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Développement, conception et mise au point d’un procédé de purification du bio-acide acrylique par cristallisation en milieu fondu

Abstract : With a global market exceeding four million tons per year, acrylic acid (AA) is a major intermediate chemical. The current AA synthesis is based on propylene, which is produced from oil. Thus, a novel production route is envisioned, based on glycerol, a green byproduct of oleochemistry and biodiesel production. However, current crude biobased AA contains a higher proportion of PA than AA from petrochemical origin. Classical purification techniques of AA cannot efficiently separate these two chemicals. In a first part, liquid-solid phase diagram of the binary system AA + PA is determined. This liquid-solid equilibrium exhibits an peritectic behavior at 50.0% (mol) d’AA, a eutectic point at 25.65% (mol) d’AA and thus, this diagram is favorable to the purification of AA. First purification tests by static solid layer melt crystalliza tion show promising results: a correct separation efficiency for a yield varying between 60 et 70 %. To improve heat and mass transfer, dynamic crystallization set-up are developed, including a falling film crystallizer. This set-up multiplies by 2.8 the productivity of purification, while keeping a good separation efficiency. To reduce supercooling and to keep a good heat transfer despite the crystalline layer which is a thermal insulator, micro-and milli-structured crystallization surface are considered. Productivity is further improved and heat transfer modeling confirms the experimental results. To be nearer to industrial conditions, synthetic crude bio-AA is purified. Melt crystallization can separate all the impurities which are present in the medium. To scale the overall process a cascade model of closed crystallizers with recycling the differents phases, is proposed. The intensification of the process of melt crystallization permits to consider the implementation of the industrial process.
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https://hal.univ-lorraine.fr/tel-01749474
Contributor : Marie Le Page Mostefa <>
Submitted on : Friday, April 7, 2017 - 2:56:15 PM
Last modification on : Monday, March 29, 2021 - 4:06:44 PM
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Marie Le Page Mostefa. Développement, conception et mise au point d’un procédé de purification du bio-acide acrylique par cristallisation en milieu fondu . Génie des procédés. Université de lorraine, 2012. Français. ⟨NNT : 2012LORR0302⟩. ⟨tel-01749474v2⟩

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