L2 - CHEE 3462 Lecture 2 Overview Stage Operations...

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CHEE 3462 Lecture 2 Overview Stage Operations Nomenclature Material Balance Equations Operating Line
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Stage Operations Example: 3-Stage Countercurrent Leaching 3 Fresh Solvent 2 1 Fresh Solid Extracted Solid Conc. Solution (solvent + solute) Many stages, multistage, or cascade. Streams move countercurrent. In each stage: 2 partially immiscible streams enter, allowed to mix and separate ; mass transfer between the 2 phases, 2 streams are produced. The outgoing streams tend toward equilibrium. Ideal Stage: outgoing streams are in equilibrium with each other. Real Stage: correction factor or efficiency to account for departure from equilibrium.
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Schematics for Stage Processes Fresh Solid LV Solvent + Solute 1 2 Countercurrent 3 n Extracted Solid Fresh Solvent 1 2 3 VV V LL Cross-flow Cascade 2 3 1 Co-current Cascade (not very efficient) VV
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Nomenclature for Stage Processes L a = L 0 V 1 = V a Stage # increases in the direction of flow of L-phase: Stage 1: where L-phase comes in.
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This note was uploaded on 04/15/2008 for the course CHEE 3462 taught by Professor Mohanty during the Spring '07 term at University of Houston.

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L2 - CHEE 3462 Lecture 2 Overview Stage Operations...

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