废聚乳酸醇解法制备乳酸烷基酯

PDF全文下载：2016040371

刘会晴,刘福胜*,宋修艳

(青岛科技大学 化工学院，山东 青岛266042)

 摘要：以氯化铁（FeCl3）为催化剂，聚乳酸（PLA）为原料，通过醇解反应制备乳酸烷基酯。采用正交试验考察了反应条件对甲醇醇解PLA结果的影响，得到的较佳反应条件为温度130℃、时间4 h、n(FeCl3)∶n(PLA)=0.01∶1、n(甲醇)∶n(PLA)=5∶1。在上述反应条件下，PLA转化率≥95%，乳酸甲酯收率≥87%。将甲醇换作乙醇、正丙醇、异丙醇或正丁醇，也得到了较好的反应结果。另外，对催化剂的回用性能进行了考察，结果表明:重复回用6次后，PLA的转化率及甲酯的收率无明显变化。采用FT-IR技术对醇解产物进行了表征。

关键词： 聚乳酸； 氯化铁； 醇解； 乳酸烷基酯

中图分类号：TQ 413文献标志码：A

 Preparation of Alkyl Lactates by Alcoholysis of Waste Poly(L-lactic acid)

 LIU Huiqing,  LIU Fusheng, SONG Xiuyan

(College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China)

Abstract: In this paper, alkyl lactates were synthesized from poly(Llactic acid) (PLA) with ferric chloride (FeCl3) as catalyst. By the orthogonal experimental method, the effects of the various reaction conditions on the methanolysis of PLA were observed, and the obtained optimum reaction conditions were reaction temperature 130 ℃, reaction time 4 h, n(ferric chloride):n(PLA)=001:1, n(methanol):n(PLA)=5:1. Under above conditions, the conversion of PLA and yield of methyl lactate were greater than or equal to 95% and greater than or equal to 87%, respectively. Furthermore, a good reaction result was obtained when the methanol was replaced by ethanol, n-pro-panol, isopropanol or butanol. Otherwise,the reusability of the catalyst in the methanolysis was investigated, and the results showed that it could be reused up to 6 times without an apparent decrease in the conversion of PLA and yield of methyl lactate under the given conditions. The structures of the obtained products were characterized by FT-IR.

Key words: poly(L-lactic acid); ferric chloride; alcoholysis; alkyl lactates

收稿日期：20150115

基金项目： 国家自然科学基金项目（21176130）；教育部博士点基金项目(20133719110004)；山东省高等学校科技计划项目(J14LC12).

作者简介： 刘会晴（1986—），女，硕士研究生.*通信联系人.

文章编号：16726987（2016）04037105； DOI： 10.16351/j.16726987.2016.04.004