Global Patent Index - EP 1056900 B1

EP 1056900 B1 20050907 - METHOD AND APPARATUS FOR REDUCING VAT AND SULFUR DYES

Title (en)

METHOD AND APPARATUS FOR REDUCING VAT AND SULFUR DYES

Title (de)

VERFAHREN UND APPARATUR ZUR REDUKTION VON KÜPEN- UND SCHWEFELFARBSTOFFEN

Title (fr)

PROCEDE ET APPAREIL POUR LA REDUCTION DE COLORANTS DE CUVE ET DE COLORANTS AU SOUFRE

Publication

EP 1056900 B1 20050907 (DE)

Application

EP 99972704 A 19991124

Priority

  • CH 9900562 W 19991124
  • CH 233898 A 19981124

Abstract (en)

[origin: WO0031334A2] The invention relates to a method for the electrochemical reduction of vat and sulfur dyes in aqueous solutions, in steady-state conditions of reaction and a cycle which is largely free of reducing agents. The invention also relates to apparatus for carrying out said method. The steady-state conditions of reaction are obtained by means of a start reaction. The substances used for this reaction and the products resulting therefrom are extracted from the cycle. To maintain the cycle only dyes, an alkali and possibly small quantities of additional substances, such as surface-active agents, need to be added. No other chemicals active in the oxidation-reduction process are used.

IPC 1-7

D06P 1/22; D06P 1/30; C09B 7/02; C09B 49/00; C25B 3/04

IPC 8 full level

D06P 1/22 (2006.01); D06P 1/30 (2006.01); D06P 5/20 (2006.01)

CPC (source: EP US)

D06P 1/221 (2013.01 - EP US); D06P 1/30 (2013.01 - EP US); D06P 5/20 (2013.01 - EP US); D06P 5/2016 (2013.01 - EP US)

Designated contracting state (EPC)

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

DOCDB simple family (publication)

WO 0031334 A2 20000602; WO 0031334 A3 20001005; AT E304075 T1 20050915; AU 1146500 A 20000613; CA 2318796 A1 20000602; DE 59912528 D1 20051013; EP 1056900 A2 20001206; EP 1056900 B1 20050907; US 6627063 B1 20030930

DOCDB simple family (application)

CH 9900562 W 19991124; AT 99972704 T 19991124; AU 1146500 A 19991124; CA 2318796 A 19991124; DE 59912528 T 19991124; EP 99972704 A 19991124; US 60065600 A 20000831