CBE682 SEPARATION PROCESSES II TUTORIAL: CRYSTA LLIZATION 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$er %here the solution is coole" an" Ba(NO 3)2 cr#stalli$es. B# cooling& 0' of the original %ater present evaporates. or a fee" solution of 00 kg total& calculate the follo%ing a) *he #i el " of cr#st al s if t he sol ut ion is coole " to 2+0 ,& %her e the solu-i li t# i s . 6 kg Ba(NO3)2/00 kg total %ater. -) *he #i el" if coole" instea" t o 23 ,& %here the sol u-itli t# i s .0 kg Ba(NO 3)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#s tals 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 h eat of soluti on at 2+.2 , is 73 .3 8 0 3 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 ,.