Kontinuierliches Emulgieren mit Rotor/Stator‐Maschinen: Einfluß der volumenbezogenen Dispergierleistung und der Verweilzeit auf die Emulsionsfeinheit

Koglin, Bernd; Pawlowski, J.; Schnöring, Hildegard

doi:10.1002/cite.330530813

Cited by 43 publications

(13 citation statements)

References 4 publications

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“…Further detailed investigations for the production of emulsions in gear-rim dispersing machines can also be found in the publications of Wiedemann [32], Koglin et al [33], Osterhaus [34], Karbstein [4], and Tesch [7].…”

Section: Colloid Millsmentioning

confidence: 99%

Rotor‐Stator and Disc Systems for Emulsification Processes

Urban

Wagner²,

Schaffner³

et al. 2006

Chem Eng & Technol

113

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Emulsions now find a wide range of applications in industry and daily life. In the pharmaceutical industry lipophilic active ingredients as well as many nutritional products such as vitamins are often formulated in the dispersed phase of oil-in-water emulsions. Emulsions can be produced with different mechanical emulsification techniques. In the following review, the process of rotor-stator systems and disc systems are compared to other popular mechanical emulsification systems. On the basis of experimental results from the authors' laboratory, a discontinuous gear-rim dispersing system, discontinuous disc system, and a continuous high pressure system are compared with regard to their attainable mean droplet diameter and drop size distribution in an oil-in-water emulsion. It can be shown that dissolver discs with a very simple geometry attain very small mean droplet diameters and a very narrow droplet size distribution, comparable to the emulsions obtained with established rotorstator systems such as gear-rim dispersers.

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Section: Colloid Millsmentioning

confidence: 99%

Rotor‐Stator and Disc Systems for Emulsification Processes

Urban

Wagner²,

Schaffner³

et al. 2006

Chem Eng & Technol

113

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“…Um diese Tatsache naher zu untersuchen und um Voraussagen bzgl. des Venveilzeiteinflusses treffen zu konnen, wurden die Versuchsergebnisse ahnlich wie in [7] aufbereitet.…”

Section: Theoretische Fierlegungen Zum Tropfenaufbruchunclassified

“…Es wurden folgende dimensionslose KenngroRen gebildet: dimensionsloser Tropfendurchmesser D aus (6) D 0 ( E * ) 1 / 4 p;IE ll;314 (7) Batchversuche mit: 0 = Tropfendurchmesser dimensionslose Zeit T GemaR W A L S T R A [8] kann die Tropfenaufbruchszeit gemaB folgender Beziehung grob abgeschatzt werden: Fur turbulente Vermischungsvorgange ist aus der Ruhrtechnik [9] folgende Abhangigkeit bekannt: tM x g;l pc v 2 (10) t = Beschallungszeit tM = Mischzeit V = Volumen des Beschallungsraumes Diese ijbertragung ist naheliegend, da durch den Schallstrahlungsdruck im Beschallungsraum ahnlich wie in einem Ruhrkessel groR raumige Zirkulationsstromungen induziert werden (s. Abb. 12).…”

Section: Theoretische Fierlegungen Zum Tropfenaufbruchunclassified

Grundlagenuntersuchungen zur Herstellung von Öl/Wasser‐Emulsionen im Ultraschallfeld

Bechtel

Gilbert

Wagner

1999

Chemie Ingenieur Technik

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Basic Research on Ultrasonic Production of Oil‐in‐Water‐Emulsions This article presents basic research results for production of oil in water emulsions under ultrasonic irradiation. A new theoretical model supports experimental work. Special attention is given to the transfer of batch experiments to continuous emulsification processes. Our experimental findings prove that final drop size essentially depends on specific power density. Drop size decreases with increasing residence time in the ultrasonic field until a system specific, minimum drop size is obtained. Ultrasonic irradiation leads to turbulent flow conditions on a macroscopic and a microscopic scale. Our model based on the theory of turbulent drop break up predicts drop size and can be used to design equipment for ultrasonic emulsification.

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“…Therefore, often the energy density E V is used to describe both influences on droplet breakup, the one of the stresses and the one of the time interval in which stresses act on droplets. It describes the mean energy introduced into the emulsion volume and can be calculated from the mean volume‐based power density $ \overline {{P_{\rm{V}}}} $ and the mean residence time $ \overline {{t_{\rm{V}}}} $ 4, 5: …”

Section: Introductionmentioning

confidence: 99%

Influence of Flow Conditions in High‐Pressure Orifices on Droplet Disruption of Oil‐in‐Water Emulsions

2014

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Flow conditions in and behind high‐pressure orifices are described by a characteristic correlation between discharge coefficient and Reynolds number. The use of a pressure vessel and variations in viscosity allowed for non‐pulsating flow conditions from laminar to turbulent flow. Emulsions were homogenized under each condition. A considerable difference was observed in the final droplet size distribution depending on laminar, transitional, and turbulent flow. When the flow was pulsating as found when applying a plungers pump, transition of the flow from laminar to turbulence was more difficult to detect. Emulsions homogenized under these conditions indicated broader droplet size distributions. The Sauter mean diameter, however, was not affected by the pulsating flow.

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Kontinuierliches Emulgieren mit Rotor/Stator‐Maschinen: Einfluß der volumenbezogenen Dispergierleistung und der Verweilzeit auf die Emulsionsfeinheit

Abstract: Bekannte EinfluRgroBen auf die Emulsionsfeinheit

Cited by 43 publications

References 4 publications

Rotor‐Stator and Disc Systems for Emulsification Processes

Rotor‐Stator and Disc Systems for Emulsification Processes

Grundlagenuntersuchungen zur Herstellung von Öl/Wasser‐Emulsionen im Ultraschallfeld

Influence of Flow Conditions in High‐Pressure Orifices on Droplet Disruption of Oil‐in‐Water Emulsions

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