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The reboiler had been filed with Methanol. The trays had been drained of most of the liquid on them. They had had MeOH-Water mixtures on them. Below is a graph of the time response of the temperatures in the column. At point A, the Reboiler temperature is rising. It rises to around 67C and slowly rises over the rest of the experiment. At point B, the upper trays' temperatures are rising and they rise to up to 80C. One thing I'd like for students to explain is how the vapors from the Reboiler at about 70C can heat the upper trays so that they have temperatures HOTTER than the Reboiler vapor. At point C, finally, the top tray (Tray 1) reaches its peak temperature. The trays with water on them apparently condense the MeOH vapors from below, diluting the mixture with MeOH and lowering its boiling point. So, the temperature peaks and then falls off. The liquid on the upper trays (with their water content) then drain down to the lower trays, making the lower trays' boiling point to rise. This is displayed by the humps in the curves at point D. By the time at point E, The trays have all

Reboiler Methanol

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Reboiler Methanol

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The reboiler had been filed with Methanol

The reboiler had been filed with Methanol. The trays had been drained of most of the liquid on them. They had had MeOH-Water mixtures on them.

Below is a graph of the time response of the temperatures in the column.

At point A, the Reboiler temperature is rising. It rises to around 67(C and slowly rises over the rest of the experiment.

At point B, the upper trays' temperatures are rising and they rise to up to 80(C. One thing I'd like for students to explain is how the vapors from the Reboiler at about 70(C can heat the upper trays so that they have temperatures HOTTER than the Reboiler vapor.

At point C, finally, the top tray (Tray 1) reaches its peak temperature. The trays with water on them apparently condense the MeOH vapors from below, diluting the mixture with MeOH and lowering its boiling point. So, the temperature peaks and then falls off.

The liquid on the upper trays (with their water content) then drain down to the lower trays, making the lower trays' boiling point to rise. This is displayed by the humps in the curves at point D.

By the time at point E, The trays have all

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62.75864.19864.62965.4165.41264.55565.74264.11364.49666.82769.158

Distillate

Reboiler

T2

T1

T4

T6

T7

T11

T10

T12

A

B

C

D

E

T(D)

T1

T2

T4

T6

T7

T(F)

T10

T11

T12

T(R)

Sept-16-data

Run TimeT(D)T1T2T4T6T7T(F)T10T11T12T(R)CWSCWRLOOSE 9/16/97 - - - 2:50 PM

0.63323.61122.84222.86124.42622.40922.29722.84323.4921.82724.84325.31824.51125.43622.956

1.63323.61722.84122.86724.41322.4122.30522.85823.48421.83424.82725.76524.55625.44322.704

2.63323.61622.83722.86324.40822.41722.31422.84123.4821.79924.8327.66824.55225.48422.693

3.63323.63222.84122.88424.41622.47122.25422.85723.4621.78324.85530.14724.55125.4722.719

4.63323.61222.8522.86324.43122.43822.28322.85723.44221.79424.9532.40124.5525.46422.656

5.63323.61122.83522.88224.43822.47422.25322.86923.44121.85125.14734.59924.53725.46522.692

6.63323.61822.83222.86824.49422.4522.26422.83623.47121.78625.2236.76524.53325.45622.723

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174.66762.82164.2864.75866.06366.56165.43467.06964.5165.77867.19769.09724.88127.49223.326

175.66762.82264.29164.73866.01266.48365.3666.9764.47665.67467.17469.01624.90727.60623.337

176.66762.82164.27864.74665.94466.37865.30666.87564.4465.62867.16169.07524.91827.63623.346

177.66762.79264.26464.74865.91466.29565.23266.78864.41365.53667.16269.02924.92227.58423.32

178.66762.79764.2664.71665.85366.22365.17366.69964.38165.4467.13869.14524.91827.72623.281

179.66762.78264.25464.70965.82266.14865.1266.61764.39565.32567.11169.15624.92327.67723.316

180.66762.79164.25364.69865.73566.07665.06366.58864.3665.2667.10769.14824.92127.71423.322

181.66762.78964.23464.68765.68866.01565.01766.4764.30465.19167.09369.06724.91627.61223.315

182.66762.77264.21564.68365.70865.92564.97466.37864.33165.15667.05569.08424.90527.68623.306

183.66762.78464.22164.68265.67665.88164.92966.31464.27865.05267.04569.13524.88427.80123.33

184.66762.79464.22264.67765.62765.84264.88266.25464.25764.98367.02969.20824.87227.63823.355

185.66762.77464.24964.65865.57265.7964.8466.20464.32664.89467.00169.08224.85127.82323.299

186.66762.7764.21564.6765.57965.72464.80766.14964.21564.86966.98769.14924.83827.823.276

187.66762.7664.21564.6565.52165.68164.79966.08464.19664.77966.96969.17124.84227.73523.315

188.66762.77564.21564.65165.50865.63764.73366.03964.19364.78266.95169.14124.84227.75923.281

189.66762.77564.22264.66265.49365.59164.69565.98364.16864.67766.92869.14424.84827.66623.226

190.66762.79364.22964.64565.45565.54364.67965.94464.16464.65366.92669.19224.85827.76623.286

191.66762.75964.22664.64665.44365.52864.65765.964.15364.61666.90869.18324.87427.92423.306

192.66762.75364.21564.66365.45665.49264.64665.84864.15464.58466.89569.20824.89927.88623.294

193.66762.75664.21264.62465.4265.46864.60865.81564.13264.55266.87169.20124.90428.01523.315

194.66762.77264.20764.64665.41365.44564.58365.80364.12664.51766.8669.26324.93928.09123.115

195.86762.75864.19864.62965.4165.41264.55565.74264.11364.49666.82769.15824.96127.84523.196