lecture 3

lecture 3 - CHE 349 Lecture 3 CHE 349 Kinetics and Reactor...

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CHE 349: Kinetics and Reactor Design Lecture 3 Lecture 3 Jing Wu 350 Tiernan Department of Chemical Engineering ± [email protected] ² 973-642-7064 CHE 349 - Lecture 3 by Jing Wu 2 Assignments Week 2 Required Reading Lecture 3: Sec. 2.1 – Sec. 2.5, P129-P137. Lecture 4: P83-92 (before 3.3.4) Homework I Lecture 3: P2-3, P2-12 (if you haven’t finish) P2-8 Lecture 4: 3-6, 3-7 (a) Quiz I CHE 349 - Lecture 3 by Jing Wu 3 Space Time (I) The space time, τ , is the time necessary to process one reactor volume of fluid based on entrance conditions. τ≡ V/ v 0 It is the time it takes for fluid of the volume of the reactor size to enter the reactor completely. The space velocity, SV, is the reciprocal of the space time. SV 1/ τ = v 0 /V CHE 349 - Lecture 3 by Jing Wu 4 Space Time (II) PFR F A0 = v 0 C A0 A X A r dX F V = 0 0 = X A A r dX C 0 0 τ 0 0 A A A F F F X = when v = v 0 0 0 0 0 0 0 0 A A A A A Ao A A A C C C v C v C v C F F F X = = = 0 A A C dC dX = = 0 0 A A C C A A r dC v V = 0 A A C C A A r dC Exercise: For CSTR, derive τ in terms of concentration.

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CHE 349 - Lecture 3 by Jing Wu 5 Summary (I) dt dN dV r F F j j V j j = + 0 V r dt dX N A A = 0 = ) ( 0 0 t X A A V r dX N t () exit A A r X F V = 0 A A r dV dX F
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lecture 3 - CHE 349 Lecture 3 CHE 349 Kinetics and Reactor...

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