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Highly efficient metal salt catalyst for the esterification of biomass derived levulinic acid under microwave irradiation

机译：高效的金属盐催化剂，用于微波辐射下的生物质衍生的乙酰丙酸的酯化

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摘要

The esterification of levulinic acid ( LA) to alkyl levulinates has been investigated in the presence of various metal salt catalysts under microwave irradiation. The reaction obtained 99.4% yield of methyl levulinate (ML) in the presence of Al-2(SO4)(3) catalyst in methanol solution under microwave conditions. The optimized reaction conditions were 110 degrees C and 10 minutes with a 20 mol% catalyst loading. Alcohols with longer carbon chains showed lower reactivities in the microwave electromagnetic field due to their poorer abilities to absorb and transmit microwave energy. Moreover, microwave irradiation provided a significantly higher reaction rate compared to conventional oil bath heating. LA aqueous solution was also converted to ML with high yields. The Al-2(SO4)(3) catalyst was successfully applied to the esterification of other biomass derived organic acids to their corresponding esters in high yields. Finally, the catalyst was recycled 5 times without much decrease in activity.
机译：已经在微波辐射下的各种金属盐催化剂存在下研究了乙酰丙酸（LA）与烷基乙酸含量的酯化。在微波条件下，在甲醇溶液中的Al-2（SO4）（3）催化剂存在下，在甲醇溶液存在下，在甲醇溶液的存在下得到的反应得到99.4％。优化的反应条件为110℃，10分钟，催化剂负载20mol％。由于其吸收和传递微波能量的能力较差，具有较长的碳链的醇在微波电磁场中显示出较低的反垃圾植物。此外，与常规的油浴加热相比，微波辐射提供了更高的反应速率。 La水溶液也以高产率转化为mL。成功地将Al-2（SO 4）（3）催化剂以高产率成功地应用于其它生物质衍生的有机酸的酯化。最后，催化剂再循环5次，无需减少活性。

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  • 来源
    《RSC Advances》 |2016年第3期|共6页
  • 作者

    Huang Yao-Bing; Yang Tao; Cai Bo; Chang Xin; Pan Hui;

  • 作者单位

    Nanjing Forestry Univ Coll Chem Engn Nanjing 210037 Jiangsu Peoples R China;

    Nanjing Forestry Univ Coll Chem Engn Nanjing 210037 Jiangsu Peoples R China;

    Nanjing Forestry Univ Coll Chem Engn Nanjing 210037 Jiangsu Peoples R China;

    Nanjing Forestry Univ Coll Chem Engn Nanjing 210037 Jiangsu Peoples R China;

    Nanjing Forestry Univ Coll Chem Engn Nanjing 210037 Jiangsu Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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