Wärme‐ und Stoffaustausch bei der Kristallisation an gekühlten Flächen. Teil I: Versuchsanordnung und Ergebnisse bei ruhenden wäßrigen Lösungen

Wintermantel, Klaus; Käst, W.

doi:10.1002/cite.330450511

Chemie Ingenieur Technik

1973

DOI: 10.1002/cite.330450511

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Wärme‐ und Stoffaustausch bei der Kristallisation an gekühlten Flächen. Teil I: Versuchsanordnung und Ergebnisse bei ruhenden wäßrigen Lösungen

Klaus Wintermantel¹,

W. Käst²

Abstract: 1) Den ersten Schritt der Trennung stellt die dreidimensionaleKeimbildung dar. Bei der Kristallisation an gekuhlten Flachen beeinflul3t sie jedoch den Ablauf des eigentlichen Trennpro-Z~S S B S nur unwesentlich und wird daher nicht naher behandelt. 2) Erliiuterung der Formelzeichen am Schlul3 der Arbeit.

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Cited by 11 publications

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Crystallization and Precipitation: The Optimal Supersaturation

Mersmann

Löffelmann²

2000

Chem. Eng. Technol.

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In this article the optimal supersaturation for cooling and evaporation crystallization are presented. This information is based on a simplified model which describes the metastable zone width of activated nucleation. The model assumes that the nucleation step is very fast and the occurrence of the shower of nuclei which is used to define the metastable zone width is caused by the growth of activated nuclei. In future new sensors for the measurement of supersaturation will help to operate batch crystallizers at the optimal supersaturation during the entire batch time.

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Crystallization and Precipitation: The Optimal Supersaturation

Mersmann

Löffelmann²

2000

Chem. Eng. Technol.

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Solvent‐Aided Layer Crystallization of Glycerol – Post‐Treatment and the Influence of Agitation

Eisenbart

Ulrich

2016

Chem Eng & Technol

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The purification of glycerol from water by melt layer crystallization with an additional solvent to influence the crystallization kinetics is investigated. Static cold finger experiments including a sweating‐like post‐treatment were carried out. A simple seeding technique is introduced to facilitate layer crystallization without primary nucleation or agitation. It is shown that the glycerol crystal layers tend to burst in a traditional sweating procedure, but a modified temperature profile allows a post‐treatment with a similar effect. The solvent improved the separation efficiency of the growth step and also the one of the sweating step. Therefore, its effect does not only result from its influence on forced convection but also that on natural convection and diffusion.

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Density of desublimed layers

1987

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Starting from the assumption that the growth of desublimed layers is governed mainly by heat and mass transfer, the authors present a model based on conditions in the diffusion boundary layer and suggest that the “hoarfrost” density depends on only one parameter. The discussion accounts for the process determining factors, i.e. the growth rate, mass transfer and gas concentration. The theoretical relationship is confirmed by the authors' own experiments on two systems and data from literature. The relationship can be established by a few laboratory experiments and permits the calculation of frost density and of associated variables, thus facilitating the optimization of desublimator design.

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Wärme‐ und Stoffaustausch bei der Kristallisation an gekühlten Flächen. Teil I: Versuchsanordnung und Ergebnisse bei ruhenden wäßrigen Lösungen

Cited by 11 publications

References 13 publications

Crystallization and Precipitation: The Optimal Supersaturation

Crystallization and Precipitation: The Optimal Supersaturation

Solvent‐Aided Layer Crystallization of Glycerol – Post‐Treatment and the Influence of Agitation

Density of desublimed layers

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