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Separation Process Engineering: Includes Mass Transfer Analysis, Third Edition by Phillip C. Wankat

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9.3 Constant-Level Batch Distillation

One common application of batch distillation (or evaporation) is to switch solvents in a production process. For example, solvents may need to be exchanged prior to a crystallization or reaction step. Solvent switching can be done in a simple batch system by charging the still pot with feed, concentrating the solution (if necessary) by boiling off most of the original solvent (some solvent needs to remain to maintain agitation, keep the solute in solution, and keep the heat transfer area covered), adding the new solvent and doing a second batch distillation to remove the remainder of the original solvent. If desired the solution can be diluted by adding more of the desired solvent. Although this process ...

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