Production of dicarboxylic acids

Details Production of dicarboxylic acids Production of dicarboxylic acids

C - Chemistry, Metallurgy

07

C

C07C 63/26 (2006.01) C07C 29/128 (2006.01) C07C 31/20 (2006.01) C07C 51/09 (2006.01) C07C 67/00 (2006.01) C07C 69/82 (2006.01)

Patent

CA 2165651

Dicarboxylic acids or esters thereof are recovered from solid phase polyester materials, such as post-consumer products and factory scrap, by initially subjecting the polyester to a glycolysis reaction (in one or more stages) to produce a liquid phase medium containing depolymerisation products. The liquid phase medium is then contacted with aqueous medium or alcohol in one or ore stages to produce the dicarboxylic acid or an ester thereof together with glycol.

On récupère des acides dicarboxyliques ou des esters de ceux-ci à partir de matériaux en polyester en phase solide, tels que des produits de post-consommation et des rebuts d'usine, en soumettant d'abord le polyester à une réaction de glycolyse (en une ou plusieurs phases) afin d'obtenir un milieu en phase liquide contenant des produits de dépolymérisation. Le milieu en phase liquide est ensuite mis en contact avec un milieu aqueux ou de l'alcool, en une ou plusieurs phases, afin d'obtenir l'acide dicarboxylique ou un ester de celui-ci avec du glycol.

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