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Basically we understand the presentation from group 5 and group 10. Our concept of solving is similar with them.

We have a question to ask. When constructing the balance of a system involving reaction, how should we know when shall we put positive or negative sign for the term kC?

We also hope to have the scheme for previous stage from Professor so that we can make revision to prepare for our test.

Thank you.

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Group 1
After we watched the presentation videos from both groups, we found that our solutions are almost in the same way. However, there are some parts we are confused on when we completing our task:          1)When link the feed tray to reflux drum to find out the relationship between the feed composition and the methanol production, it has involved a lot of trays (feed tray to 7th tray to 8th tray … until reflux drum).
So, is that okay for one stage having more than one relationships? Because to link this, only feed tray will need two relationships Gf(s) and G6(s), while others just only one, Eg: 7th tray = G7(s); 8th tray = G8(s).

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A few confusions here regarding CASE STUDY 2B.

1. May I know in most of the conditions, are we allowed to assume dm/dt=0 (perfect control) for condenser and reboiler? Or still need to depend on specific situation?

2. Actually is it necessary to substitute in the relative volatility formula before we do our linearization?

Thank you.

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1) How to calculate steady state gain and time constant?
2) How do we decide the unknowns used for K and "tau"?
3) Why is the deviation variable of vapor and liquid flow (V' and L') in the stages must be consider. Can it be zero?

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Do we need to substitute the relative volatility equation into component balance equation before we linearize it?

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1. How should we decide which unknowns can be represents by the K and tau?

2. How should we differentiate the unknown whether it is mass, molar or volume flowrate? As sometimes the unknowns use is q or w instead of m.

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This is the energy balance model we discussed. Is this the correct method to relate composition of bottom product (xb) to amount of steam (m)?

if yes,
May I know how to linearise the term highlighted in the box? or any other method to relate composition of bottom product (xb) to amount of steam (m)?

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This is Group 4's answer for the transfer function of energy balance