| 引用本文: | 李媛,王鹏,曹海雷.微波辅助酸化蒙脱土催化合成乳酸正丁酯的研究[J].材料科学与工艺,2012,20(1):49-52,57.DOI:10.11951/j.issn.1005-0299.20120110. |
| LI Yuan,WANG Peng,CAO Hai-lei.Microwave assisted synthesis of n-butyl lactate catalyzed by acid-activatedmont morillonite clay[J].Materials Science and Technology,2012,20(1):49-52,57.DOI:10.11951/j.issn.1005-0299.20120110. |
|
| 摘要: |
| 采用微波辐照法对钠基蒙脱土进行了酸化改性，制备出了酸化蒙脱土（H-MMT）固体酸催化剂，并利用X射线衍射、低温物理吸附等技术对催化剂性质进行了表征，结果表明，经微波辐照酸改性的催化剂层状结构没有被破坏，层间距略有下降，结晶度降低；比表面积和孔径都增大，形成了较好的介孔结构；表面酸量增加.这些特性使得催化剂表现出良好的催化活性.而后，以H-MMT为催化剂，系统研究了乳酸正丁酯的微波辅助合成方法，考查了催化剂用量、微波功率以及微波辐照时间对酯化率的影响.结果表明，微波功率200W、辐照15min、催化剂用量6.0%（占乳酸和正丁醇总质量）为最优的酯化条件，在此条件下，酯化率可达72.4%.最后，探讨了微波辅助H-MMT催化合成乳酸正丁酯的机制，发现H-MMT与微波具有协同作用.微波辅助H-MMT催化合成乳酸正丁酯是一种高效、节能、环境友好的方法，具有市场推广前景. |
| 关键词: 微波辅助 蒙脱土 固体酸催化剂 乳酸正丁酯 |
| DOI：10.11951/j.issn.1005-0299.20120110 |
| 分类号:O623.624 |
| 基金项目:国家自然科学基金资助项目(50678045,50821002) |
|
| Microwave assisted synthesis of n-butyl lactate catalyzed by acid-activatedmont morillonite clay |
|
LI Yuan, WANG Peng, CAO Hai-lei
|
|
Research Center for Green Chemistry and Technology,School of Municipal and Environmental Engineering,Harbin Institute of Technology ,Harbin 150090,China
|
| Abstract: |
| Acidic montmorillonite (H-MMT) was managed to be prepared by treating Na-montmorillonite with H2SO4 under microwave irradiation.The structure and characters of H-MMT were studied by X-ray diffraction(XRD) and nitrogen adsorption/desorption techniques.The results revealed that acid activation did not affect the layer structure,the surface area and pore volume was larger,and the acid amount was increased.Thus,H-MMT exhibits high catalytic activity in the microwave assisted esterification of lactic acid and n-butyl alcohol.After that,the synthesis of n-butyl lactate was performed by the esterification of lactic acid and n-butyl alcohol in the presence of H-MMT as catalyst under microwave irradiation.The synthesis conditions were systematically investigated and the optimum conditions are as follows:the microwave power is 200W,the reaction time is 15min and the catalyst amount is 6.0%.Under the above conditions,the ester yield could reach 72.4%.Compared to conventional heating and sulfuric canalization,microwave and H-MMT have a synergistic effect on the ester yield of n-butyl lactate.Microwave assisted synthesis of n-butyl lactate catalyzed by H-MMT was proved to be high-efficient,economical and eco-friendly. |
| Key words: microwave acid-activated montmorillonite n-butyl lactate |
