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Marckolsheim, France

Auger F.,Syral | Auger F.,The Bakery | Andre C.,French National Institute for Agricultural Research | Andre C.,Heilongjiang University | And 4 more authors.
Chemical Engineering and Technology | Year: 2015

The optimal control of processes dealing with non-Newtonian liquids requires the knowledge and control of the power demand of the mixing equipment. In this context, an extension of the Metzner and Otto concept to planetary mixers is proposed to adapt this concept to planetary mixers. The theoretical part of this work defines modified expressions of Reynolds and power numbers. These definitions introduce a characteristic velocity uch that is used to define the parameter Ks. A planetary mixer is employed to experimentally ascertain this guideline. Power consumption measurements carried out by mixing shear-thinning fluids permit to determine the Ks factor. This factor varies only slightly with the flow behavior index and may be regarded as a defined constant for this geometry. Finally, experiments with an additional shear-thickening fluid confirm the validity of this approach. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

Auger F.,Syral | Auger F.,The Bakery | Delaplace G.,French National Institute for Agricultural Research | Bouvier L.,French National Institute for Agricultural Research | And 4 more authors.
Journal of Food Engineering | Year: 2013

The objective of this paper is to better characterize the influence of process parameters (impeller revolution speeds) on the performance of a planetary flour-beater mixer (mixer bowl P600 from Brabender) used in dough production. Firstly, we have theoretically described the path followed by the impeller tip into the vessel and the variation of the absolute velocity during its trajectory. This gives us indications during the transient mixing action of the material induced by this mixer. Secondly, we have theoretically and experimentally shown that for Newtonian fluids:The power dissipated by this mixer is strongly dependent on the impeller speed ratios.It is possible to obtain for this planetary mixer a unique master power curve, gathering on the same characteristic the influence of the dual impeller speeds on power consumption. This requires the introduction of a characteristic velocity, known as the maximal impeller tip velocity, into power and Reynolds numbers. The constant Kp of the mixer bowl P600, determined as the product of the modified Reynolds and power numbers, was found to be equal to 48.6. © 2013 Elsevier Ltd. All rights reserved. Source

Markande A.,University College Cork | Markande A.,Tereos Syral SAS | Nezzal A.,Nezzal Powder Consulting | Fitzpatrick J.,University College Cork | And 3 more authors.
Journal of Crystal Growth | Year: 2012

The effects of impurities on dextrose monohydrate crystallization were investigated. Crystal nucleation and growth kinetics in the presence of impurities were studied using an in-line focused beam reflectance monitoring (FBRM) technique and an in-line process refractometer. Experimental data were obtained from runs carried out at different impurity levels between 4 and 11 wt% in the high dextrose equivalent (DE) syrup. It was found that impurities have no significant influence on the solubility of dextrose in water. However, impurities have a clear influence on the nucleation and growth kinetics of dextrose monohydrate crystallization. Nucleation and growth rate were favored by low levels of impurities in the syrup. © 2012 Elsevier B.V. All rights reserved. Source

Gozlan C.,CNRS Institute of Molecular and Supramolecular Chemistry and Biochemistry | Gozlan C.,Tereos Syral SAS | Deruer E.,CNRS Institute of Molecular and Supramolecular Chemistry and Biochemistry | Duclos M.-C.,CNRS Institute of Molecular and Supramolecular Chemistry and Biochemistry | And 5 more authors.
Green Chemistry | Year: 2016

Amphiphilic sorbitan acetals have been prepared from sorbitan by acetalisation using linear aliphatic aldehydes or by transacetalisation starting from the corresponding aldehyde diethylacetals. A series of sorbitan acetals has been obtained with 29-81% isolated yields. It has been shown that these sorbitan acetals exist as a mixture of five-membered and six-membered regioisomers. Hydrogenolysis of the mixtures gave the corresponding sorbitan ethers as a mixture of 3 regioisomers with 55-85% isolated yields. A one-pot two-step procedure was also optimized from sorbitan giving similar results. The amphiphilic properties of sorbitan acetals and ethers were evaluated and both families exhibit interesting surfactant properties. © The Royal Society of Chemistry 2016. Source

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