关键词: 薄膜蒸发, 低聚糖, 干燥工艺

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