Global Patent Index - EP 1131276 A4

EP 1131276 A4 2002-09-18 - PROCESS OF PURIFYING AND PRODUCING HIGH PURITY AROMATIC POLYCARBOXYLIC ACIDS AND DERIVATIVES THEREOF

Title (en)

PROCESS OF PURIFYING AND PRODUCING HIGH PURITY AROMATIC POLYCARBOXYLIC ACIDS AND DERIVATIVES THEREOF

Title (de)

VERFAHREN ZUR REINIGUNG UND HERSTELLUNG VON HOCHREINEN AROMATISCHEN POLYCARBONSÄUREN UND DERIVATEN DAVON

Title (fr)

PROCEDE DE PURIFICATION ET DE FABRICATION D'ACIDES POLYCARBOXYLIQUES AROMATIQUES DE GRANDE PURETE ET DE LEURS DERIVES

Publication

EP 1131276 A4 (EN)

Application

EP 99967120 A

Priority

  • US 9927604 W
  • US 10964898 P
  • US 26749999 A
  • US 28626299 A
  • US 34748699 A

Abstract (en)

[origin: WO0031014A1] The present invention provides a solvent extraction purification method for aromatic polycarboxylic acids or derivatives that meet or exceed polymer-grade specification. The method includes dissolving a crude aromatic polycarboxylic acid or derivative in a base compound; removing impurities and excessive base compound; and removing residual base compound while making purified product. The purification method removes not only the impurities from the crude acid or derivative, but also the residual base compound from finished product that otherwise will contaminate the product. The salt in the cake is converted to product by acid-substitution, thermal decomposition, or electrolysis. The method uses base-extraction solvents to extract base compound and impurities from the salt. The residual base compound in the recovered product is then removed by leaching, stripping, thermal agitating with electromagnetic waves, or evaporation with thermal decomposition. The purification method allows eliminating crystallizers for crystallization and equipment for drying and pneumatically carrying. Finally, the purification method is combined with the oxidation and solvent recovery in prior art to use only one set of process steps, instead of two, to produce aromatic polycarboxylic acids or derivatives.

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

C07C 51/42

IPC 8 full level (invention and additional information)

C07C 63/26 (2006.01); C07B 61/00 (2006.01); C07C 51/265 (2006.01); C07C 51/42 (2006.01); C07C 51/43 (2006.01); C07C 51/487 (2006.01); C07C 63/38 (2006.01); C07C 67/48 (2006.01)

CPC (invention and additional information)

C07C 51/42 (2013.01); C07C 67/48 (2013.01)

Combination set (CPC)

  1. C07C 51/42 + C07C 63/26
  2. C07C 67/48 + C07C 69/76

Citation (search report)

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

WO 0031014 A1 20000602; WO 0031014 A8 20000817; CN 1264798 C 20060719; CN 1332714 A 20020123; EP 1131276 A1 20010912; EP 1131276 A4 20020918; JP 2003510247 A 20030318

INPADOC legal status


2007-11-21 [18D] APPLICATION DEEMED TO BE WITHDRAWN

- Effective date: 20070601

2004-05-26 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20040408

2002-09-18 [A4] DESPATCH OF SUPPLEMENTARY SEARCH REPORT

- Effective date: 20020801

2002-09-18 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A4

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

2001-09-12 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20010621

2001-09-12 [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