3 - Chemical Engineering Applications of Material Balances...

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1 Chemical Engineering Applications of Material Balances Dr. Susan Montgomery ChE program advisor November 3, 2011
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2 Keeping track of “stuff” Aero Fuels burning in airplane AOSS Pollutants in atmosphere BME Human metabolism ChE Reactants and products Civil Concrete production EECS Semiconductor manufacturing IOE Warehouse inventory MSE Polymer production ME Automobile fuels NAME Water ballast Nuclear Cooling water in reactor
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3 Material Balances Decaffeination of coffee What is the purity of the coffee? How much caffeine remains? Kidney dialysis What flows in and out? How much waste is removed? web.ukonline.co.uk/webwise/spinneret/ human2/andial.htm
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General balance equations ?? ?? CHECKING ACCOUNT ?? System: Checking account Basis: 1 month (if not given select arbitrary one) Money balance: List activities that go on involving money in a checking account that could result in a change in your balance.
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General balance equations Deposits Withdrawals CHECKING ACCOUNT Interest Fees System: Checking account Basis: 1 month (if not given select arbitrary one) Money balance: Initial + deposits – withdrawals + interest - fees = final deposits – withdrawals + interest - fees = final - initial deposits – withdrawals + interest - fees = accumulation where accumulation = final – initial
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For engineering systems Inputs Outputs SYSTEM Generation Consumption System: One or more components Basis: Given by problem or select arbitrary one Mass balance: Inputs – outputs + generation – consumption = accumulation F in - F out + R gen - R cons = R acc
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Special cases of mass balances Inputs – outputs + generation – consumption = accumulation F in - F out + R gen - R cons = R acc Continuous, steady state F in - F out + R gen - R cons = 0 No reaction F in - F out = R acc Batch R gen - R cons = R acc = FIN-INTL Can write one overall balance and one equation for each species
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This note was uploaded on 01/17/2012 for the course ENGR 110 taught by Professor None during the Fall '08 term at University of Michigan.

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3 - Chemical Engineering Applications of Material Balances...

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