Design Flowsheet via Extractive Distillation

The product specifications are set to be exactly the same as in Chien et al. and in Arifin and Chien. They are 99.9999 mol%ofIPA inDl and 99.9 mol% of water in D2. The reason for the ultra-high purity in IPA is for semiconductor industry usage. The feed composition is typical of a waste IPA stream in the semiconductor industry and contains equal molar 

There are many design variables to be determined, so to simphfy the optimization the more important and complex extractive distillation column is optimized first. We considered three different cases for the entrainer feed temperature. 

Case 1 Operating the entrainer feed temperature 5 - 15°C below the top temperature of the extractive distillation column (as suggested in Knight and Doherty ). We use 72°C in the following simulation. 

Case 2 Operating the entrainer feed temperature the same as temperature in the B2 stream (196.6°C) with no cooler. 

Case 3 Subcooling the entrainer feed temperature (from B2) to 40°C. 

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Figure 10.14 Optimal design flowsheet via extractive distillation.

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