Page 432 - Chemical process engineering design and economics

412 Chapter?

p power per unit volume, pressure or partial pressure

P power

Q heat-transfer rate

QR O initial heat-transfer rate
r rate of reaction

initial rate of reaction of A
r Ao
R gas constant

Sew WHSV (weight hourly space velocity) — Ib feed/h per Ib of catalyst

3
3
Scv GHSV (gas hourly space velocity) — ft gas/h per ft of catalyst
3
3
SCL LHSV (liquid hourly space velocity) — ft liquid/h per ft of catalyst
t time

batch time
t B
tc time required to clean a batch reactor
time required to empty a batch reactor
t E
time required to load a batch reactor
t F
tn time required to heat a batch reactor to the reaction temperature

t R reaction time
T temperature

U overall heat-transfer coefficient

Vs superficial velocity

V B bed volume

V r reaction volume

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