Global Patent Index - EP 1051384 A1

EP 1051384 A1 2000-11-15 - METHOD FOR PRODUCING A PURIFIED ALKALINE METAL TEREPHTHALATE, DERIVED FROM THE PRODUCTS OF SAPONIFICATION OF POLYTEREPHTHALATES

Title (en)

METHOD FOR PRODUCING A PURIFIED ALKALINE METAL TEREPHTHALATE, DERIVED FROM THE PRODUCTS OF SAPONIFICATION OF POLYTEREPHTHALATES

Title (de)

VERFAHREN ZUR HERSTELLUNG VON EINEM GEREINIGTEN TEREPHTHALAT EINES AUS DER VERSEIFUNG VON ALKYLENPOLYTEREPHTHALATABFALLPRODUKTEN HERGESTELLTEN ALKALISCHEN METALLS

Title (fr)

PROCEDE POUR LA PRODUCTION DE TEREPHTALATE D'UN METAL ALCALIN PURIFIE, ISSU DE PRODUITS DE SAPONIFICATION DE POLYTEREPHTALATES D'ALKYLENE DE RECUPERATION

Publication

EP 1051384 A1 (FR)

Application

EP 99901650 A

Priority

  • FR 9900175 W
  • FR 9801088 A

Abstract (en)

[origin: FR2774374A1] The invention concerns a method for producing terephthalate of alkaline metal and alkylene glycol from recuperated alkylene polyterephthalate. It comprises saponification of said alkylene terephthalates with an aqueous sodium solution, adding a sufficient volume of water to ensure solubilization of the entire alkaline metal terephthalate produced in the reaction medium liquid phase and crystallisation of the sodium terephthalate by concentration of said liquid phase. The resulting sodium terephthalate can be directly used for producing pure terephthalic acid usable for the renewed production of alkylene polyterephthalates to be used in the food industry.

IPC 1-7 (main, further and additional classification)

C07C 51/09; C07C 63/26

IPC 8 full level (invention and additional information)

C07C 51/09 (2006.01)

CPC (invention and additional information)

C07C 51/09 (2013.01); C08J 11/16 (2013.01); C08J 2367/02 (2013.01); Y02W 30/705 (2015.05)

Combination set (CPC)

C07C 51/09 + C07C 63/26

Citation (search report)

See references of WO 9938835A1

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

FR 2774374 A1 19990806; FR 2774374 B1 20010921; AU 2168399 A 19990816; EP 1051384 A1 20001115; US 6657077 B1 20031202; WO 9938835 A1 19990805

INPADOC legal status


2004-10-13 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20040407

2002-06-19 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20020507

2000-11-15 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20000828

2000-11-15 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE