Crystallization Technology Handbook

Mersmann, Alfons

doi:10.1080/07373939508917003

Cited by 312 publications

(520 citation statements)

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“…The temperature of the solution in the crystallizer was 45°C. In order to increase the mixing capacity, a W form bottom was used [6]. The mixing was performed by a 3-blade marine propeller.…”

Section: Methodsmentioning

confidence: 99%

“…The exponent m=1.4 is estimated. According to the literature, a value of m close to 1 suggests that the main source of secondary nucleation is due to a crystal-propeller contact mechanism whereas a value close to 2 indicates a crystal-crystal contact mechanism [6,13]. The value m=1.…”

Section: Influence Of the Solid Concentration In Suspension On The Sementioning

confidence: 99%

“…It is well known that the crystallization kinetics depends on the flow in the reactor [6,20,22,24]. However, the flow parameter that drives the secondary nucleation rate is usually difficult to define.…”

Section: Influence Of the Flow On The Secondary Nucleation Ratementioning

confidence: 99%

“…A generic value of the power number for the 3-pale marine propellers is N p =0.35 [6]. This value can only be considered as being a good order of magnitude, as it does not take into account the presence of the draft tube.…”

Section: Influence Of the Flow On The Secondary Nucleation Ratementioning

confidence: 99%

“…Most of authors showed that the contact secondary nucleation rate is proportional to a power of the volumetric hold-up of the crystals [12][13][14]. Moreover, when a stirrer rotates in a suspension, the nucleation is proportional to a power of the power provided by the stirrer to the suspension as well [6,15].…”

Section: Secondary Nucleation Rate Expressionmentioning

confidence: 99%

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Influence of mixing and solid concentration on sodium bicarbonate secondary nucleation rate in stirred tank

Wylock¹,

Gutierrez

Debaste

et al. 2010

Cryst. Res. Technol.

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This work aims to investigate the influence of the solid concentration in suspension on the contact secondary nucleation rate of sodium bicarbonate crystallization in a stirred tank crystallizer and to show the necessity of a local description of the mixing for a nucleation rate influence study. Experiments and computational fluid dynamics (CFD) simulations are realized. Crystallization kinetic parameters are extracted from experimental data using a mass distribution fitting approach. CFD and the experimental results allow identifying that a mixing property correlated with the measurements of the secondary nucleation rate in the stirred tank crystallizer appears to be the turbulent dissipation rate on the edge of the impeller. Its influence and the influence of the solid concentration in the suspension on the secondary nucleation rate are estimated by the evaluation of their exponents in a kinetic law. The obtained exponent values are then discussed qualitatively.

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Section: Methodsmentioning

confidence: 99%

Section: Influence Of the Solid Concentration In Suspension On The Sementioning

confidence: 99%

Section: Influence Of the Flow On The Secondary Nucleation Ratementioning

confidence: 99%

Section: Influence Of the Flow On The Secondary Nucleation Ratementioning

confidence: 99%

Section: Secondary Nucleation Rate Expressionmentioning

confidence: 99%

See 3 more Smart Citations

Influence of mixing and solid concentration on sodium bicarbonate secondary nucleation rate in stirred tank

Wylock¹,

Gutierrez

Debaste

et al. 2010

Cryst. Res. Technol.

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Organic Nanoparticles in the Aqueous Phase—Theory, Experiment, and Use

Horn

Rieger

2001

Angew. Chem. Int. Ed.

962

659

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Many active organic compounds and organic effect materials are poorly soluble in water, or even insoluble. Aqueous forms of application thus require special formulation techniques to utilize or optimize the physiological (pharmaceuticals, cosmetics, plant protection, nutrition) or technical (varnishes, printing inks, toners) action. The most interesting properties of nanodispersions of active organic compounds and effect materials include the impressive increase in solubility, the improvement in biological resorption, and the modification of optical, electrooptical, and other physical properties which are achievable only with particle sizes in the middle or lower nanometer range (50–500 nm). Hence in addition to economic and ecological constraints there are also technical demands which appear to urgently require the development of new processes for the production of organic nanoparticles as alternatives to the established mechanical milling processes. In this context attention is drawn to the recent increase in research activities which have as their objective the continuous, automatic preparation of nanodispersed systems by precipitation from molecular solution. In this review the current state of knowledge of the fundamentals of particle formation from homogeneous solution and the effect of solvent and polymer additives on the morphology and supramolecular structure of the nanoparticle will be discussed. The practical implementation of this new formulation technology will be explored in detail for the carotenoids, a class of compounds of both physiological and technical interest.

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The Relevance of Interactions in Nanoparticle Systems – Application to Particulate Thin Films

GüNTHER

2002

Part. Part. Syst. Charact.

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In the field of Particle Technology, processes cannot yet be designed from basic molecular understanding. Nanotechnology, however, begins to bridge this gap between molecules and particles and may thus open up new ways not only for the production and handling of particulate matter but also for the engineered design of advanced material properties. The visions and applications in nanoparticle technology cover a broad range, for instance quantum dots in information technology, refractory particles for advanced ceramics, highly active substances in pharmacy, catalysts or micro‐ and mesoporous adsorbents, to name only a few applications. Starting from the concept of product engineering, we investigate the basic preconditions for tailoring nanoparticulate properties, i.e. the control of the particle interactions. This concept is then applied to particulate thin film formation as an example of structure formation. The structure of dip‐coated samples, defined as the order of particles within the layer, was found to vary with the pH and the ion concentration adjusted in the sol bath. It was observed that the surface roughness scanned by an atomic force microscope increased with increasing electrolyte concentration. The structural evolution of the particulate network was studied by measuring the viscosity as a function of shear rate and solid concentration. Finally, the influence of coating structures on the transmission properties was determined. Especially in the case of LaCl3 a strong dependence was observed. The results explicitly confirm a correlation between microscopic structure and macroscopic properties.

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Crystallization Technology Handbook

Cited by 312 publications

References 0 publications

Influence of mixing and solid concentration on sodium bicarbonate secondary nucleation rate in stirred tank

Influence of mixing and solid concentration on sodium bicarbonate secondary nucleation rate in stirred tank

Organic Nanoparticles in the Aqueous Phase—Theory, Experiment, and Use

The Relevance of Interactions in Nanoparticle Systems – Application to Particulate Thin Films

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