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LABREPORTEXP-2_PHASE_EQB - MIDDLE EAST TECHNICAL UNIVERSITY...

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MIDDLE EAST TECHNICAL UNIVERSITY FACULTY OF ENGINEERING DEPARTMENT OF CHEMICAL ENGINEERING CHE 320 CHEMICAL ENGINEERING LABORATORY - I EXPERIMENT – 4 PHASE EQUILIBRIA IN A TERNARY SYSTEM BY GROUP R11 SUBMITTED TO : PROF. DR. ALİ ÇULFAZ ASST. AYŞE BAYRAKÇEKEN SUBMITTED BY : BİRSU AYDOĞDU (GROUP LEADER) CEREN AYDIN ŞULE SEDA YILMAZ TÜLİN TAŞKIN EXPERIMENT PERFORMED: 05.04.2007 REPORT SUBMITTED: 12.04.2007
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ABSTRACT In this experiment, our objective is to analyse the phase equilibria in a ternary system composed of acetic acid, water and toluene on a Gibbs-Roozeboom Equilateral Triangle. By the help of the data given in literature, five well-spread points are selected in the two-phase region. By treating the mixtures with acetic acid, these two- phase mixtures are transformed into one-phase mixtures. By the new composition of the one-phase mixtures, five experimental points on the binodal curve are obtained and the experimental solubility curve is determined. Due to some experimental errors, the experimental solubility curve deviates from the literature data. Then by selecting three two-phase mixture points under the binodal curve are used for determining the tie-lines and the plait point. By the help of a separatory funnel, the visible two-phases are separated and each phase one being rich in toluene and the other being rich in water are weighed. Titrating these two rich-phases by KOH solution, the corresponding points for each mixture is obtained on the binodal curve. The selected point and the rich phase points are combined in order to determine the tie-lines. After the tie-line determination, by conjugate curve method, plait point is obtained. The plait point is estimated by extrapolation as follows: aceticacid x = 0,53, Water x = 0,04 , Toluene x = 0,43. 2
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TABLE OF CONTENTS 1. INTRODUCTION 4 2 . EXPERIMENTAL METHODS 7 3.RESULTS 9 3.1 Determination Of The Solubility Curve 9 3.2 Determination Of The Tie-Lines 11 3.3. Determination of The Plait Point 13 4.DISCUSSION 14 5.CONCLUSIONS 16 6.REFERENCES 17 7.APPENDICES 18 Appendix A – Sample Calculation 18 Appendix B – Material Safety Data Sheet 20 Appendix C – Data Sheet 27 3
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NOMENCLATURE Symbol Definition SI Units F Degrees of freedom C Number of components P Number of phases V Volume of a specie ml ρ Density of a specie g/ml m Mass of a specie g n Mole of a specie mole M Molarity of a specie M MW Molecular weight of a specie g/mole x Weight fraction of a specie 4
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1.INTRODUCTION In this experiment we dealed with phase equilibria conditions. If the macroscopic properties of a system is not changing with time system is called in an equilibrium. In phase equilibria there is no net mass transfer, or net change in concentrations of the materials in the phases (concentrations are constant).
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