绿竹蒸汽处理过程中戊聚糖溶出的新模型

A novel model for process of pentosan digestion during steam treatment of green bamboo

在一定条件范围内对绿竹进行蒸汽处理,基于理论动力学模型获得的参数,建立其在该过程中戊聚糖溶出的新模型。结果表明,基于传统剧烈因子衍生的戊聚糖溶出预测模型并不适用。通过等温阶段戊聚糖移除动力学的研究,求得其溶出活化能和指前因子分别为48.1kJ.mol-1和4330min-1;将此活化能和'潜在移除度'引入戊聚糖移除率预测模型,同时采用数值算法累积计算升温阶段修正的剧烈因子,最终发现该修正模型可准确预测蒸汽升温和保温处理过程中绿竹戊聚糖的移除率(预测值和实验值之间相关系数的平方达97%)。该模型的建立对绿竹蒸汽处理过程中戊聚糖溶出率的预测和控制以及间接阐明该预处理方法对后续酶水解效率产生影响等方面具有一定的指导意义。

Green bamboo was hydrolyzed in a range of certain condition by steam treatment.Based on the parameters obtained in theoretical kinetic model,a novel model was developed for prediction of pentosan leaching out during steam treatment of green bamboo.Firstly,it should be pointed out that the traditional model based on derivation of severity factor was not successful for prediction of the pentosan leaching out.So,the development of a novel model is necessary.Based on the experimental data of pentosan digestion at isothermal pseudo-homogeneous process,the activation energy and frequency factor for irreversible first order kinetics was calculated as 48.1 kJ·mol-1 and 4330 min^-1 respectively.After introducing ＂potential hydrolysis degree（hd）＂ into the novel prediction model,numerical algorithm was used for calculation of severity factor in non-isothermal process.The model containing the severity factor was effective for prediction of pentosan leaching out during whole treatment process of green bamboo by steam.The agreement between model predicted and experimental data is good,and the correlation coefficient is 97%.This model could be used for control of pentosan digestion from green bamboo with steam treatment and for clarifying the effect of pretreatment on subsequent enzymatic hydrolysis.