5 - Energy Balances with Chemical Reaction_S10

5 - Energy Balances with Chemical Reaction_S10 - Copyright...

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Unformatted text preview: Copyright 2010 D.B. Dadyburjor and J. A. Shaeiwitz Energy Balances with Chemical Reaction ChE 202 Spring 2010 Copyright 2010 D.B. Dadyburjor and J. A. Shaeiwitz Retrospective Sub-processes considered 9 Change in pressure at constant temperature 9 Change in temperature at constant pressure 9 Change in T or P at constant volume 9 Change in phase at constant P and T 9 Mixing of pure components to multicomponent system at constant T and P (and reverse) Pure components in stoichiometric amounts reacting to form pure products(s) Copyright 2010 D.B. Dadyburjor and J. A. Shaeiwitz Now ... 9 Change in pressure at constant temperature 9 Change in temperature at constant pressure 9 Change in T or P at constant volume 9 Change in phase at constant P and T 9 Mixing of pure components to multicomponent system at constant T and P (and reverse) Reactions Simplest -- Pure reactant(s) in stoichiometric amounts reacting at constant T and P to form pure products(s) Copyright 2010 D.B. Dadyburjor and J. A. Shaeiwitz Recall Nomenclature - 1 (Chap 4) Stoichiometric coefficient for component j: > 0 for product, < 0 for reactant = 0 for inert Extent of reaction, [moles] {or [moles/time]} Stoichiometry requires that is independent of j Fractional conversion of (limiting) reactant j: [-] Other terms for more than one reaction (N r > 1) j } / ) ( { ; / ) ( , , , , j in j out j j i j f j n n or n n & & & = } / ) ( { / ) ( , , , , , , i j f j i j i j f j i j n n n or n n n f & & & Copyright 2010 D.B. Dadyburjor and J. A. Shaeiwitz Calculating H, U for f = 1 at constant T and P Can show, at constant T & P, pure reactants/products ) ( ) , ( ) , ( in r r p p p r f Q P T H n P T H n H n = =...
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5 - Energy Balances with Chemical Reaction_S10 - Copyright...

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