Recovery of dicarboxylic aromatic acids from polyester resin...

Details Recovery of dicarboxylic aromatic acids from polyester resin... Recovery of dicarboxylic aromatic acids from polyester resin...

C - Chemistry, Metallurgy

07

C

C07C 51/09 (2006.01)

Patent

CA 2363972

A method for the recovery of dicarboxylic aromatic acids, in particular terephthalic acid, from manufactured aromatic polyester-resin articles for recycling, wherein the article, fragmented into chip form, is reacted in solution in a carboxylic acid with 2-6 carbon atoms and with a pKa from 4 to 6, preferably glacial acetic acid, in the presence of catalytic quantities of a strong acid with a pKa of less than 1, preferably aqueous hydrochloric acid or sulphuric acid, operating at temperatures from 160° to 250°C.

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