
xxiii
Nomenclature
Notations
a activity of a catalyst
a,b,…,r,s stoichiometric coefcients for reacting substances A, B…R, S…
a interfacial area per unit volume of tower (m
2
/m
3
)
A cross-sectional area of a reactor (m
2
)
A,B reactants
C concentration (mg/L)
C
M
Monod constant (mol/m
3
); or Michaelis constant (mol/m
3
)
C
p
heat capacity (J/mol K)
mean specic heat of feed, and of completely converted product stream, per mole of key
entering reactant (J/mol A+ all else with it)
d diameter (m)
d order of deactivation
D molecular diffusion coefcient (m
2
/s)
D
e
effective diffusion coefcient in porous structures (m
3
/m solid.s)
ei(x) an exponential ...