(195e) Novel Solvent Exchange Distillation Process- a Comparison Study with Batch Systems
AIChE Spring Meeting and Global Congress on Process Safety
2017
2017 Spring Meeting and 13th Global Congress on Process Safety
Kister Distillation Symposium
Kister Distillation Symposium 2017: New Developments in Distillation Science
Thursday, March 30, 2017 - 10:05am to 10:35am
A novel solvent exchange distillation process for both zeotropic and azeotropic equilibrium, which has been developed for replacement of one solvent with a second solvent while keeping the concentration of dissolved nonvolatile solute constant, is described. Detailed simulations for methanol or ethanol replaced by water show that solvent to feed ratios near 1.0 are often sufficient. Comparison of the results with detailed batch distillation simulations show that the novel solvent exchange method gives the same purity with lower solvent and energy consumption. When the less volatile solvent has to be replaced with a more volatile solvent, batch distillation, which requires very large amounts of added solvent and of energy, would normally not be used. Thus, the new solvent exchange distillation process represents a totally new approach to this exchange problem.