Abstract: Currently spray drying process and freeze-drying process are widely used in oligosaccharide drying process. However, there exists several weaknesses in temperature, cost, and material handing capacity. To solve these problems, single-step drying in agitated thin-film evaporator was put forward to find a new way of oligosaccharides drying. The relationship between temperature, pressure, feed rate and evaporation rate per unit area was investigated, and response surface methodology (RSM) was used to fit the data. A model which was in good agreement with the experimental data was obtained. The model determined that under the condition of 70.0℃, 1.0kPa and 0.50L/h the equipment could reach the maximum capacity. Finally, 2.1% moisture content was obtained. The process route and prediction method were feasible. Meanwhile, it provided a new method to treat this kind of material.

Key words: thin-film evaporation, oligosaccharides, drying process

摘要： 目前低聚糖的干燥技术主要有喷雾干燥以及冷冻干燥,存在操作温度过高、成本较高、不能处理大批量物料等缺点。为了解决这些问题,本文提出了以刮膜式薄膜蒸发器对低聚糖提取液进行单步干燥操作。实验分析了设备的处理性能,并利用响应面法拟合得到了温度、压强、进料速度与单位面积蒸发速率之间关系的数据模型。模型可以很好地符合实际结果。在温度、压强、进料速度分别设定为70.0℃、1.0kPa、0.50L/h的条件下,最终得到的产物含水率为2.1%。这表明,工艺路线以及预测方法是可行的,工艺保证了物料较好的流动性,达到了较高的分离效率,得到了质量较高的最终产品。

关键词: 薄膜蒸发, 低聚糖, 干燥工艺