A modified problem from John Geankoplis book on Unit OperationsDeskripsi lengkap
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Crystallization Problem (Geankoplis 12.11-1)Deskripsi lengkap
Crystallization Problem (Geankoplis 12.11-1)
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Problem Set in Crystallization
1. 19.20 /Foust. A 20 weight percent solution of of Na2SO4 at 175 oF is pumped continuously to a vacuum crystallizer from which the product magma is pumped at 60 oF. What is the composition of this magma and what percentage of Na 2SO4 in the feed is recovered as Na2SO410 H2O crystal after this magma is centrifuged? Neglect the BPR of the solution 2. 19.21/Foust. A solution of 32.5% MgSO4 originally at 150°F is to be crystallized in a vacuum adiabatic crystallizer to give a product containing 4000 lb/hr of MgSO4 7H2O crystals from 10,000 lb/hr of feed. The solution BPR is at 10°F. Determine the product temperature, pressure and weight ratio of mother liquor to crystalline product. 3. 27.2 (MSH) A solution of MgSO4 containing 43 g of solid per 100 g of water is fed to a vacuum crystallizer at 220 F. The vacuum in the crystall izer corresponds to a water boiling temperature of 43 F and a saturated solution on MgSO 4 has a BPR of 2 F. How much solution must be fed to the crystallizer to produce 900 kg of epsom (MgSO4.7H2O) salt per hour? 4. It is desired to cool 1000 kg/hr of a 30 % solution of sodium sulfate to 25oC to crystallize to recover 60% of the salt as glauber’s salt. The Boiling point elevation for the solution is 2oC(
3.6oF). Find the feed temperature. 5. A solution of 25% CaCl2 originally at 150°F is to be c rystallized in a vacuum adiabatic crystallizer by evaporation and cooling a 10,000 lb/hr of feed to 60 oF. Using the boiling point nomograph in Perry’s handbook, find the BPR and the operating pressure in the vapor space. Determine the
type of crystal formed and the rate of evaporation and crystallization. 6. A solution 28 weight percent Na2SO4 is to be crystallized to yield Glau ber’s salt (Na2SO410H2O) in a four-section Swenson-Walker crystallizer. It is fed to the unit at 100oF and is cooled with 50oF water flowing countercurrently. The crystallizer has a cooling surface of 3 ft2 of length and operates with an overall coefficient of heat transfer of 20 Btu/hr ft2 oF across the cooling surface. The water leaves leaves at 75oF.What feed rate to the crystallizer should be used to obtain 75 percent of the Na2SO4 in the feed as Na2SO4.10H2O crystals? 7. 12.11-1 Geankoplis Geankoplis [Replace 17oC with 20oC (use the solubility table in the handbook) and 10% by 15%]
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8. 12.11-2 Geankoplis: [Replace 363 K with 370K and 293 by 298K (use the solubility table from the Handbook); replace b) 5% to 10%)
9. 12.11-3 Geankoplis: Replace 30 wt% to 25 wt %. and 288.8K to 285K (use the solubility table from the handbook)
10. 12.11-4 Geankoplis: Replace 10000 lbm to 2000 kg. Replace 130oF to 50oC and 80oF to 24oC (use Solubility data from the table in the Handbook)
11. 12.11-5 Geankoplis: Replace 283.2K with 285K (use the solubility table in the handbook
