Method and apparatus for producing polyester polyol, polyester polyol and polyurethane foam
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United States of America Patent
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Dec 23, 2003
Grant Date -
Mar 21, 2002
app pub date -
Jul 26, 2001
filing date -
Jul 31, 2000
priority date (Note) -
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Abstract
To provide a method for producing polyester polyol that can provide a simple process to produce extensively improved production efficiencies and also produce the polyester polyol of stable in quality, an apparatus for producing the polyester polyol produced by the method, a polyester polyol produced by the method, and a polyurethane foam obtained by use of the polyester polyol produced by the method, polyethylene terephthalate and raw polyol are allowed to react in a reaction vessel to produce polyester polyol and also ethylene glycol which is a by-product of the reaction is distilled off and the distillate is modified in a modifying vessel so that it can have a predetermined hydroxyl value and then is fed to the reaction vessel again as the raw glycol, to thereby produce the polyester polyol.
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