Introduction to Chemical Engineering Processes by Adrian Duncan

By Adrian Duncan

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The most obvious is to gather additional information, such as measuring additional temperatures, flow rates, and so on until you have a well-defined problem. Another way is to use additional equations or information about what we want out of a process, such as how much conversion you obtain in a reaction, how efficient a separation process is, and so on. Finally, we can make assumptions in order to simplify the equations, and perhaps they will simplify enough that they become solvable. The method of analyzing systems to see whether they are over or under-specified, or if they are well-defined, is called a degree of freedom analysis.

In equilibrium and energy balance calculations, temperature and pressure also become important unknowns. In a reactor, you should include the conversion as an unknown unless it is given OR you are doing an atom balance. 2. Subtract the number of Equations you can write on the process. This can include mass balances, energy balances, equilibrium relationships, relations between concentrations, and any equations derived from additional information about the process. 3. The number you are left with is the degrees of freedom of the process.

Independent mass balances yet. We of course have a choice on which two to use. In this particular problem, since we are directly given information concerning the amount of solid in stream 4 (the product stream), it seems to make more sense to do the balance on this component. Since we don't have information on stream 2, and finding it would be pointless in this case (all parts of it are the same as those of stream 1), lets do an overallsystem balance on the solids: NOTE: Since there is no reaction, the generation term is 0 even for individual-species balances.

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