Control of the Crystal Mean Size in a Pilot Plant Potash Crystallizer

Redman, Terry P.; Rohani, Sohrab; Strathdee, Graeme

doi:10.1205/026387697523435

Cited by 16 publications

(8 citation statements)

References 18 publications

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“…29 A small number of studies have shown the use of FBRM as a control tool as well. Redman et al 30 used Par-Tec 100 sensor for fines dissolution using an external heating loop and feedback control. The first approach that uses FBRM for real time feedback control and in situ fines removal, the direct nucleation control (DNC) approach, was introduced by Abu Bakar et al 31 It was shown for glycine crystallization that better results in terms of larger, more uniform crystals can be obtained in the case of cooling, anti-solvent and combined cooling and anti-solvent crystallization compared to simple linear cooling operation.…”

Section: Introductionmentioning

confidence: 99%

Automated direct nucleation control for in situ dynamic fines removal in batch cooling crystallization

2012

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Section: Introductionmentioning

confidence: 99%

Automated direct nucleation control for in situ dynamic fines removal in batch cooling crystallization

2012

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“…The FBRM output can be related to changes in particle shape, solids concentration and rheological behaviour of¯uid suspensions [5]. Overall, the FBRM probe is ideal for industrial utilisation as a quality and process control device, providing rapid and accurate data accumulation, with the collected information requiring minimal attention from the plant operators [6,7]. Work published to date on the FBRM system has attempted to either directly relate the measured chord length data to the particle size data [3,4] or, more successfully, to simply correlate it to properties dependent on particle size [5,7,8].…”

Section: Introductionmentioning

confidence: 99%

In-line FBRM Monitoring of Particle Size in Dilute Agitated Suspensions

Barrett

Glennon

1999

Part. Part. Syst. Charact.

131

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The use of laser light scattering technology, as applied by the Focused Beam Re¯ectance Measurement (FBRM) probe from Lasentec, for the in-line monitoring of particle size was investigated. In particular, the effects of probe position and orientation were studied for a dilute agitated aqueous particulate suspension of known particle size distribution in a number of vessels. In all cases, the normalised chord length distribution recorded with the FBRM system was consistent with the theoretically predicted distribution. However, the total number of counts measured was a function both of solids concentration and probe location. Optimum probe location is dependent on the ease with which the solid phase can be suspended with the available agitation system and on the associated dominant¯ow direction within the vessel.

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“…This approach can measure CSD information even for dense crystal slurries. One of the first commercial instruments of this type, the Par-Tec 100 analyzer, has been used to estimate kinetic parameters for the crystallization of adipic acid in water (Monnier et al 1996) as well as in feedback control (Redman et al 1997). Several publications describe applications of updated versions of the instrument, referred to as Lasentec Focused Beam Reflectance Measurement (FBRM) (Farrell & Tsai 1995;Barrett & Glennon 1999;Ma et al 1999;Tahti et al 1999;Togkalidou et al 2001), which are rugged enough to be implemented on industrial crystallizers.…”

Section: Crystal Size Distribution (Csd)mentioning

confidence: 99%

Crystallization: Key thermodynamic, kinetic and hydrodynamic aspects

Vedantam

Ranade

2013

Sadhana

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Crystallization is extensively used in different industrial applications, including the production of a wide range of materials such as fertilizers, detergents, food and pharmaceutical products, as well as in the mineral processing industries and treatment of waste effluents. In spite of the widespread use of crystallization, a clear understanding of the thermodynamic, kinetic and hydrodynamic aspects of the design methodologies are not yet well established. More often than not crystallization is still considered an art especially in fine-chemicals, pharmaceuticals and life-sciences sector. It is essential to understand and relate key thermodynamic, kinetic and hydrodynamic aspects to crystallizer performance, not just in terms of yield but also in terms of product quality (characterized by particle size distribution, morphology, polymorphism and the amount of strain as well as the uptake of solvent or impurities in the crystal lattice). This paper attempts to do that by critically reviewing published experimental and modelling studies on establishing and enhancing state-of-the-art thermodynamic, kinetic and hydrodynamic aspects of crystallization. Efforts are made to discuss and raise points for emerging modelling tools needed for a flexible design and operation of crystallizers and crystallization processes that are needed to meet the ever increasing demand on precise product specifications. Focus is on bringing out the trends which can be used as perspectives for future studies in this field.

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Control of the Crystal Mean Size in a Pilot Plant Potash Crystallizer

Cited by 16 publications

References 18 publications

Automated direct nucleation control for in situ dynamic fines removal in batch cooling crystallization

Automated direct nucleation control for in situ dynamic fines removal in batch cooling crystallization

In-line FBRM Monitoring of Particle Size in Dilute Agitated Suspensions

Crystallization: Key thermodynamic, kinetic and hydrodynamic aspects

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