Design of Crystallization Equipment

Saeman, W. C.

doi:10.1021/ie50620a019

Cited by 20 publications

(1 citation statement)

References 4 publications

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“…Author: The steady-state operation of MSMPR crystallizers has been studied by many researchers, − but transient behavior often provides kinetic information beyond steady-state analyses. , In the context of MSMPR crystallizations, Chambliss, Timm, and Randolph and Larson studied crystallization of alum, ammonium sulfate, and NaCl after a step change in feed rate. In a companion paper, we developed a coupled species balance and population balance model , for MSMPR crystallizers, solved for the steady-state CSD, and linearized the model to account for deviations from the steady state.…”

Section: Introductionmentioning

confidence: 99%

Crystallization with Sinusoidal Modulation of Stirrer Speed: Frequency Response Analysis and Secondary Nucleation Kinetics

Bal

Peters

2020

Crystal Growth & Design

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In crystallization, obtaining the proper nucleation and growth parameters is essential to the design of crystallization processes. This paper studies the response of crystal size distribution (CSD) to periodic oscillations in the stirrer speed within a mixed suspension mixed product removal (MSMPR) crystallizer. We start from a model in which all processes are coupled. Stirrer speed oscillations drive oscillations in the secondary nucleation kinetics. Oscillations in the nucleation rate drive damped waves in the population distribution of growing crystals. Changes in the population of crystals drive changes in the supersaturation. Supersaturation along with the total mass of crystals influences the nucleation rate. At low frequencies, including the pseudosteady-state limit, effects of a change in stirring rate are attenuated by the coupling to other processes. At high frequencies, stirring rate oscillations lead to pronounced waves in the CSD that might facilitate studies of secondary nucleation.

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Section: Introductionmentioning

confidence: 99%

Crystallization with Sinusoidal Modulation of Stirrer Speed: Frequency Response Analysis and Secondary Nucleation Kinetics

Bal

Peters

2020

Crystal Growth & Design

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Transient and steady state size distributions in continuous mixed suspension crystallizers

1962

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The mixed suspension, mixed product removal crystallizer as a concept in crystallizer design

Randolph¹

1965

AIChE Journal

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Numerals0 = mid axis origin 1 2 1 h = experimental = initial condition or upper phase = final condition or lower phase LITERATURE CITED 1. Cockbain, E. G., and T. S. McRoberts, J. Colloid Sci., 8, 440 ( 1953). Simultaneous population and mass balances have been solved together with a generalizedform of nucleation-growth rate kinetics to obtain the form of crystal size distribution (CSD)for several idealized modes of crystallizer operation, including seed crystal removal, product classification, arbitrary solids concentration, and staged vessels. The effect of holding time and feed supersaturation on crystal size in a mixed suspension, mixed product removal (MSMPR) crystallizer was also studied. A representative CSD from an MSMPR crystallizer plus the relative kinetic order of nucleation to growth rate can be used to predict CSD from any of the above modes of operation.Crystal size distribution (CSD) is one of the most important and troublesome properties of an operating crystallizer and is a property which cannot presently be designed without prior experience with the crystal system and the type of crystallizer used. Saeman (I), in a classical con-A notable addition to the recent literature is a paper by Bennett (7) which tabulates experimental CSD data from a large class of crystallizers and crystal systems. A property of any CSD is the so-called coeficient of variation (C.V.)," or relative size spread over which the majority +a Not to be confused with coefficient of velocity, also referred to as

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Design of Crystallization Equipment

Cited by 20 publications

References 4 publications

Crystallization with Sinusoidal Modulation of Stirrer Speed: Frequency Response Analysis and Secondary Nucleation Kinetics

Crystallization with Sinusoidal Modulation of Stirrer Speed: Frequency Response Analysis and Secondary Nucleation Kinetics

Transient and steady state size distributions in continuous mixed suspension crystallizers

The mixed suspension, mixed product removal crystallizer as a concept in crystallizer design

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