From Separation Processes: 4M3
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| * '''Updated''': Feedback about your [[Course_project_-_2012|course project outline]] has been sent. Feel free to reply with any comments, otherwise, you should have started collecting the information you need to work on your report, such as equations on how to design the separator and capital & operating costs. | | * '''Updated''': Feedback about your [[Course_project_-_2012|course project outline]] has been sent. Feel free to reply with any comments, otherwise, you should have started collecting the information you need to work on your report, such as equations on how to design the separator and capital & operating costs. |
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| * <span style="color:#AA4444">''Important note''':</span> '''there will be no teaching on Friday morning, 08:30 to 09:20.''
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| ** I '''will be at the class''' though to answer any questions regarding assignment 4.
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| ** There will be a [[Liquid-liquid_extraction_-_2012|tutorial-style question (slide 58)]] that you can ask questions on. This question will be in assignment 5 ... so get a head start.
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| * Please note for assignment 4, question 5, you will require making an important correction to the membrane notes: slide 76: \(R = 1 - \displaystyle\frac{C_P}{C_F} \) | | * Please note for assignment 4, question 5, you will require making an important correction to the membrane notes: slide 76: \(R = 1 - \displaystyle\frac{C_P}{C_F} \) |
Revision as of 14:36, 3 November 2012
Separation Processes: CHE 4M3
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Announcements (previous ones)
- Updated: Feedback about your course project outline has been sent. Feel free to reply with any comments, otherwise, you should have started collecting the information you need to work on your report, such as equations on how to design the separator and capital & operating costs.
- Please note for assignment 4, question 5, you will require making an important correction to the membrane notes: slide 76: \(R = 1 - \displaystyle\frac{C_P}{C_F} \)
One hint and one update for assignment 4, question 5:
- The \(A_\text{salt}\) and \(A_\text{solv}\) terms are not the area of the membrane: they are the permeances of the salt and solvent respectively. This unfortunate notation is widely used though in most texts.
- There is a correction, the feed concentration should be 2.5 g NaCl per liter in the feed (not 2.5 wt% NaCl). I apologize for wasting your time for those of you that have been iterating with negative concentrations.
- And another hint. I found a way to solve question 5 that leads to faster convergence:
- Specify \(C_F\) and \(\theta\)
- Guess \(C_R\) instead
- Calculate \(C_P\) from equation 5
- If your calculated value of \(C_P\) is negative or exceeds \(C_F\), then repeat your guess for \(C_R\), until you get a \(C_P\) that lies between 0 and \(C_F\) and double check also that the rejection coefficient from this \(C_P\) is reasonable, around 90 to 99%.
- This approach to estimate \(C_R\) and then \(C_P\) will get you really close to the final answer.
- Now carry on with the rest of the steps in the notes. It's interesting how simply flipping what you guess first leads to much faster convergence.
- And a final hint: this question is much better to solve on a computer, with goal seek, than by hand. There is tremendous sensitivity to initial guesses, so solving by hand will take too long.
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