L13_Bypass_and_recycle

L13_Bypass_and_recycle - Material and Energy Balances...

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1 Material and Energy Balances 03/21/10 Bypass and Recycle Processes
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2 Material and Energy Balances 03/21/10 Objectives At the end of this chapter, you should be able to: Apply material balances for processes involving bypass and recycle Derive and solve material balance problems
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3 Material and Energy Balances 03/21/10 Recycle One of the more common processing configurations is the material recycle structure These are particularly useful for reactors, where they allow better control of reactor selectivity when multiple reactions occur
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4 Material and Energy Balances 03/21/10 Recycle When we study recycle systems, we are often asked to calculate the recycle ratio . Usually, this is found by dividing the mass flow of the recycle stream by the mass flow of the "fresh feed" entering the system. In the industrial world, recycle ratios have important consequences for system performance and operating costs
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5 Material and Energy Balances 03/21/10 Recycle A common recycle structure is the reactor/separator which is used to recover unreacted material and return it to the reactor. The "separator" may be a single piece of equipment or it may be an entire process on its own
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6 Material and Energy Balances 03/21/10 Bypass A related process structure is the bypass system One use of bypass is to obtain precise control of the output stream, as when a small wet air stream bypasses a drier so that the output humidity can be regulated
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7 Material and Energy Balances 03/21/10 Solving Recycle and Bypass Problems The methods for solving recycle and bypass problems are basically the same. In the steady state, there is no buildup or depletion
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This note was uploaded on 03/20/2010 for the course IMSE tb1073 taught by Professor Musharaf during the Spring '10 term at University of Malaya.

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L13_Bypass_and_recycle - Material and Energy Balances...

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