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Essentials of Chemical Reaction Engineering, 2nd Edition by H. Scott Fogler

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Example 8-6 Complex Reactions in a Liquid-Phase CSTR

The complex reactions discussed in Example 8-5 now take place in the liquid phase in a 2,500 dm3 CSTR. The feed is equimolar in A and B with FA0 = 200 mol/min and the volumetric flow rate is 100 dm3/min. The rate constants are

k1A=10(dm3mol)2/minandk2c=15(dm3mol)4/min

Find the concentrations of A, B, C, and D exiting the reactor, along with the exiting selectivity, S˜C/D.

S˜C/D=CCCD

A+2B→C 2A+3C→D

Solution

Liquid-Phase CSTR: υ = υ0 (Polymath Formulation)

Illustration labeled "CSTR results" shows a CSTR vessel with a rotating stirrer filled with mixture. The arrows labeled "A and B" to an inlet at the top left and an outlet at the bottom right is labeled "A, B and C, D."

Mole Balances

(1)f(CA)=υ0CA0υ0CA+rAV(E8-6.1)
(2)f(CB)=υ0CB0υ0CB+rBV(E8-6.2)
(3)f(CC)=υ0CC+rCV(E8-6.3)
(4)f(CD)=υ0CD+rDV(E8-6.4)

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