crystallization-notes - Generation of a batch recipe for a...

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Generation of a batch recipe for a crystallization process and verification rough dynamic simulation through dynamic simulation Irene Papaeconomou & Rafiqul Gani The following tutorial contains the step st h r o u gh ICAS for obtaining the solid-liquid phase diagram, generating the batch recipe based on it and verifying the recipe through dynamic simulation set up in ICAS CAPEC, Department of Chemical Engineering, DTU, Lyngby, Denmark
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Application of the operational design algorithm for the generation of a batch recipe to separate NaCl nd KCl from a mixture with water and KCl from a mixture with water. • Problem Definition : A mixture of water, NaCl and KCl with a feed composition (on a 100 kg feed basis): water 80%, NaCl 15% and KCl 5% is to be separated. • Objective: To recover 95% of the dissolved sodium chloride (NaCl). • The operating range of temperature for the crystallizers is 0 o C to 100 o C.
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Given: Identities of the solvent and the solids omposition of the feed Algorithm for the operational modelling of batch crystallization Composition of the feed Temperature range Draw the solubility curves for the range of mperature on the ternary equilibrium diagram temperature on the ternary equilibrium diagram According to feed location on the ternary diagram and the specified product, check the feasibility of the precipitation of the solid i=1, …, N Identify the solid to precipitate and select the operation task (choose temperature, evaporation/dilution ratio (or mixing ratio) Solid crystallized: Compute the product yield Desired yield achieved? Solid/Liquid separation NO Treat Mother Liquor as new feed YES Solid/Liquid separation Above operation path is converted to the operational steps for a batch crystallizer
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How to produce a phase diagram with the elp of ICAS help of ICAS The first part of the algorithm is the generation of the phase diagram for the relevant system. Step 1 : Select the compounds for the specific problem. pp Choose the compounds from the salts database.
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General Note : Even though the main components are water, sodium-chloride and potassium-chloride, some extra compounds should be included in the component list, since they might precipitate at various temperatures. These extra compounds are the double salts of the two single salts and their hydrates (mono-, dihydrates). If these compounds are not included in the compound list, then even if they do precipitate at various temperatures, it won’t be possible to be identified. Step 2 : Select the thermodynamic model (use the default model for salts) Adjust the measure units to your problem. g for mass and o for temperature) (kg for mass and C for temperature) Step 3 : Draw the stream Doubleclicking on a feed stream brings up the mixture specification dialog box, where one defines the feed stream. The temperature and pressure are 100 o C and 1 atm, respectively. The composition of stream 1 is water, 80 kg/hr, NaCl 15 kg/hr and KCl 5 kg/hr.
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From the mixture specification dialog box, one can be directed to the thermodynamic property calculations window. There, a number of calculations
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crystallization-notes - Generation of a batch recipe for a...

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