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5Reaction material balances (1)

5Reaction material balances (1) - CHEE 2331 Chemical...

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CHEE 2331 Chemical Processes Chemical Processes Reaction Material Reaction Material Balances Balances Chapter 4, pages 116 Chapter 4, pages 116 - - 153 153 Department of Chemical and Department of Chemical and Biomolecular Biomolecular Engineering Engineering
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Reaction systems… Stoichiometric reaction: CH 4 + H 2 O = CO + 3H 2 reactants products 1 1 1 3 stoichiometric coefficients Stoichiometric ratio: ratio of the components, e.g. CH 4 /H 2 O = 1 Limiting reactant: the reactant that disappears first CH 4 H 2 O CO 3H 2 Initial: 1 5 0 0 Final: 0 4 1 3
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Fractional conversion: f CH4 = moles of CH 4 reacted/initial moles of A fraction of initial limiting reactant reacted CH 4 + H 2 O = CO + 3H 2 Initial: 1 5 0 0 Final: 0.5 4.5 0.5 1.5 f CH4 = 0.5/1.0 = 0.5 or 50% Extent of reaction: moles of limiting reactant reacting, ξ ξ A = n Ao - n A e.g. for the example above, ξ CH4 = 0.5 moles, and n CH4 = n CH4,o ξ CH4 = 1 – 0.5 = 0.5 moles n H2O = n H2O,o ξ CH4 = 5 – 0.5 = 4.5 moles n CO = n CO,o + ξ CH4 = 0 + 0.5 = 0.5 moles n H2O = n H2O,o + 3 ξ CH4 = 0 + 1.5 = 1.5 moles What is the relation between f A and ξ A ?
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