Batch azeotropic distillation for aqueous isopropanol separation with energy reduction

Conventional and new modes of batch distillation were studied to reduce energy cost in the separation of aqueous isopropanol.In a binary batch azeotropic distillation process,dynamic accumulative operation reduced 53.5% energy cost than regular constant reflux operation with the same concentration of product,yield of isopropanol,amount and concentration of slop cut.In ternary batch azeotropic distillation process,the operation by two tanks in turns required 63.4% energy cost less than regular constant reflux operation,and 19.1% energy cost less than total reflux operation.By the new operation,the yield of isopropanol was increased from 39.3%(by regular constant reflux operation) and 72.7%(by total reflux operation) to 84.2%.Dynamic accumulative operation was feasible in binary batch azeotropic distillation,and operation by two tanks in turns was feasible in ternary batch azeotropic distillation.