Depolymerization method and device

C - Chemistry – Metallurgy – 07 – C

Patent

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C07C 67/333 (2006.01) B01J 8/18 (2006.01) C07C 69/54 (2006.01)

Patent

CA 2527969

The invention concerns the recovery of monomeric esters of substituted or unsubstituted acrylic acid or of monomers containing styrene from polymer material (66) containing corresponding structural units. According to the invention, the polymer material is brought into contact with a heat transfer medium inside a heated reactor (51). The heat transfer medium and the polymer material (66) are agitated inside the reactor (51), and gas, which forms inside the reactor (51) and which contains the monomer, is drawn out of the reactor (51). The heat transfer medium contains a multitude of spherical particles (67), which has been proven to be particularly advantageous for achieving high yields and purity of the monomer to be recovered.

L'invention concerne un procédé de récupération d'esters monomères d'acide acrylique substitué ou non substitué, ou de monomères renfermant du styrol, provenant de matériaux polymères (66) renfermant des motifs correspondants, procédé caractérisé en ce que le matériau polymère est mis en contact, dans un réacteur chauffé (51), avec un caloporteur, en ce que le caloporteur et le matériau polymère (66) sont agités dans le réacteur (51), et en ce que le gaz prenant naissance dans le réacteur (51) et renfermant le monomère est évacué de ce réacteur (51). L'invention permet d'obtenir avantageusement des rendements élevés et une pureté élevée du monomère récupéré, grâce au fait que le caloporteur présente une pluralité de particules sphériques (67).

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