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CBE682 SEPARATION PROCESSES II

TUTORIAL: CRYSTALLIZATION

QUESTION 1

 A hot solution of Ba(NO3)2 from an evaporator contains 30.6 kg Ba(NO3)2/00 kg !20 an"goes to a cr#stalli$er %here the solution is coole" an" Ba(NO3)2 cr#stalli$es. B# cooling& 0'

of the original %ater present evaporates. or a fee" solution of 00 kg total& calculate the

follo%ing

a) *he #iel" of cr#stals if the solution is coole" to 2+0 ,& %here the solu-ilit# is .6 kg

Ba(NO3)2/00 kg total %ater.

-) *he #iel" if coole" instea" to 23 ,& %here the solu-itlit# is .0 kg Ba(NO3)2/00 kg

total %ater.

QUESTION 2

 A hot solution containing 000 kg of g1O an" %ater having a concentration of 30 %t '

g1O is coole" to 2. ,& %here cr#stals of g1O!2O are precipitate". *he solu-ilit# at

2. , is 2.4 %t ' anh#"rous g1O  in the solution. 5alculate the #iel" of cr#stals

o-taine" if 4 ' of the original %ater in the s#stem evaporates on cooling.

QUESTION 3

 A fee" solution of 226 kg at 32.6 , containing .2 kg g1O/00 kg total %ater is coole"

to 23.2 ,& %here g1O!2O cr#stals are remove". *he solu-ilit# of the salt is 30.+ kg

g1O/00 kg total %ater. *he average heat capacit# of the solution can -e assume" as

2.+3 k/kg., an" the heat of solution at 2+.2 , is 73.3 8 03 k/kg mol g1O!2O.

5alculate the #iel" of cr#stals an" make a heat -alance to "etermine the total heat a-sor-e"&

assuming that no %ater is vaporise"& an" the value of heat of solution is the same at 2+.2 ,

an" 23.2 ,.

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ANSWER SCHEME

QUESTION 1

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QUESTION 2

QUESTION 3 : Please reer !e"! #$$% $r e"a&'le(