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L12-13_Material_Balances - Material and Energy Balances...

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1 Material and Energy Balances 03/21/10 Mass Balance Calculations Multi-unit 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 multi-unit processes Derive and solve material balance problems
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3 Material and Energy Balances 03/21/10 Multiple unit processes Industrial chemical processes generally involve more than one unit operation One or more chemical reactors with units for Mixing reactants Blending products Heating and cooling process streams Separating products from unconsumed reactants Removing potentially hazardous products or pollutants
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4 Material and Energy Balances 03/21/10 System A “system” is any portion of a process that can be enclosed within a hypothetical box (boundary) It may be the Entire process An interconnected combination of some of the process units A single unit A point at which two or more process streams come together or one stream splits into branches The input and outputs are the process streams that intersect the system boundary
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