Bis-β-hydroxyethyl terephthalate production process...

Details Bis-β-hydroxyethyl terephthalate production process... Bis-β-hydroxyethyl terephthalate production process...

2007-03-20

2007-03-20

McKane, Joseph K. (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

Reexamination Certificate

active

10623002

ABSTRACT:
An aromatic polyester is pre-decomposed by heating together with bis-β-hydroxyethyl terephthalate and/or a low condensate thereof and then, reacted with ethylene glycol to convert the terephthalic acid component of the pre-decomposed product into bis-β-hydroxyethyl terephthalate and/or a low condensate thereof.The thus obtained solution composition, that is, bis-β-hydroxyethyl terephthalate solution composition containing ethylene glycol, bis-β-hydroxyethyl terephthalate and cations and/or anions as impurities is brought into contact with a cation exchanger and/or an anion exchanger to remove cations and anions as impurities to produce bis-β-hydroxyethyl terephthalate having a small content of ions.The bis-β-hydroxyethyl terephthalate-containing mixture having a small content of ions is subjected to preliminary evaporation or distillation to distill off a compound having a boiling point lower than that of bis-β-hydroxyethyl terephthalate and then, to evaporation or distillation under reduced pressure to give purified bis-β-hydroxyethyl terephthalate.Thus, purified bis-β-hydroxyethyl terephthalate having a cation and anion total content of 15 ppm or less is obtained.

REFERENCES:
patent: 145323 (1978-09-01), None
patent: 06166747 (1994-06-01), None
Patent Abstracts of Japan Publication No. 06-166747, published on Jun. 14, 1994 in the name of assignee Toray Ind. Inc. by inventors Morita Toru and Okasaka Hidesada entitled Depolymerization of Aromatic Polyester.

Affiliated with

Also associated with

Rating

Bis-β-hydroxyethyl terephthalate production process... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Bis-β-hydroxyethyl terephthalate production process..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Bis-β-hydroxyethyl terephthalate production process... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3745921