Chemical Process Calculations Lecture series - Lecture 38 39 Energy Balance ( Crystallizer ) in Unit Operations Numerical

Th this lecture, Introduction to the concepts of crystallizer, mechanism of crystallization Numerical on crystallizer, DETERMINATION OF HEAT TRANSFER AREA NUMERICAL in crystallizer are solved. -------------- A Swenson-Walker crystallizer is used to crystallize Na2SO4*10H2O crystals at the rate of 1000 kg/h by cooling a saturated solution of Na2SO4 from 313 K to 290 K. Cooling water enters the unit at 285 K and leaves at 300 K. Evaporation is negligible. The solubilities of anhydrous Na2SO4 in water are 49 parts and 15 parts of Na2SO4 per 100 parts of free water at 313 K and 290 K respectively. The mean specific heat of liquor is 3.8 kJ/kg K and the heat of crystallization is -243 kJ/kg. For the crystallizer , the available heat transfer area is 3 m2/m length and the overall coefficient of heat transfer is 0.2 KW/m2K. How many sections of the crystallizer ,each 3 m long , will be required ? ---------------- FeSO4 7H2O crystals are produced in a Swenson-Walker crystallizer by cooling the saturated solution at 323 to 303 K. Solubility are 48 parts and 32.9 parts of FeSO4 per 100 parts of free water at at 323 K and 303 K respectively. The Feed solution has an average specific heat of 2.93 kJ/kg K. Heat of solution of FeSO4 7 H2O at 303 K is 18.4 kJ /mol How much heat is evolved during the process per kg of FeSO4 7H2O ---------------- A Swenson-Walker crystallizer is isto cool a 23 % solution of Na3PO4 from 40 OC to 25 OC. During cooling. Na3PO4 12 H2O is crystallized. It is desired to produce 225 kg of product/ hour. The solubilities of anhydrous Na3PO4 at 25 oC is 15.5 parts and 15 parts of anhydrous salt per 100 parts of total water. The mean specific heat of solution is 0.77 kcal/kg oC and the heat of crystallization for 1 kg of product is 35 kcal. The cooling H2O is to enter the crystallizer jacket at 15 oC and is to leave at 20 oC. The overall heat transfer coefficent (U) = 120 kcal/m2 h oC. What is the HT area of the crystallizer. --------------------- Numercal to determine Overall HEAT TRANSFER COEFFICIENT Answers are subject to verification by the learners. CPC/ Lecture 05 Conversion of units https://youtu.be/4EWmB9JVcBo CPC/ Lecture 06-08 Empirical Equations Conversion Temperature https://youtu.be/7X3LNoSydQc Lec 09-12 Concept of Mole, Molecular weight, and Density of solutions https://youtu.be/bYW70-nsfGc Lecture 13 Molecular Mass, Equivalent Mass, Mass to Mole conversions https://youtu.be/6YkZhlYgm30 Lecture 14 Mass density, specific gravity, API Gravity, Barrels of Oil equivalents https://youtu.be/5Clv3QDDSu8 Lecture 15 Mole Fraction Mass Fraction Composition of Mixtures in Mole and mass basis https://youtu.be/OD7HTMAcOAM Lecture 16 AVERAGE MOLECULAR WEIGHT Determination https://youtu.be/yh50gsKgeag Lecture 17 Ideal Gas law, Density of Gas mixtures, Average molecular weights https://youtu.be/FaMKXF_3nAM Lecture 18 Density of ideal gas mixtures https://youtu.be/_TQEF7F-swM https://youtu.be/_TQEF7F-swM Lecture 19 Average molecular weight - Revision Lecture https://youtu.be/ssnE8ZvvzEs Lecture 20 Material Balance Basic principles and MB without chemical reactions https://youtu.be/2g0thiOFofQ Lecture 21 Material Balance in Unit operations https://youtu.be/0x-ScIy0N2Y Lecture 22 Numerical on Unit Operations Evaporators and crystallizers https://youtu.be/gWFAvPEGxjo Lecture 23 Material Balance in Drying Unit: Numerical https://youtu.be/vb9nFlqE09o Lecture 24 Material Balance in Drying: Numerical https://youtu.be/8b00D2HH-a4 Lecture 25 Recycled air in Drying: Material Balance Numerical https://youtu.be/ttgdasq1uLo Lecture 26 Material Balance Numerical (Distillation Absorption Extraction Blending ) https://youtu.be/B-ciYT41t3o Lecture 27 Material Balance in Multiple Units Process Flow diagrams and Multiple Unit MB Numerical https://youtu.be/2piqq64fmMQ Lecture 28 Material Balance in Multiple Units Numericals https://youtu.be/uihmOBpFTKI Lecture 29 Material Balance with Chemical Reactions https://youtu.be/JNiv8ScsJ_E Lecture 30 Numerical Material Balance with Chemical Reactions Part-01 https://youtu.be/lwFzLn5zoI0 Lecture 31 and 32 Numerical on Material Balance with Chemical Reactions Part-02 https://youtu.be/DzveRZxoT6g Lecture 33 and 34 Numerical on Material Balance with Chemical Reactions Part-03 https://youtu.be/r-6qmUvj_ew Lecture 35 Introduction to Energy balance part-I https://youtu.be/B-Ib-VI2rQo Lecture 36 Energy Balance in Evaporators & Crystallizer https://youtu.be/dR7ZjfFZ2Zs Lecture 37 Energy Balance in Unit Operations Numerical (Evaporators Crystallizer) https://youtu.be/XQsirk-85EM Lecture 38 39 Energy Balance (Crystallizer ) in Unit Operations Numerical https://youtu.be/OGK-UPzBKFs Lecture 49 Psychrometric chart and Air conditioning systems (Humidification and dehumidification) https://youtu.be/YgEYhE8bxxU Lecture No. 50 Numerical on Psychrometric chart for Humidification and dehumidification https://youtu.be/akJx77ktfqs