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
Application
Priority
- CH 9900562 W 19991124
- CH 233898 A 19981124
Abstract (en)
[origin: US6627063B1] 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
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