Page 406 - Chemical process engineering design and economics

386 Chapter 7

Aj =f(V R) — Table 7.3 (7.8.10)

If Q R <Qj — thenA R = Aj (7.8.11)
If Q R > Qj — then calculate Q c

Qc=U c Ac(T c -T R ') (7.8.12)

T c = (T c,' + Tc2')/2 (7.8.13)

2
3
Ac = 4.6 V R 2/3 — Ac (m ), V R(m ) (7.8.14)
If Q Ro > Qj and Q Ro < Q c — then A R = A c (7.8.15)
If Q Ro > Qj and Q Ro = (Qj + Q c), then A R = A, + A c
If Q Ro > (Q, + Q c) — then A R = A E'

P=pV R (7.8.16)

p = ^application') — Table 7.7 (7.8.17)

System Properties

Ah^IiCpi'OY-To') (7.8.18)

Ah 2 = Z iCpi '(T R '-T 0 ') (7.8.19)

AH° R = H° c' - (H° B' + H° A') (7.8.20)

k = A'exp (-E'/ R'T R') (7.8.21)

Uj = f(reaction solution', jacket fluid') — Table 7.6 (7.8.22)

U c = f(reaction solution', coil fluid') — Table 7.6 (7.8.23)

Unknowns

QRO - r Ao -A R - V R - Ah R -t B - t R - V r - V R - Qj -U, - A, - Tj - Q c - U c - A c - T c -
P-p-Ah 1 -Ah 2 -Ah°R-k

Copyright © 2003 by Taylor & Francis Group LLC