Page 29 - Separation process engineering

n w

moles water in vapor in steam distillation
N

impeller revolutions per second
N

number of stages
N A

2
2
flux of A, lbmol/(h)(ft ) or kmol/(h)(m )
N ,N feed
f
feed stage

transfer to liquid from vapor on stage j, mol component i/s

transfer to vapor from liquid on stage j, mol component i/s

N min
number of stages at total reflux

N feed,min

estimated feed stage location at total reflux
N Po

power number, Eq. (13-52)

N tOD

number of overall extraction transfer units for mass transfer driving force in
concentration units, Eq. (16-81a analog)
Nu

Nusselt number, Eq. (15-33g)
NTU

number of transfer units
O

total overflow rate in washing, kg/h
p

pitch of sieve plate holes, m

p, p tot
pressure, atm, kPa, psi, bar etc.

, p B

partial pressure
P

Number of phases
P