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4460 Lab Lecture 3 2011 - Dr.MarioRichardEden...

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CHEN 4460 – Process Synthesis,  Simulation and Optimization Dr. Mario Richard Eden Department of Chemical Engineering Auburn University Lab Lecture No. 3 – Sequencing of Azeotropic Distillation Columns October 4, 2011 Contains Material Developed by Dr. Daniel R. Lewin, Technion, Israel   Azeotropic Distillation
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Introduction When  two  or  more  components  differ  in  boiling  by  less  than  approximately  50 ° C  and  form  a  nonideal  liquid  solution , the relative volatility may be below 1.10. Then  ordinary  distillation  may  be  uneconomic,  and  if  an  azeotrope forms even impossible. In that event, the following separation techniques, referred  as  enhanced  distillation  by  Stichlmair,  Fair,  and  Bravo,  should be explored: Extractive distillation Salt distillation Pressure-swing distillation Homogeneous azeotropic distillation Heterogeneous azeotropic distillation Reactive distillation
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Example 1 Given  that  methyl  acetate  ( 1 ),  which  boils  at  57.8 ° C,  methanol  ( 2 ),  which  boils  at    64.7 ° C  and  n-hexane  ( 3 ),  which boils at 68.7 ° C.  A. Sketch  any  boundaries  across  which  the  residue  curves  cannot traverse. B. Sketch the residue curves for three feed compositions: Mole Fractions Component I II III 1 0.70 0.15 0.15 2 0.15 0.70 0.15 3 0.15 0.15 0.7
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Example 1 Note  the  existence  of  four  azeotropes where 
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