Process for preparing and purifying complex esters
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United States of America Patent
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Mar 26, 2002
Grant Date -
N/A
app pub date -
Oct 4, 1999
filing date -
May 7, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention concerns a process for manufacturing polyol complex esters. According to the method, a polyol, such as BEPD or NPG, is reacted with mono- and polyvalent acids in the presence of a catalyst to produce a reaction blend containing complex esters. According to the invention the acid components of the reaction blend are neutralized with a tertiary amine, and the complex esters are recovered from the thus treated reaction blend. The basic amines that are used form salt-like compounds with the carboxylic acids. The compounds enter the aqueous phase, from which they are easily separated, whereby the complex esters are recovered with high yield.
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