L12 - Lecture 12(L-L Extractors cont.) Perforated Plate...

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Lecture 12 (L-L Extractors cont.) • Perforated Plate Towers - Like sieve towers • Baffle Towers
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•Agitated Tower Extractors - Mixing is done by the central rotor. •Pulse Column - Flow rate is varied/pulse with time.
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• Centrifugal Extractor -Makes use of centrifugal force (heavier phase moves to outside lighter phase moves to inside) Heavier Heavier Lighter Lighter
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• Phase Equilibria -at least 3 components -at least 2 Φ Ex. 1 2 2 Φ 1 Φ - abcde is the 2 Φ region - outside is the 1 Φ region A (solvent) MIK: Methyl Isobutyl Ketone B (diluent) Water C (solute) Acetone Critical or plait point F(L a ) Raffinate c d ab Extract V b L b V a e
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Ex. 2 Methyl Cyclohexane (Solute) 2 region intersects the solute- solvent line (no plait point) Extract phase Raffinate phase Aniline (Solvent) Heptane (Diluent) • Tieline CD: Solute concentration at “c” > solute concentration at “d” desirable phase behavior True for Example 1 Not true for Example 2
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•Extract phase: rich in solvent •Raffinate phase: rich in diluent Solvent V b Raffinate L b Extract V a Feed L a
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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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L12 - Lecture 12(L-L Extractors cont.) Perforated Plate...

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