Catalytic Conversion of Carbohydrates to Levulinate Ester over Heteropolyanion‐Based Ionic Liquids,ChemSusChem

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Catalytic Conversion of Carbohydrates to Levulinate Ester over Heteropolyanion‐Based Ionic Liquids
ChemSusChem ( IF 7.5 ) Pub Date : 2016-11-15 , DOI: 10.1002/cssc.201601080
Changhua Song ₁ , Sijie Liu ₁ , Xinwen Peng ₁ , Jinxing Long ₁ , Wenyong Lou ₁ , Xuehui Li ₁

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An efficient one‐pot approach for the production of levulinate ester from renewable carbohydrates is demonstrated over heteropolyanion‐based ionic liquid (IL‐POM) catalysts with alcohols as the promoters and solvents. The relationships between the structure, acidic strength, and solubility of the IL‐POM in methanol and the catalytic performance were studied intensively. A cellulose conversion of 100 % could be achieved with a 71.4 % yield of methyl levulinate over the catalyst [PyPS]₃PW₁₂O₄₀ [PyPS=1‐(3‐sulfopropyl)pyridinium] at 150 °C for 5 h. This high efficiency is ascribed to the reasonably high activity of the ionic liquid (IL) catalyst and reaction coupling with rapid in situ esterification of the generated levulinic acid with the alcohol promoter, which allows the insolubility of cellulose encountered in biomass conversion to be overcome. Furthermore, the present process exhibits high feedstock adaptability for typical carbohydrates and handy catalyst recovery by a simple self‐separation procedure through temperature control.

中文翻译：

杂多阴离子基离子液体催化将碳水化合物催化转化为乙酰丙酸酯

在以醇为促进剂和溶剂的基于杂多阴离子的离子液体（IL-POM）催化剂上，证明了一种有效的一锅法从可再生碳水化合物生产乙酰丙酸酯的方法。深入研究了IL-POM在甲醇中的结构，酸性强度和溶解度与催化性能之间的关系。在催化剂[PyPS] ₃ PW ₁₂ O _40上，乙酰丙酸甲酯的收率为71.4％，可以实现100％的纤维素转化率。[PyPS = 1-（3-磺丙基）吡啶]在150°C下放置5 h。这种高效率归因于离子液体（IL）催化剂的相当高的活性，以及反应生成的乙酰丙酸与醇促进剂的快速原位酯化反应，从而克服了生物质转化过程中纤维素的不溶性。此外，通过简单的通过温度控制的自分离程序，本方法对典型的碳水化合物显示出很高的原料适应性，并方便了催化剂的回收。

更新日期：2016-11-15

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