Catalyst and process
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United States of America Patent
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Jun 4, 2013
Grant Date -
Oct 25, 2012
app pub date -
Jul 9, 2012
filing date -
Dec 4, 2002
priority date (Note) -
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Abstract
A catalyst composition comprises the reaction product of an alkoxide or condensed alkoxide of a metal M, selected from titanium, zirconium, hafnium, aluminum, or a lanthanide, an alcohol containing at least two hydroxyl groups, a 2-hydroxy carboxylic acid and a base, wherein the molar ratio of base to 2-hydroxy carboxylic acid is in the range 0.01-0.79:1. The composition is useful as a catalyst for esterification reactions, especially for the production of polyesters such as polyethylene terephthalate, polytrimethylene terephthalate and polybutylene terephthalate.
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