恒沸混合物的扩散蒸馏分离

Diffusion distillation for azeotropic mixture separation

利用恒沸混合物组分间在空气中扩散系数的差异，使恒沸物在有温差作用下的充有空气膜的两板间作扩散，可使恒沸物的组分获得分离．本文建成了平板式扩散蒸馏装置，用异丙醇－水－空气系统作了试验，获得分离因子，扩散通量与冷热板温度，进料组成，气膜厚度间的关系．并得到分离因子比理论值略低，通量比理论理论值略高．

By using the difference in diffusivity of components of mixture in air,the diffusion distillation experiments for separation of azeotropic mixture was carried out.The isopropanol water air system was tested on a parallel flat plates diffusion distillation cell.The separation factor and diffusion flux were measured by taking the hot and cold plates temperatures,feed composition,and film thickness as variables.The results obtained are fairly described by Stefan Maxwell multi component diffusion equation.