lec2 - L2-1 Announcements Slide with announcements will be...

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Copyright © 2011, Prof. M. L. Kraft. All rights reserved L2-1 Announcements • Slide with announcements will be posted closer to class or immediately afterwards For today: • Review basic molar balance equations (BME) • Apply to ideal batch, CSTR, PFR & PBR reactors • Operational considerations
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Copyright © 2011, Prof. M. L. Kraft. All rights reserved L2-2 Review: Why are we here? Chemical reaction engineering is at the heart of virtually every chemical process. It separates the chemical engineer from other engineers. Industries that Draw Heavily on Chemical Reaction Engineering (CRE) are: CPI (Chemical Process Industries) Dow, DuPont, Amoco, Chevron We will use our knowledge of reaction kinetics and material & energy balances to select reactor type, size, and configuration to maximize the space-time yield of the desired product
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Copyright © 2011, Prof. M. L. Kraft. All rights reserved L2-3 Review: Chemical Reaction Rates • A species has reacted when it loses its chemical identity – Decomposition – Combination – Isomerization • Rate of reaction: the rate at which a species looses its chemical identity per unit volume r A : the rate of formation (generation) of species A per unit volume [e.g., mol/m 3 ·s] -r A : the rate of disappearance (consumption) of species A per unit volume Consider the isomerization A Æ B r A = the rate of formation of species A per unit volume -r A = the rate of a disappearance of species A per unit volume r B = the rate of formation of species B per unit volume
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Copyright © 2011, Prof. M. L. Kraft. All rights reserved L2-4 Review: Basic Molar Balance BMB () mol dt d s mol s mol s mol dt dN G F F j j j 0 j = + Rate of flow of j into system - Rate of flow of j out of system + Rate of generation of j by chemical rxn - Rate of decomposition of j = Rate of accumulation combine N j : moles j in system at time t System volume F j0 F j G j
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Copyright © 2011, Prof. M. L. Kraft. All rights reserved L2-5 Review: Rate of Generation (G j ) dt dN G F F j j j 0 j = + V in rate uniform dt dN V r F F j j j 0 j = + V in rate nonuniform dt dN dV r F F j V j j 0 j = + In Out - +Generation = Accumulation V r G j j = = V j j dV r G () volume volume time moles time j moles × =
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This note was uploaded on 01/27/2011 for the course CHEM 6847 taught by Professor Liu during the Spring '10 term at University of Illinois, Urbana Champaign.

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lec2 - L2-1 Announcements Slide with announcements will be...

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