화학공학소재연구정보센터
Separation Science and Technology, Vol.39, No.1, 1-17, 2004
Increasing the energy efficiency of extractive distillation
New flow sheets are developed for extractive distillation when it is used to break azeotropes. Detailed simulations of the model system, ethanol-water-ethylene glycol, are used to determine the energy use and Column sizes. Replacing the total condenser used for the concentration column of the classical extractive distillation design with a partial condenser and thus connecting to the second column with a vapor instead of a liquid stream can result in reductions of both heating and cooling requirements of over 20%. An additional 9% reduction in heating and cooling requirements can be obtained with a new recycle design for extractive distillation.