Back to results
US 5,633,358 AGranted
Process for bleaching aqueous surfactant solutions
AssigneeHuels Aktiengesellschaft
InventorsJuergen Gruetzke, Stefan Schmidt, Gerda Grund, Uwe Tanger
Life of this patent
Estimating the term…
Abstract
The invention relates to a process for bleaching aqueous alkyl polyglycoside solutions using hydrogen peroxide, in a first step the actual bleaching being carried out at alkaline pHs in the presence of an inorganic additive (hydrogen peroxide decomposition inhibitor) and in a second step a specific decomposition of the unreacted hydrogen peroxide being performed by contact with transition metals or inorganic compounds thereof.
Claims10
A process for bleaching an aqueous, concentrated surfactant solution comprising
- (1) in a first step adding a bleaching composition to said solution to bleach said surfactant solution at an alkaline pH, wherein the composition comprises hydrogen peroxide in the presence of an inorganic hydrogen peroxide decomposition inhibitor, and
- (2) in a second subsequent step decomposing unreacted hydrogen peroxide and/or oxidizing secondary products formed therefrom in the presence of the decomposition inhibitor by the step consisting essentially of contacting the solution resulting from said first step with a transition metal and/or compound thereof.
Dependencies are inferred from the claim text.