Patent ID: 6630601
Filing Date: 2003-10-07
Classification: C07C

Abstract:
A process for producing bis-&bgr;-hydroxyethyl terephthalate having a small content of ions, comprising the step of:bringing a bis-&bgr;-hydroxyethyl terephthalate solution composition comprising ethylene glycol, bis-&bgr;-hydroxyethyl terephthalate and cations and/or anions as impurities in a total amount not exceeding 3,000 ppm base on the content of bis-&bgr;-hydroxyethyl terephthalate into contact with a cation exchanger and then into contact with an anion exchanger to reduce the total content of cations and anions as impurities to 50 ppm or less based on the bis-&bgr;-hydroxyethyl terephthalate wherein the content of cations contained as impurities in the bis-&bgr;-hydroxyethyl terephthalate solution composition is 2,500 ppm or less based on the bis-&bgr;-hydroxyethyl terephthalate.