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Methanol-Water Batch Distillation

Methanol-Water Batch Distillation. Prepared by: Jason Hixson Don Scott Michael Hickey. December 2, 2005 UTC ENCH 435. Outline:. Objective Equipment Heat Loss Flooding Reboiler and Reflux composition VLE Data for the column trays Materials Balance

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Methanol-Water Batch Distillation

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  1. Methanol-Water Batch Distillation Prepared by: Jason Hixson Don Scott Michael Hickey December 2, 2005 UTCENCH 435

  2. Outline: • Objective • Equipment • Heat Loss • Flooding • Reboiler and Reflux composition • VLE Data for the column trays • Materials Balance • Conclusions

  3. Objective • Observe and analyze performance of batch distillation.

  4. Equipment

  5. Analysis • Calculation of the overall heat transfer coefficient, U, was done using the following equation. TR(0) =Reboiler Temp at time=0 TA = Ambient Temperature TR =Reboiler Temp at time=t • Using this equation as a model we were able to fit U to best fit our data range. Column Reboiler TA A TR, m, Cp

  6. Heat Loss without Heat Input Heat Loss with Pure Water Heat Loss with Pure Methanol 95 W 52 W 156 W 102 W 151 W 121 W 156 W 102 W 300 W 120 W Water QL=858 W Methanol QL=497 W

  7. Water, T2 Water, T1 Vapor Liquid Enters and Exits at T3 Condenser Equations: Q=m*Cp*ΔT Q=UA ΔTLM Estimated A= 1325 cm2 x the % of Condenser used Water: Methanol: Q=1.13 kW Q=0.88 kW

  8. Flooding

  9. VLE Diagram Vapor, y Liquid,x

  10. Reboiler Composition vs. Time 75% Reflux 0% Reflux 0% Reflux: 3200 W 75% Reflux: 2500 W Initial xm: 23% Initial Vm: 16.86 L

  11. Reflux Composition vs. Time 75% Reflux 0% Reflux Collected 1.9 L/hr at 75% Reflux Collected 6.1 L/hr at 0% Reflux

  12. VLE Data for Column Trays: VLE Diagrams Methanol-Water VLE 75% Reflux

  13. Continued VLE Data: VLE Diagrams Methanol-Water VLE 75% Reflux

  14. Material Balance xAI*M=xAF*M 75% Reflux xAI=23 mol % MeOH xAF=98 mol % MeOH MF=6.3 g MeOH/min 0% Reflux xAI=23 mol % MeOH xAF=30 mol % MeOH MF=101.5 g MeOH/min MF, xA Distillate M, xA Reboiler

  15. 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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