Page 394 - Chemical process engineering design and economics
P. 394
374 Chapter 7
Table 7.4 Continued
Mole Balance
ran. A' = n^ +1;A + (x n+ljA '-x njA ')m n>A (7.4.1)
Energy Equation
(Ah n) nV + (AH° R) (x n + ,, A - x n, A') m,,, A = Q n+ (Ah n+1) m^i (7.4.2)
Rate Equations
-r n , A V r = (x n+1 , A -x njA ') m,,, / (7.4.3)
r n , A =f(c n+1 , A ) (7.4.4)
c n +i,A = m n+1;A /V v ' (7.4.5)
V R = f(V r) — from Table 7.3 (7.4.6)
Qj = Uj Aj (Tj -T R') (7.4.7)
T J = (T J1'+ T J2')/2 (7.4.8)
Aj = f( V r) — Table 7.3 (7.4.9)
If Q n < Qj — thenA R = Aj (7.4.10)
If Q n > Qj — then calculate Q c
Qc=U c Ac(Tc-T R ') (7.4.11)
T c = (T Ci' +T C2 ')/2 (7.4.12)
2
Ac = 4.6 V r 2/3 — A c (m ), V r (m ) 3 (7.4.13)
If Q n < Q c — thenA R = A c (7.4.14)
If Q n > Q c and Q n < Qj + Q c — then A R = Aj + A c
If Q n > Qj + Q c — then A R = A E'
P n = pV r (7.4.15)
p = ^application') — Table 7.7 (7.4.16)
Copyright © 2003 by Taylor & Francis Group LLC
