废纸与葡萄糖的亚临界水解动力学

Sub-critical hydrolytic dynamics of waste paper and glucose

葡萄糖是从生物质资源出发制备乙醇的中间体。为了研究亚临界条件下水解废纸制备葡萄糖工艺的可行性,分别测定了300～320℃,280～310℃范围内废纸和葡萄糖的亚临界水解反应动力学。以匀相动力学模型对废纸中纤维素的水解及葡萄糖的水解数据进行拟合,拟合结果表明,水解速率常数均随温度的升高而增大;纤维素的水解活化能和葡萄糖水解活化能分别为60.16kJ/mol,79.59kJ/mol。研究结果表明:亚临界水中葡萄糖的水解活化能较废纸中纤维素的水解活化能高,故有利于葡萄糖的积累,但葡萄糖的水解速率常数较废纸中纤维素的大,故在实际的工艺运用中严格控制温度和反应时间可获得高产值的葡萄糖。

Glucose is the intermediates starting biomass to prepare ethanol.In order to study the feasibility of hydrolytic waste paper preparing glucose process under sub-critical conditions,sub-critical hydrolytic dynamics of waste paper and glucose in the range of 300~320℃,280~310℃ were determined respectively.Hydrolytic data of hydrolysis and glucose of cellulose in waste paper were fitted by the model of even dynamics.The results show that hydrolytic rate constant is enlarged by the improvement of temperature;hydrolytic energy of activation of cellulose and glucose were 60.16kJ/mol,79.59 kJ/mol respectively.The results also show that hydrolytic energy of activation of glucose in sub-critical water is higher than activation energy of hydrolysis of cellulose in waste paper.So this was advantageous to the accumulation of glucose.But the hydrolysis rate constant of glucose is bigger than that of cellulose in waste paper.High output value of glucose can be obtained by strict control of temperature and reaction time in actual process application.