Distillation Heat Analysis ENCH 435 September 20, 2005 Jason Hixson Michael Hickey Don Scott.

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Presentation transcript:

Distillation Heat Analysis ENCH 435 September 20, 2005 Jason Hixson Michael Hickey Don Scott

Condenser Reflux Feed Reboiler Trays 1-6 Trays 7-12 CW in CW out Q Heater

Calibrations All thermometers were calibrated by plotting known temperatures (ambient air, boiling point of water, and the boiling point of methanol) to those read by each thermometer. The equation of best fit was then used to correct measured temperature values.

Setup Each liquid was heated to boiling point and allowed to cool to room temperature. The temperature was then measured over an extended length of time.

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

Column Losses The losses from the column can be grouped into three sections: -Trays -Feed -Reflux These were found using the same method shown in the reboiler analysis.

The System Heat losses can be found using the following equation: Q L =UAΔT Losses will be assumed to only occur throughout the reboiler and column. We will also have heat transferred through the condenser. If all analysis is correct then we should have the following: Q Heater -Q Condenser =ΣQ L

Condenser Q=m*Cp*ΔT Q=UA ΔT LM Estimated A= 1325 cm 2 Water Methanol Q=1.13 kW Q=0.88 kW M1, T1 M1, T2

Condenser Reflux Feed Reboiler Trays 1-6 Trays 7-12 CW in CW out Q Heater Q Reflux = 95 W 52 W Q Feed = 69 W 17 W Q Trays 7-12 =156 W 102 W Q Trays 1-6 =156 W 102 W Q Condenser = 1.13 kW 83 kW Water Methanol Q Reboiler =300 W 120 W Q Joint = 42 W 52 W

Total System Losses Water Q L =880 W $ Loss =23.39 per month Methanol Q L =497 W $ Loss =13.29 per month Losses based on continuous run.