Processes for the preparation of stannic oxide
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United States of America Patent
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Aug 11, 2015
Grant Date -
Dec 18, 2014
app pub date -
Dec 22, 2011
filing date -
Dec 22, 2011
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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−.
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