Question: When the feed to a distillation column contains a small amount of impurities that are much more volatile than the desired distillate, it is possible

When the feed to a distillation column contains a small amount of impurities that are much more volatile than the desired distillate, it is possible to separate the volatile impurities from the distillate by removing the distillate as a liquid sidestream from a stage located several stages below the top stage. As shown in Figure, this additional top section of stages is referred to as a pasteurizing section.(a) Determine the number of degrees of freedom for the unit(b) Determine a reasonable set of designvariables Volatile impurities Pasteurizing section Distilate Feed Bottums

Volatile impurities Pasteurizing section Distilate Feed Bottums

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