摘要
本研究基于发酵法生产木糖醇的特点配制木糖醇发酵模型液,研究了杂质、温度、过饱和度、晶种投入量及晶种规格等因素对木糖醇结晶过程中晶体生长速率的影响。实验表明,木糖醇晶体生长速率与温度及过饱和度成正比关系。山梨醇、阿东糖醇等共存杂质都会阻碍木糖醇的结晶。而晶种投入量及晶种规格对木糖醇晶体生长速率的影响很小,可忽略不计。根据公式及Arrhenius方程,建立木糖醇晶体生长动力学方程,计算晶体生长活化能的大小,并对木糖醇晶体生长限速机制进行了分析。在木糖醇晶体生长的不同阶段,速率控制机制与表面融合机制都起到了控制结晶的作用。
According to xylitol fermentation, the broth mfodel of xylitol was prepared. The effects of impurities, temperature, supersaturation, crystal seed amount and size on xylitol crystal growth rate were discussed. It was indicated that xylitol crystal growth rate was proportional to temperature and supersaturation. However, impurities such as sorbitol and adonitol restricled xylitol crystal growth rate, and crystal seed size and amount had no effect on it. The kinetics equation of xylitol crystal growth was established on power-law-equation and Arrhenius-type equation. By the way, the values of activation energy for xylitol crystal growth were calculated. It seemed to indicate that surface integration and speed control might be both significant mechanism in the process of xylitol crystal growth.
出处
《生物质化学工程》
CAS
2007年第5期1-4,共4页
Biomass Chemical Engineering
基金
福建省自然科学重点项目基金资助(C96068)
关键词
木糖醇
发酵模型液
结晶
动力学
xylitol
broth model
crystallization
kinetics
