The Influence of Mass Transfer on Energy Efficient Distillation Design Brett Walker and Dr. Ross Taylor Department of Chemical and Biomolecular Engineering Distillation is a process to separate compounds based on differences in boiling points; it is by far the most used separation process. Distillation columns account for approximately seven percent of the total energy consumed in the US. There are large overhead costs associated with building and testing these columns, initial design is therefore done entirely using theoretical models. In standard design procedures the model column is assumed to be operating at equilibrium. That is, the vapor and liquid phases have sufficient time to reach their theoretical maximum separation. In this work we are able to relax the equilibrium assumption and examine how the design changes when mass transfer limitations are considered. Calculations are performed both in the ChemSep software package and independently programmed. We show that mass transfer effects can have significant impacts on the optimum design, particularly in thermodynamically non-ideal systems, situations in which small amounts of a trace compound are desirable and in determining the height of the column. Mass transfer effects can both improve the design effectiveness or decrease it. However, either way the influence is important. In certain cases, neglecting the effects of mass transfer can lead to columns that cannot perform the desired separation. 2012, Chemical Engineering, Honors Program, Dr. Ross Taylor