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生物质化学工程

生物质化学工程 ›› 2007, Vol. 41 ›› Issue (5): 1-4.

• 研究报告 •    下一篇

木糖醇发酵模型液的结晶动力学研究

梅余霞1, 方柏山2   

  1. 1. 华中农业大学 农业微生物国家重点实验室, 湖北 武汉 430070;2. 华侨大学 工业生物技术福建省高校重点实验室, 福建 泉州 362021
  • 收稿日期:2007-01-31 修回日期:1900-01-01 出版日期:2007-09-30 发布日期:2007-09-30
  • 通讯作者: 方柏山(1957- ),男,福建莆田人,教授,博士生导师,博士,主要研究方向:生物过程工程。

Crystallization Kinetics of Xylitol Based on the Broth Model

MEI Yu-xia1, FANG Bai-shan2   

  1. 1. Huazhong Agricultural University, State Key Laboratory of Agricultural Microbiology, Wuhan 430070, China;2. Huaqiao University, Province Key Laboratory of Industrial Biotechnology, Quanzhou 362021, China
  • Received:2007-01-31 Revised:1900-01-01 Online:2007-09-30 Published:2007-09-30

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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。

关键词: 木糖醇, 发酵模型液, 结晶, 动力学

Abstract: 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 restricted 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.

Key words: xylitol, broth model, crystallization, kinetics

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