响应面法优化硫酸铬催化木糖水解制备糠醛的研究

Optimization of chromium sulfate catalytic hydrolysis of xylose into furfural based on response surface methodology

以木糖为原料,硫酸铬为催化剂,甲苯/水为双相反应体系,在单因素试验的基础上,采用中心组合试验设计考察了反应温度、反应时间、催化剂用量、木糖浓度对糠醛产率的影响。响应面分析结果表明:反应温度、反应时间、催化剂用量及木糖浓度对糠醛产率有显著影响,且显著性大小顺序依次为:反应温度≈反应时间>木糖浓度>催化剂用量。当反应温度为150℃,反应时间为118min,木糖浓度为0.5mol·L-1,催化剂用量为0.1mol·L-1时,糠醛产率有最大值,为44.25%。最佳条件下得到的实验结果与二次回归模型预测值相一致。

On the basis of single factor experiments,the reaction conditions of furfural production from xylose using chromium sulfate as catalyst in biphasic system was studied by response surface methodology（RSM）. A central composite design（CCD）was used to determine the effects of independent variables,including reaction temperature,reaction time,catalyst loading and xylose concentra-tion on furfural yield. The surface response analysis revealed that all the variables selected in this study had a strong influence on the furfural yield,and the order of signficance was reaction temperature≈reaction time〉xylose concentration〉catalyst loading. The maximum furfural yield of 44. 25%was achieved at a reaction temperature of 150℃ for 118min,xylose concentration of 0. 5mol· L-1 ,catalyst loading of 0. 1mol·L-1 . The quadratic regression model was consistent with the experimental data under the optimum condition and the model was reliable.