸-氧化锌催化合成D,L-丙交酯 |
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| 引用本文： | 龚明,罗卫东,刘文明.磷钨酸-氧化锌催化合成D,L-丙交酯[J].南昌大学学报(工科版),2012,34(2):127-130. |
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| 作者姓名： | 龚明 罗卫东 刘文明 |
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| 作者单位： | 1. 南昌大学应用化学研究所,江西南昌,330031
2. 江西省高安二中,江西高安,330800 |
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| 基金项目： | 江西省科技厅科技支撑计划资助项目，江西省教育厅科技计划资助项目 |
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| 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%。
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| 关 键 词： | D L-乳酸 D L-丙交酯 杂多酸 氧化锌 |
Synthesis of D, L - Lactide over H3 PW12 O14 - ZnO Catalyst |
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| GONG Ming
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LUO Wei-dong
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LIU Wen-ming.Synthesis of D, L - Lactide over H3 PW12 O14 - ZnO Catalyst[J].Journal of Nanchang University(Engineering & Technology Edition),2012,34(2):127-130. |
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| Authors: | GONG Ming LUO Wei-dong LIU Wen-ming |
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| Affiliation: | ( I. Institute of Applied Chemistry, Nanchang University, Nanchang 330031, China; 2. Gao＇ an No. 2 Middle School, Gao＇ an 330800, China) |
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| Abstract: | 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. |
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| Keywords: | D L - lactide D L - lactic heteropolyacid ZnO |
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