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Unformatted text preview: 1 SCHOOL OF CHEMICAL ENGINEERING CEIC3001 Advanced Thermodynamics and Separation Lecture Summary - Week 4 ABSORPTION AND STRIPPING Suggested reading: Sections 6.0 to 6.4 in Seader and Henley 2nd edition CONTENTS 1 Absorption and Stripping 2 2 Countercurrent cascades 2 3 The operating line 3 4 Determining the Number of Equilibrium Stages 4 4.1 Problem Statement 4 4.2 Graphical Solution Method (Absorption) 4 4.3 Determining the Minimum Solvent Flow 5 4.4 Graphical Solution Method (Stripping) 5 HIGHLIGHTS 1. Absorption involves the transfer of one or more components (the solute) from a gas to a liquid solvent. 2. To maximise the mass transfer, countercurrent flow is used. 3. Process can be represented by a cascade of equilibrium stages, the gas and liquid leaving each stage being in equilibrium. 4. If solvent and carrier gas flows are constant, the solute/carrier gas and solute/solvent ratios X and Y in the passing (interstage) streams lie on a straight line (the operating line ) on the X-Y plot. 5. The slope of the operating line is L’/V’ , the ratio of solvent to carrier gas flow. 6. By stepping between the equilibrium curve and the operating curve, the number of stages to achieve a given amount of absorption can be determined. 2 1 Absorption and Stripping absorption involves the transfer of one or more components from a gas phase to a liquid solvent material transferred is the solute the process of removing the solute from the solvent is known as stripping the solvent can be recycled back into the process after stripping absorption is a physical process and involves no change in chemical species...
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- Chemical Engineering, Line segment, equilibrium stages, graphical solution method, Countercurrent cascades