Apparatus and a continuous process for converting polyester...

Details Apparatus and a continuous process for converting polyester... Apparatus and a continuous process for converting polyester...

C - Chemistry, Metallurgy

07

C

23/376, 260/473.

C07C 67/00 (2006.01) B01J 10/00 (2006.01)

Patent

CA 1043947

ABSTRACT OF THE DISCLOSURE A continuous process for the preparation of a dialkyl ester of an aromatic diacid, such as dimethyl tere- phthala e, from a waste polyester of the aromatic diacid and an aliphatic diol, such as polyethylene terephthalate, by 1) contacting the polyester waste with an excess of a monohydric alcohol, such as methanol, at a pressure about that of the partial vapor pressure of the monohydric alcohol and in the presence of an ester exchange catalyst, (2) deactivating the ester exchange catalyst, and (3) vaporizing and recycling excess monohydric alcohol.

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