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1. A crystallizer is charged with 100kg of solution containing 25% Ba (NO3)2 in water. On cooling 10% of original water present evaporates. Calculate yield of crystals when solution is cooled to 283K. The solubility at 283K is 7 kg Ba (NO3)2/ 100 kg total water 640

1. A crystallizer is charged with 100kg of solution containing 25% Ba (NO3)2 in water. On cooling 10% of original water present evaporates. Calculate yield of crystals when solution is cooled to 283K. The solubility at 283K is 7 kg Ba (NO3)2/ 100 kg total water 640

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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CRYSTALLIZATION 1. A crystallizer is charged with 100kg of solution containing 25% Ba (NO₂)2 in water. On cooling 10% of original water present evaporates. Calculate yield of crystals when solution is cooled to 283K. The solubility at 283K is 7 kg Ba (NO3)2/100 kg total water 2. A solution of K₂Cr₂O7 in water contains 13%by weight. From 1000kg of this solution 640 kg of water is evaporated. The remaining solution is cooled to 20°C. Calculate the amount and % yield of K₂Cr₂O7 crystals formed. Solubility at 20°C = 0.39 kmol/1000kg water 3.5000 kg of KCI are present in a saturated solution at 80°C and 20°C are 55 parts and 35 parts per 100 parts of water. (i) Assuming water equal to 3% by wt of solution is lost by evaporation, calculate the weight crystals formed. (ii) calculate the yield of crystals neglecting loss of water by evaporation, KCI crystallizes without any water of crystals. 4.In a crystallization process 2500kg of Glauber salt crystallizes. The mother liquor leaving the process contains 20% Na₂SO4 and during the process 2.5% of feed evaporates as water vapour. If the feed has 40% Na₂SO4 find the weights of feed, mother liquor and loss of water by evaporation. 5, 1000kg of a solution containing 25% Na₂CO3 is slowly cooled at 20°C, During cooling 15% of water originally evaporates. What is the wt of Na₂CO310H₂O crystals formed. The solubility of Na₂CO3 at 20°C is 21.5 kg/100 kg of water. Drying 1. A batch of leather leaving a dryer weighs 1000 kg and contains 5% moisture. During drying the leather loses 50% of its original weight. Determine the following: i) The moisture content of the leather entering the dryer on a dry basis ii) The amount of moisture removed per kg of bone dry leather iii) Water removed as percent of the original water present 2. Wet paper containing 75% water is dried to remove 80% of water present. Determine the composition of the dried paper. 3. Wet lumber (5%moisture) is dried to 1% moisture in a hot air drier. Air fed to the drier contains 0.5% water. The moisture leaving the drier contains 2% (by wt) water. How much air is required to dry 2000kg/h of lumber.
Transcribed Image Text:CRYSTALLIZATION 1. A crystallizer is charged with 100kg of solution containing 25% Ba (NO₂)2 in water. On cooling 10% of original water present evaporates. Calculate yield of crystals when solution is cooled to 283K. The solubility at 283K is 7 kg Ba (NO3)2/100 kg total water 2. A solution of K₂Cr₂O7 in water contains 13%by weight. From 1000kg of this solution 640 kg of water is evaporated. The remaining solution is cooled to 20°C. Calculate the amount and % yield of K₂Cr₂O7 crystals formed. Solubility at 20°C = 0.39 kmol/1000kg water 3.5000 kg of KCI are present in a saturated solution at 80°C and 20°C are 55 parts and 35 parts per 100 parts of water. (i) Assuming water equal to 3% by wt of solution is lost by evaporation, calculate the weight crystals formed. (ii) calculate the yield of crystals neglecting loss of water by evaporation, KCI crystallizes without any water of crystals. 4.In a crystallization process 2500kg of Glauber salt crystallizes. The mother liquor leaving the process contains 20% Na₂SO4 and during the process 2.5% of feed evaporates as water vapour. If the feed has 40% Na₂SO4 find the weights of feed, mother liquor and loss of water by evaporation. 5, 1000kg of a solution containing 25% Na₂CO3 is slowly cooled at 20°C, During cooling 15% of water originally evaporates. What is the wt of Na₂CO310H₂O crystals formed. The solubility of Na₂CO3 at 20°C is 21.5 kg/100 kg of water. Drying 1. A batch of leather leaving a dryer weighs 1000 kg and contains 5% moisture. During drying the leather loses 50% of its original weight. Determine the following: i) The moisture content of the leather entering the dryer on a dry basis ii) The amount of moisture removed per kg of bone dry leather iii) Water removed as percent of the original water present 2. Wet paper containing 75% water is dried to remove 80% of water present. Determine the composition of the dried paper. 3. Wet lumber (5%moisture) is dried to 1% moisture in a hot air drier. Air fed to the drier contains 0.5% water. The moisture leaving the drier contains 2% (by wt) water. How much air is required to dry 2000kg/h of lumber.
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