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A continuous microencapsulation process by interfacial polycondensation.

Le Sauze, Nathalie and Ricard, Alain and Theron, Félicie A continuous microencapsulation process by interfacial polycondensation. (2009) In: 2nd International Congress on Green Process Engineering,2nd European Process Intensification Conference, 14-17 June 2009, Venise,Italie .

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Abstract

A process to produce continuously microcapsules made of polyurea shell and containing cyclohexane as oil phase is proposed. The polymeric microcapsules are obtained via a two-step process involving emulsification of two immiscible fluids in static mixers followed by interfacial polycondensation in an empty pipe. The use of static mixers in turbulent flow to perform emulsification enables to obtain droplet sizes ranging from 10 to 60 ;m with short residence times (0.01 – 0.20 s). In order to calculate the residence time needed to bring the reaction to completion in the empty pipe, the time of encapsulation must be determined. Therefore the encapsulation step is also carried out in a stirred tank where the conversion of the monomer soluble in the aqueous phase is followed by monitoring the pH. Compared to a process where emulsification is carried out in a stirred tank, static mixers used in this study require less energy and enable to perform the microencapsulation continuously. Microencapsulation, interfacial polymerization, static mixer, process intensification

Item Type:Conference or Workshop Item (Speech)
Additional Information:This article is available in the CDrom : proceedings 14-17 june2009,Venice-Italie.
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
Laboratory name:
Laboratoire de Génie Chimique - LGC (Toulouse, France) - Réaction, mélange & séparation (RMS)
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Deposited By: Guylène Abadie

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