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Simulation and experimental evaluation of seed and supersaturation control design approaches for crystallisation processes
conference contributionposted on 16.01.2013 by Erum Aamir, Zoltan Nagy, Chris Rielly
Any type of content contributed to an academic conference, such as papers, presentations, lectures or proceedings.
The paper presents a methodology for the systematic design of operating recipes for batch cooling crystallisation systems with the aim to produce a desired target crystal size distribution. The population balance model is solved using the method of characteristics under the assumptions of a constant supersaturation and growth dominated process, yielding a simplified analytical expression for the size distribution. A method is proposed for designing the seed distribution, which can be used in conjunction with the supersaturation set-point design to shape the product crystal size distribution (CSD). The approach designs the seed as a mixture of crystals obtained from standard sieve analysis. A second approach is also proposed which uses dynamic seed addition during the batch to control the final size distribution.
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