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|Title: ||Systematic design of supersaturation controlled crystallisation processes|
|Authors: ||Aamir, Erum|
Nagy, Zoltan K.
Rielly, Chris D.
|Issue Date: ||2008|
|Publisher: ||© The authors|
|Citation: ||AAMIR, E., NAGY, Z.K and RIELLY, C.D, 2008. Systematic design of supersaturation controlled crystallisation processes. AIChE 2008 : Annual Meeting of American Institute of Chemical Engineering, Philadelphia, PA, USA|
|Abstract: ||The paper presents a novel methodology for the systematic design of the setpoint operating
curves for supersaturation controlled crystallization processes, which produce a desired
target crystal size distribution (CSD). The population balance model is solved using the
method of characteristics under the assumptions of constant supersaturation and growth
dominated process, yielding a simplified analytical expression for the size distribution. A
design parameter for supersaturation controlled processes is introduced as a function of the
supersaturation and time. Based on the design parameter and the simplified analytical model,
the supersaturation setpoint and batch time are determined using an optimization approach to
obtain a target distribution with a desired shape. A methodology is also described, which can
be used to obtain the temperature profiles in the time domain, corresponding to a desired
target CSD, providing a systematic direct design approach for practical applications and
scale-up. Additionally, a method for designing the seed distribution is proposed, which can be
used in conjunction with the supersaturation setpoint design, for shaping the product CSD.
The proposed methods are exemplified for the model system of potash alum in water, for
which the size dependent growth kinetic parameters have been identified based on industrial
|Description: ||This conference paper was delivered at AIChE 2008: http://www.aiche.org/Conferences/AnnualMeeting/annual2008.aspx|
|Appears in Collections:||Conference Papers and Presentations (Chemical Engineering)|
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