Process for the reduction of dyes
AssigneeVerein Zur Forderung der Forschung und Entwicklung in der Textilwirtschaft
InventorThomas Bechtold
Life of this patent
Estimating the term…
Abstract
In a process for reducing dyes in aqueous solution, a pair of electrodes is immersed in the solution. The cathode potential is maintained below the value at which hydrogen is evolved. A reducing agent is used, the redox potential of which, increased by the charge transfer overvoltage required for the reduction of the oxidized form of the reducing agent to the reduced form at the cathode, is less than the cathode potential.
Claims6
A process for the reduction of dye in an aqueous solution having a pH greater than 9, comprising employing a reducing agent which is present dissolved in the solution in a reduced and oxidized form, wherein a pair of electrodes is introduced into the solution, the cathode potential of said electrode pair being held at a value at which essentially no hydrogen is generated but which is sufficiently negative to return essentially all of the reducing agent which is transformed into its oxidized form in the process of reducing the dye, into its reducing form.
Dependencies are inferred from the claim text.