Lecture Notes 13 Part 2

Lecture Notes 13 Part 2 - Continuous Extraction- RQ P4

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8/9/11 Continuous Extraction- RQ When designing an extraction system, it is desirable: To have laminar flow such that no mixing of the two phases occurs. This makes for  an efficient separation of the two phases and isolation of the target product. Turbulent flow allowing for the formation of emulsions. The close proximity of the two    phases will ensure the greatest amount of solute transfer from one phase to another. A small number of stages (low HETS) to ensure mixing of phases, but not to the  A. B. C.
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8/9/11 Staged Extraction Modeling Several Key Assumptions: 1. Solvents are immiscible. 2. Equilibrium is attained. 3. Constant flow rate.
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8/9/11 Staged Extraction Analytical H, x2 L H,  xn-1 n H, xn L, yn L, yn-1 L, y1 H,  x3 1 2 n-1 L,   yn-2 L,  y2 H, xn+1 H, x1 Two Key Relationships: K = y n x n 1. Equilibrium Expression (Partition  Coefficient):  2. Material Balance
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8/9/11
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Lecture Notes 13 Part 2 - Continuous Extraction- RQ P4

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