Processes for the preparation of stannic oxide
AssigneeGABA International Holding GmbH
InventorsAlan C. Ceresa, Rene Heckendorn, Elisabeth Scherrer
Life of this patent
Estimating the term…
Abstract
Disclosed herein are processes for oxidising Sn2+ dissolved in an aqueous solution to stannic compounds using NO2 and optionally O2 as oxidants, wherein the aqueous solution is kept at a pH in the range of 0 to 7, wherein a salt Sn2+(Xn−)2/n and the oxidants are used according to the reaction scheme a Sn2+(Xn−)2/n +b O2+c NO2−→stannic compounds in which scheme a, b and c are mole numbers; with the proviso that when b is essentially zero, then the aqueous solution is essentially free of Cl−, HSO4− and SO42−.
Claims13
A process for oxidising Sn2+ dissolved in an aqueous solution to stannic compounds using NO2− and optionally O2 as oxidants, said dissolved Sn2+ being obtained from a salt Sn2+(Xn−)2/n, wherein Xn− denotes a counter anion and n is an integer of 1 to 2;
- wherein during said oxidation said aqueous solution is kept at a pH in the range of 0 to 7, and said salt Sn2+(Xn−)2/n and said oxidants are used according to the reaction scheme a Sn2+(Xn−)2/n+b O2+c NO2−→stannic compounds in which scheme a, b and c are mole numbers;
- with the proviso that when b is essentially zero, then said aqueous solution is essentially free of Cl−, HSO4− and SO42−.
Dependencies are inferred from the claim text.