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Etude d'un procédé de dévolatisation de traces d'anhydride maléique au sein d'une matrice polypropylène à l'aide d'une extrudeuse bi-vis

Abstract : The devolatilization of maleic anhydride from polypropylene has been studed in the aim of contributing to the industrial developpement of the on-line purification of polyolefin containing unreacted monomers. This work was more especially dedicated to find out process parameters allowing to obtain, at constant productivity rate, a polymer with the lowest maleic anhydride amount at the exit of the extruder. An original way for the quantification of maleic anhydride traces -till 20 ppm- has been developed and approved. The higher the temperature, vacuum level and rotational screw speed, the lower the maleic anhydride amount. The proper choice in the screw profile allows to maximize the polymervapor area by volume unit and the position of degassing pipes controls the value of the thermodynamic force along the vacuum zones. The polymer viscosity is important only for the highest vacuum level and the weak influence of initial maleic anhydride content contributes to the industrial process stability. Development of physical equations based model has given the ability to determine different unknown parameters, like the mass transfer coefficient or the Flory Huggins parameter, thanks to experimental data. Such a model has been used for simulation and optimization steps. Then, the use of C02 has been evaluated as a stripping aid agent for devolatilization. The increase in the value of polymer-vapor area by volume unit, by means of hubble growth is an effective way to reduce the maleic anhydride content
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Theses
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http://docnum.univ-lorraine.fr/prive/INPL_T_2002_PIERNOT_O.pdf
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https://hal.univ-lorraine.fr/tel-01752252
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Submitted on : Thursday, March 29, 2018 - 1:39:45 PM
Last modification on : Wednesday, October 14, 2020 - 3:54:22 AM

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  • HAL Id : tel-01752252, version 1

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Olivier Piernot. Etude d'un procédé de dévolatisation de traces d'anhydride maléique au sein d'une matrice polypropylène à l'aide d'une extrudeuse bi-vis. Autre. Institut National Polytechnique de Lorraine, 2002. Français. ⟨NNT : 2002INPL077N⟩. ⟨tel-01752252⟩

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