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Methanol-Water Batch Distillation Prepared by: Jason Hixson Don Scott Michael Hickey December 2, 2005 UTC ENCH 435
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Objective Equipment Heat Loss Flooding Reboiler and Reflux composition VLE Data for the column trays Materials Balance Conclusions Outline:
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Objective Observe and analyze performance of batch distillation.
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Equipment
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Analysis Calculation of the overall heat transfer coefficient, U, was done using the following equation. T R(0) =Reboiler Temp at time=0 T A = Ambient Temperature T R =Reboiler Temp at time=t Using this equation as a model we were able to fit U to best fit our data range. Reboiler T R, m, Cp TATA A Column
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Heat Loss without Heat Input 102 W 120 W 121 W 102 W156 W 151 W 156 W 300 W Heat Loss with Pure Methanol Heat Loss with Pure Water 52 W95 W Water QL=858 W Methanol QL=497 W
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Condenser Equations: Q=m*Cp*ΔT Q=UA ΔT LM Estimated A= 1325 cm 2 x the % of Condenser used Water:Methanol: Q=1.13 kWQ=0.88 kW Water, T 2 Water, T 1 VaporLiquid Enters and Exits at T 3
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Flooding
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Liquid,x Vapor, y VLE Diagram
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Reboiler Composition vs. Time 0% Reflux: 3200 W 75% Reflux: 2500 W Initial x m : 23%Initial V m : 16.86 L 75% Reflux 0% Reflux
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Reflux Composition vs. Time Collected 1.9 L/hr at 75% Reflux Collected 6.1 L/hr at 0% Reflux 0% Reflux 75% Reflux
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VLE Diagrams VLE Data for Column Trays: Methanol-Water VLE 75% Reflux
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VLE Diagrams Continued VLE Data: Methanol-Water VLE 75% Reflux
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Material Balance Reboiler M, x A Distillate M F, x A x AI *M=x AF *M 75% Reflux x AI =23 mol % MeOH x AF =98 mol % MeOH M F =6.3 g MeOH/min 0% Reflux x AI =23 mol % MeOH x AF =30 mol % MeOH M F =101.5 g MeOH/min
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Conclusions At 75% reflux the purity of methane was at much higher quality. If quality is more important then a high reflux percentage is needed. If quantity and timeliness is more important then a low reflux is needed.
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