Influence of hydrostatic pressure and gas content on continuous ultrasound emulsification

Behrend, Olaf; Schubert, Helmar

doi:10.1016/s1350-4177(01)00088-8

Cited by 94 publications

(41 citation statements)

References 11 publications

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“…In multistage processes the emulsion has to pass the cell and the ultrasonic sonotrodes more than one time. Due to the small product throughput, the ultrasonic emulsification process is mainly applied in laboratories where mean droplet diameters between 0.25 lm [23] to 0.2 lm [24] can be obtained. In such a process the product stress is very high.…”

Section: Overview Of Emulsification Systemsmentioning

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: Overview Of Emulsification Systemsmentioning

confidence: 99%

Rotor‐Stator and Disc Systems for Emulsification Processes

Urban

Wagner²,

Schaffner³

et al. 2006

Chem Eng & Technol

113

View full text Add to dashboard Cite

show abstract

“…Mechanical emulsification can be carried out using high-pressure homogenizers, rotor-stator systems, ultrasound homogenizers [1] and novel microporous emulsification systems based on a microporous membrane of different structure [2] or regular-sized silicon microchannels fabricated by semiconductor technology [3]. In a microporous emulsification system, small droplets are directly formed by the permeation of dispersed phase through the uniform micro -pores or -channels into moving continuous phase.…”

Section: Introductionmentioning

confidence: 99%

Production of O/W emulsions using SPG membranes, ceramic α-aluminium oxide membranes, microfluidizer and a silicon microchannel plate—a comparative study

Vladisavljević

Lambrich

Nakajima

et al. 2004

Colloids and Surfaces A: Physicochemical and Engineering Aspect

115

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“…[19][20][21] The effect of the sludge/water ratio on oil removal is shown in Figure 6. Oil removal increased from 12.3% to 46.8% when the sludge/water ratio was decreased from 1:0.5 to 1:2.…”

Section: Effect Of Sludge/water Ratio On Oily Sludge Washingmentioning

confidence: 99%

Influence of ultrasonic waves on the removal of different oil components from oily sludge

Gao

Ding

Wu³

et al. 2015

Environmental Technology

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(2015) Influence of ultrasonic waves on the removal of different oil components from oily sludge, Environmental Technology, 36:14, 1771-1775, DOI: 10.1080/09593330.2015 Ultrasonic technology is a promising tool for washing oily sludge to recover oil. In this study, the influence of ultrasonic conditions on the removal of different oil components from oily sludge was investigated to optimize ultrasonic washing technology. Among the three frequencies (25, 50 and 100 kHz) applied, ultrasonic washing at 25 kHz exhibited the best performance in terms of oil extraction rate and efficiency. An ultrasonic intensity of 0.33 W/cm 2 was necessary to overcome the energy threshold for oil washing. Application of a standing wave or dual frequencies did not improve the oil removal performance perceptibly. The optimum conditions for the removal of oil from oily sludge were an ultrasonic frequency of 25 kHz, intensity of 0.33 W/cm 2 and sludge/water ratio of 1/2 (in volume). Thin-layer chromatographic flame ionization detection showed that ultrasonication could overcome high energy thresholds, resulting in an increase in the removal of asphaltenes and resins, with the removal of asphaltenes particularly affected by frequency. This study could provide valuable information for the application of ultrasonic technology in oily sludge treatment.

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Influence of hydrostatic pressure and gas content on continuous ultrasound emulsification

Cited by 94 publications

References 11 publications

Rotor‐Stator and Disc Systems for Emulsification Processes

Rotor‐Stator and Disc Systems for Emulsification Processes

Production of O/W emulsions using SPG membranes, ceramic α-aluminium oxide membranes, microfluidizer and a silicon microchannel plate—a comparative study

Influence of ultrasonic waves on the removal of different oil components from oily sludge

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