Title:
METHODS FOR THE PREPARATION OR PURIFICATION OF BIS- beta -HYDROXYETHYL TEREPHTHALATE
Document Type and Number:
WIPO Patent Application WO2001010812
Kind Code:
A9
Abstract:
A method which comprises heating an aromatic polyester together with bis- beta -hydroxyethyl terephthalate and/or low condensates thereof to conduct predecomposition, and reacting the predecomposition mixture with ethylene glycol to convert the terephthalic acid components contained in the mixture into bis- beta -hydroxyethyl terephthalate and/or low condensates thereof; a method which comprises bringing the solution composition obtained by the above process into contact with a cation exchanger and/or an anion exchanger to thereby obtain bis- beta -hydroxyethyl terephthalate lowered in ion content; and a method which comprises subjecting a bis- beta -hydroxyethyl terephthalate containing mixture lowered in ion content to preliminary evaporation or distillation to thereby distill away low-boiling compounds, and subjecting the resulting mixture to evaporation or distillation in vacuo to thereby obtain pure bis- beta -hydroxyethyl terephthalate having a total content of cations and anions of 15 ppm or below.
Inventors:
INADA SHUJI (JP)
SATO KIKUCHI (JP)
SATO KIKUCHI (JP)
Application Number:
PCT/JP1999/007284
Publication Date:
April 26, 2001
Filing Date:
December 24, 1999
Export Citation:
Assignee:
AIES CO LTD (JP)
INADA SHUJI (JP)
SATO KIKUCHI (JP)
INADA SHUJI (JP)
SATO KIKUCHI (JP)
International Classes:
C07C67/54; C07C67/56; (IPC1-7): C07C67/54; C07C67/333; C07C69/82
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