L14 - Lecture 14 Liquid-Liquid Extraction 3/12/02 Liquid -...

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3/12/02 Liquid - Liquid Extraction continued 1 Lecture 14 Liquid-Liquid Extraction
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2 Continuous Countercurrent Multistage Extraction • Overall Material Balance: ¾ L a + V b = L b + V a = M • Overall Composition Balance: ¾ L a x a + V b y b = L b x b + V a y a = MX m N n 2 1 v b y b v a y a Extract v 2 y 2 Solvent Raffinate L a x a Feed L 1 x 1 L b x b
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3 Continuous Countercurrent Multistage Extraction x M = L a x a + V b y b L a + V b ¾ M, L a , V b lie on a straight line L b x b + V a y a L b + V a ¾ M, L b , V a lie on a straight line Solute (A) Solvent (S) . . La Lb . . Ln M Vn+1 Va Vb . . . (∆, x ) A: 0.1 D:1.5 S:-0.6 (40,40,20) Lever Rule- gives the relative amounts of the streams Ln x M = Diluent (D)
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4 L a –V a = L b –V b = = Net Flow to the Left L a x a –V a y a = L b x b –V b y b = X = Net Flow of a component to Left X = L b –V b L b x b –V b y b ¾ L b ,V b , Lie on a straight line X = L a x a –V a y a L a –V a ¾ L a ,V
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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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L14 - Lecture 14 Liquid-Liquid Extraction 3/12/02 Liquid -...

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