HW 4 - p 5.24 - Distillation Calculations Using the Edmister Group Method - 9 pts
A bubble-point liquid feed is to be distilled as shown in Figure 5.25. Use the Edmister group method to estimate the mole-fraction compositions of the distillate and bottoms. Assume initial overhead and bottoms temperatures are 150 and 250oF, respectively.
posted by Dr. B at 2:34 PM
5 Comments:
I just posted the Excel template on the course website on the downloads page.
You can STOP after you have determined theta and used it to correct the di and bi values. You do NOT need to improve your estimated T values and solve the problem again. Only because it is not part of this assignment.
In the template you have the temperature Tr at 230F... shouldnt this be 250F?
wheelie 3:55 PM:
Yep, it should be 250. But please use 230 degF to make the grader's life easier. I will send an email out about this.
I'm not sure how you calculate the component distilate and bottoms in step 7 on the template. I got bi/di but the only other equations with di and bi also include vFi and lFi which are only related with the equation Afi=lFi/vFi which was already used to solve for bi/di.
karen:
Do a material balance over the whole column for each species...you get one eqn in 2 unknowns, bi & di. The other eqn is the known value of (bi/di) that you get from Kremser. Solve the two eqns simultaneously.
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