Process for recycling polyester obtained from orto, meta and par

Details Process for recycling polyester obtained from orto, meta and par Process for recycling polyester obtained from orto, meta and par

1998-01-02

1999-09-07

Barts, Samuel

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

C07C 6702

Patent

active

059489340

ABSTRACT:
A process is disclosed for recycling of polyester used in the fabrication of molded plastic goods, such as films, carbonated beverage bottles and particularly waste poly(ethylene terephthalate) (PET) bottle grade, manufacturing residues and other manufactured articles. The process comprises the alcoholysis of washed or cleaned, crushed or grinded PET in one step of reaction, with alcohols containing from 1 to 4 carbon atoms in their molecule, in an autoclave reactor capable to support pressures of about 10 MPa (100 Kg/cm.sup.2 gage) and operating temperatures in the range of 10 to 300.degree. C.; followed by one or several steps of reaction product purification such as crystallization and/or centrifugation and/or distillation. The alcoholysis reaction product is a dialkyl aromatic ester (DAAE), which is recovered by filtration or centrifugation and depending on the alcohol used in the process the DAAE obtained are several industrial products such as dimethyl terephthalate, dibutyl terephthalate, etc. From the DAAE it is possible to obtain, through a transesterification reaction, plasticizers as dioctyl terephthalate and through a hydrolysis reaction, a pure terephthalic acid. From the process mother liquor it is possible to recover through distillation the pure process-alcohol and ethylene glycol and/or other different industrial glycols that were forming the PET molecules, and an industriallizable distillation residue.

REFERENCES:
patent: 5252615 (1993-10-01), Rao et al.

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