Unit Ops Geankoplis

Question 1

Tests on a small scale tank 0.3m diameter

Answer 1

N= 0.346hz or 20.8rpm
P= 9.8W
t= 1.15min

Question 2

A forward-feed double-effect evaporator, having 10m2 of heating surface

Answer 2

mcondenser= 0.15kg/s
SE= 1.57
h1= 2.53 kW/m2K
h2= 1.84 kW/m2K

Question 3

seeds, 20% oil

Answer 3

5 stages
Lo= 20kg
Ln= 40kg
V1= 36kg

Question 4

soda ash is mixed with lime and the liquor from the second of 3 thickeners

Answer 4

CaCO3= 13.7Mg/day
H2O= 129Mg/day
thickener: 
1: 4.34%
2: 0.47%
3: 0.05%

Question 5

in the extraction of acetic acid from an aqueous solution with benzene

Answer 5

LMDF= 0.0087 kmol/m3
OTC= 7.8x10^-4/s
HTU= 1.63m

Question 6

extract acetic acid from dilute aqueous solution with isopropyl ether

Answer 6

NTU= 5.53
K= 0.461 kg/m3-s
delta Ylm= 0.0036

Question 7

a wetted-wall columb is used for absorbing sulfur dioxide from air by means of caustic soda solution

Answer 7

v= 1.73m/s
kG= 7.56 x 10^-4 kg/m2s(kpa)

Question 8

a granular material containing 40% moisturr is fed to a countercurrent rotart dryer

Answer 8

G= 2.07 kg/s
H= 0.0284

Question 9

0.126kg/s of a solid product containing 4 percent water

Answer 9

Qair= 3.16 m3/s
Q= 276 kW
Vair required= 0.66m3/s
Qpreheater= 31kW
Qtotal= 242kW

Question 10

a mixture of water and ethyl alcohol containing 0.16 mole fraction alcohol

Answer 10

8 plates
4th plate from the top
D=13.55
W=78.45

Question 11

it is desired to separate 1 kg/s of an ammonia 30%NH3

Answer 11

9 plates

Qboiler= 617kW

Question 12

quartz of density 2650kg/m3

Answer 12

0.0103 - 0.0126 mm

Question 13

a centrifuge with a phosphor bronze basket, 380mm in diameter

Answer 13

Pc= 2.42 x10^6 pa
t= 15.1 mm

Question 14

a slurry containing 100kg of whiting

Answer 14

Vcake/Vfiltrate= 0.0569
optimum frame thickness = 70mm
frame thickness= 60mm

Question 15

glass spheres are fluidized with water

Answer 15

e= 0.755
density= 1367 kg/m3
p= 3605 N/m2/m

Question 16

what is the yield of sodium acetate crystals from vacuum crystallizer

Answer 16

C=0.18kg/s

Question 17

choose a bucket elevator to handle 150 tons/hr

Answer 17

continuous bucket elevator
h= 80ft
P= 24hp
Belt conveyor
Pempty= 7.2hp
Pload= 7.425hp
Pc= 14.03hp

Question 18

a single effect evaportaor is to concentrate 200001b/hr of 20% solution NaOH

Answer 18

S=15400lb/hr
SE= 0.78
heating surface= 930 ft2

Question 19

a hollow fiber permeater with do=300um

Answer 19

concentration polarization= 0.068

ave. velocity= 0.425 m/s

Question 20

for the permeator of previous provlnlem estimate exit velocity

Answer 20

v= 0.425m/s
delta P= 5.03 atm
delta p= 1.26 atm

Question 21

an acid solution containing 2% by mass of NaNO3 strong acid resin

Answer 21

20%

Question 22

aqueous suspension consisting of particles of density 2500kg/m3 centrifuge with a basket

Answer 22

w= 503 rad/s
Re= 0.46
t= 19.36s

Question 23

investigate the use of gasketed plate heat exchanger

Answer 23

A= 72.92m2
n= 97 plates
methanol channel v= 0.51m/s
brackish water channel v= 0.96m/s