鼓泡超滤法用于木糖生产过程的探讨

Application of Gas Sparging to the Production Process of Xylose by Ultrafiltration

目前工业中以玉米芯为原料,经过水解、中和、二次脱色和二次离子树脂交换等步骤,制取木糖,但操作复杂,成本较高。本试验将膜超滤技术引入到木糖生产工艺中,研究了压力、流量和温度等因素对超滤的影响,超滤能很好地截留杂质,提高木糖纯度。浓差极化和膜污染是超滤过程中最常见的两个主要障碍,使用鼓泡法来改善浓差极化和膜污染对膜性能的影响。大量试验表明,超滤能代替一次脱色处理并能优化其它工艺操作,可应用于木糖生产。

In the current industry, the xylose is manufactured by corncobs through hydrolysis, neutralization, twice decoloring with activated carbon, twice ion-exchange treatments and some other steps. But the process is costly and complex. In this paper, ultrafiltration was introduced into the production process of xylose. The effect on ultrafihration treatment was analyzed, such as trans-membrane pressure, fluid flux, and temperature. The result showed the ultrafiltration treatment can cut down impurity and purify the xylose solution. In the ultrafihration, gas sparging was used to deal with the tricky problems such as concentration polarization and membrane fouling. Lots of tests proved ultrafiltration can replace one decoloring with activated carbon, simplify the process, and can be applied to the production of xylose.