Rotor‐Stator and Disc Systems for Emulsification Processes

Urban, Kai; Wagner, Gerhard; Schaffner, David; Röglin, Danny; Ulrich, Joachim

doi:10.1002/ceat.200500304

Cited by 109 publications

(58 citation statements)

References 19 publications

(12 reference statements)

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“…It has to be stable enough to prevent from coalescence and destabilization in course of polymerization. Different continuous processes are available to create liquid-liquid dispersion including membrane [13], rotor-stator [14], static mixer [15][16][17], colloid mills [14,18], high pressure homogenizer [19], mixer-settler [20] and pulsed column [21,22]. A remarkable feature of continuous liquid-liquid dispersion processes are their ability to create quickly droplet of controlled size.…”

Section: Introductionmentioning

confidence: 99%

Liquid–liquid dispersion in a continuous oscillatory baffled reactor – Application to suspension polymerization

Lobry

Lasuye²,

Gourdon

et al. 2015

Chemical Engineering Journal

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible.Liquid-liquid dispersion in a continuous oscillatory baffled reactor -Application to suspension polymerization b s t r a c tReducing energy costs, improving safety, minimizing waste are the current aims of chemical engineering. Process intensification in fine chemistry has been extensively studied but less work refers to heterogeneous reactions involving two liquid phases. This paper focuses on batch to continuous suspension polymerization transposition and especially on the liquid-liquid dispersion step. The main features of suspension polymerization reaction are based on (i) the initial liquid-liquid dispersion requiring a controlled size and narrow distribution and (ii) on the control of the final particle size during the agglomeration step by avoiding fouling which is a bottleneck for continuous flow. For the continuous transposition, liquid-liquid dispersion and reaction studies are carried out in continuous oscillatory baffled reactor (COBR) which is a multipurpose reactor. Its suitability to overcome the bottlenecks is demonstrated through the investigation of the oscillating and flow conditions or the dispersed phase holdup. A controlled droplet size distribution can be achieved. Oscillation is the main parameter responsible for droplet breakage. The suitable conditions to obtain stable dispersion are determined. For one of the first times, COBR is used for suspension polymerization.

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Section: Introductionmentioning

confidence: 99%

Liquid–liquid dispersion in a continuous oscillatory baffled reactor – Application to suspension polymerization

Lobry

Lasuye²,

Gourdon

et al. 2015

Chemical Engineering Journal

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“…The parameters of emulsification, such as shear velocity, homogenization pressure and number of passes through the homogenization unit, in the preparation of microcapsules can influence further steps of preparation of encapsulated oil containing ≥40 % DHA as a health care product (15,16). Therefore, in this study, the optimal operating conditions were investigated.…”

Section: Emulsion Preparationmentioning

confidence: 99%

Microencapsulation of Docosahexaenoic Acid Algal Oil Using Spray Drying Technology

Shao¹,

Pan²,

Liu³

et al. 2018

Food Technol. Biotechnol.

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SUMMARYThis work aims at developing a process of microencapsulation of algal oil containing ≥40 % docosahexaenoic acid (DHA) using spray drying technology. Purity Gum® 2000 and Capsul®, both obtained from waxy corn starch, were chosen as the encapsulation materials. The effects of emulsification conditions on the droplet size, stability, viscosity and surface tension, and the effects of spraying conditions on the particle size, moisture content and surface oil content were investigated successively. The morphology of emulsion droplets and the microcapsules was observed by optical microscope and scanning electron micro scopy. The results showed that the produced spherical microcapsules were smooth and free of pores, cracks, and surface indentation when shear velocity was 8.63 m/s in the first step of emulsification, homogenization pressure was 1.75·108 Pa and number of passes through homogenization unit was six for fine emulsification, rotational speed of spray disk was 400 s -1 , and air inlet temperature was 170 °C. Therefore, it was concluded that the emulsification and encapsulation of algal oil containing DHA with above process was feasible.

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“…Increasing the viscosity of the dispersed phase might increase the droplet size [56]. The correlation function between mean droplet diameter (d) and viscosity of dispersed phase (η d ) is [81,82]:…”

Section: Physicochemical Properties Of the Emulsion Systemmentioning

confidence: 99%

Improving Product Quality with Entrapped Stable Emulsions: From Theory to Industrial Application

Panagiotou

Fisher

2012

Challenges

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Entrapment of sub-micron scale emulsions containing active ingredients into macro-scale matrices has exhibited great potential as a delivery vehicle with controlled release capabilities, however optimization remains unrealized. Reported here are methods used to improve product quality by optimizing the emulsion formation steps. These methods are in conjunction with the precepts of Process Intensification (PI). Success with pharmaceutics and chemical reacting systems provides a strategy for a wide range of applications; the emphasis here being nutraceutics. Use of a nano-technology platform assists in: (a) product quality improvements through better nutrient dispersion, and thus bio-efficacy; and (b) production efficiencies through implementation of PI concepts. A continuous methodology, utilizing these PI concepts, that approximates a bottom-up approach to the creation of sub-micron and nano-emulsions is the basis of the technology presented here. Note that solid particles may result during post-processing. The metrics of successful processing include obtainment of nano-scale species with minimal input energy, reduced processing steps at higher throughput rates, and improved quality without over-usage of key ingredients. In addition to flavor and wellness characteristics, product stability for extended shelf life along with an appreciable cargo load in the entrapped emulsion is a major concern. Experimental protocols and path forward recommendations to overcome challenges and meet expectations in these emerging opportunities are also presented.

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Rotor‐Stator and Disc Systems for Emulsification Processes

Cited by 109 publications

References 19 publications

Liquid–liquid dispersion in a continuous oscillatory baffled reactor – Application to suspension polymerization

Liquid–liquid dispersion in a continuous oscillatory baffled reactor – Application to suspension polymerization

Microencapsulation of Docosahexaenoic Acid Algal Oil Using Spray Drying Technology

Improving Product Quality with Entrapped Stable Emulsions: From Theory to Industrial Application

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