Back to results
US 7,608,652 B2Granted
Catalyst composition for producing polyethylene terephthalate from terephthalic acid and ethylene glycol, and process therefore
AssigneeSaudi Basic Industries Corporation
InventorsZahir Bashir, Jamil Siddiqui, Venkatanathan Sampath, Khalid Al-Luhaidan
Life of this patent
Estimating the term…
Abstract
The present invention relates to a catalyst composition for producing polyethylene terephthalate from terephthalic acid and ethylene glycol, comprising: (i) an antimony compound, being present such that the elemental antimony is in a range of about 15 ppm to less than 150 ppm; (ii) a zinc compound, being present such that the elemental zinc is in a range of about 40 to about 160 ppm; as well as a process for the preparation thereof.
Claims15
Process for the production of polyethylene terephthalate from terephthalic acid and ethylene glycol, comprising the steps of:
- (a) preparing a catalyst composition consisting of an antimony compound, being present such that the elemental antimony content is in a range of about 100 to about 140 ppm, and a zinc compound, being present such that the elemental zinc content is in a range of about 80 to about 140 ppm, wherein the ppm amounts by weight are based on the theoretical yield of polyethylene terephthalate;
- (b) placing the catalyst composition, the terephthalic acid and the ethylene glycol in a vessel;
- and
- (c) reacting the terephthalic acid and the ethylene glycol in an esterification step and a polycondensation step to obtain polyethylene terephthalate.
1 more element
Dependencies are inferred from the claim text.