Reflux Ratio, Higher Is The Purity Of The Distillate And Bottom Stream

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reflux ratio, higher is the purity of the distillate and bottom stream [4], [19]. Depending on the bubble point of the vapor at the top of the column and the economics of the process, the distillation column may be equipped with a total condenser or a partial condenser [20]–[22]. A total condenser condenses the entire vapor at the top of the column into liquid which is then split into distillate stream and reflux stream. If a column has a total condenser then there would be no ‘vapor distillate’ stream in Figure 1.2. A partial condenser condenses part of the vapor at the top of the column. The remaining vapor exits the column as vapor distillate. Part of the condensed liquid stream is refluxed as before and the rest is taken out as liquid…show more content…
One other process intensification method that is relevant to this study is the reactive distillation and will be discussed in the following section. Reactive distillation Reactive distillation (RD) is an extension to conventional distillation process wherein operating conditions are maintained to facilitate reaction inside the distillation column. Figure shows a schematic of reactive distillation column. Part of the column packing or trays may be supplemented with catalyst in order to create a reaction zone. The reaction zone may be located at any location of the column depending on the reactions desired. Figure 1.3: Schematic of a reactive distillation column Reactive distillation has received a lot of attention as part of process intensification efforts in the last few decades [31]–[36]. Reactive distillation columns can be utilized to selectively react components of a mixture where the reaction may not be selective by nature [37]. Reactive distillation has thus often been used to replace multiple units where a distillation column would be used for separation and a reactor used for the reaction part. Harmsen [37] has reviewed commercial applications of reactive distillation. Reactive distillation systems have been shown to reduce variable cost, capital expenditure and energy requirements by 20% or more for some processes [37]. Also, since the heat of reaction is used for evaporation in a column, increased reaction rates can results in increased

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