Stripping section the down flowing liquid is stripped of the more volatile

Stripping section the down flowing liquid is stripped

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Stripping section - the down-flowing liquid is stripped of the more volatile component by the rising vapour. Feed - The liquid and/or gas feed into the distillation column. Overhead condenser - a heat exchange equipment for condensing the hot vapour leaving the top of the distillation column. Reboiler - to produce the vapour stream in Introduction
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Distillation with Trays/Plates Trays/ Plates Distillation Column
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Counter-current contact between liquid and vapour Distillation Column Sieve-tray
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Counter-current contact between liquid and vapour Distillation Column Bubble-cap tray
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Material-Balance for Binary Systems Rectification Section Stripping Section
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Upper Operating Line Rectification Section Upper Operating Line Material Balance for Binary Systems
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1 mole of a two- component mixture x F = mole fraction of the more volatile component, A If the feed is a mixture of liquid and vapour, q is the fraction that is liquid. q - line Material Balance for Binary Systems
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q > 1 (sub-cooled liquid feed) q = 1 (saturated liquid feed ) 0 < q < 1 (partial vapour feed) q = 0 (saturated vapour) q < 0 (superheated vapour feed) Material Balance for Binary Systems
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Stripping Section Lower Operating Line Material Balance for Binary Systems
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Upper Operating Line q - Line Lower Operating Line McCabe-Thiele’s Graphical Method Determination of Number of Trays/Plates
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Slope Slope McCabe-Thiele’s Graphical Method Determination of Number of Trays/Plates
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McCabe-Thiele’s Graphical Method Determination of Number of Trays/Plates
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Counted as one tray/plate McCabe-Thiele’s Graphical Method Determination of Number of Trays/Plates Hold a vapour phase and liquid phase at equilibrium with each other No vapour- liquid separation
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Minimum Reflux Ratio (R min ) the lowest value of reflux at which separation can be achieved even with an infinite number of plates. It is possible to achieve a separation at any reflux ratio above the minimum reflux ratio . McCabe-Thiele’s Graphical Method Determination of Minimum Reflux Ratio
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A benzene-toluene mixture containing 42 mol % benzene is to be separated in multiple steps. In the first step, a distillation column with a partial reboiler and a partial condenser is to be used to separate the flow into one holding of 70 mol % benzene and another holding of 10 mol % benzene: i. Estimate the number of trays/plates needed in the distillation column if the feed consists of 75% saturated vapour and 25% saturated liquid, the reflux ratio is 1.5 and the overall tray/plate efficiency is 40%. ii. Determine the minimum reflux ratio. iii. Determine the optimum feed location. Example – Number of Trays/Stages
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