Study on Catalytic Preparation of Diosgenin by Sulfonic Acid-Functionalized Ionic Liquid
Objective:To explore the application of the sulfonic acid-functionalized ionic liquid[BHSO3MIm]CF3SO3 as a catalyst in the preparation of diosgenin.Methods:Crude saponins extracted from Dioscorea zingiberensis were used as raw materials.With[BHSO3MIm]CF3SO3 as a catalyst,diosgenin was prepared by hydrolysis.The reaction temperature,reaction time,amount of ionic liquid,and volume of solvent were investigated by single factor test.The reaction conditions were further optimized by response surface analysis to determine the optimal reaction conditions.The recycling performance of the ionic liquid was investigated by 12 cycles of experiments.Results:The optimal reaction condition was as follows:reaction temperature at 100 °C,reaction time of 5.17 h,ionic liquid amount of 2.56 g,and solvent of 6 mL.Under these condition,the yield of diosgenin was 12.99%.When the ionic liquid was tested six times,the cycling efficiency was still as high as 82.70%and decreased to 58.12%when the ionic liquid was tested 10 times.Conclusion:In the preparation process of diosgenin,[BHSO3MIm]CF3SO3,as an acid catalyst,has the advantages of high hydrolysis efficiency,stable performance,easy recovery,and good recycling performance,and it has a strong application prospect.
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