MODELING OF ETHANOL DEHYDRATION BY DIFFUSION DISTILLATION IN CONSIDERATION OF THE SENSIBLE HEAT-TRANSFER

The diffusion distillation is the evaporation and diffusion process be low the boiling temperature of the mixture in a gap filled with the in ert gas. It can separate the azeotropic mixture of ethanol and water. The mass transfer in a differential single column can be described by the Maxwell-Stefan equations. Differential mass balances which can ext end a column model from a differential single column to an integral co lumn and heat balances were suggested. The new model considers the sen sible heat transfers and develops algorithm which enables to calculate interfacial temperature more precisely at condensing liquid film and include one more iterative loop. The results are compared with the exp erimental data and other models.