Graduate Thesis Or Dissertation
 

Dynamics and control of continuous crystallizers

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/7d278x120

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  • The theoretical analysis of an unseeded, isothermal mixed-suspension mixed-product-removal (MSMPR) crystallizer with a fines trap is developed. The lumped parameter system equations are presented for a homogeneous nucleation and a number-dependent secondary-nucleation model. Linear stability analysis and system simulations are used to investigate the system's dynamic behavior. Modal control algorithms for the above systems are developed using throughput rate or fines-recirculation rate or both as the manipulated variables. The system performance is significantly improved when modal control is applied whether the system is stable or unstable. The characteristic equation for size-dependent growth rate in an MSMPR crystallizer is found by linear stability analysis. The case in which the growth rate is size-dependent for small crystals and size-independent for large crystals; and the case in which the growth rate is given by the Abegg - Stevens - Larson (ASL) equation are solved to illustrate the effect of size-dependent growth rate on stability. A new on-line probe was developed to measure the particle size distribution. Its theory, limitations (it is useful for large particles) and applicability are discussed.
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