Patent ID: 7641721
Filing Date: 2010-01-05
Classification: C01G,C23C

Abstract:
1. An aqueous solution of a chromium salt comprising: an oxalic acid content of 8% by weight or less relative to chromium, wherein the chromium salt is a chromium chloride, wherein the aqueous solution contains a basic chromium chloride represented by the composition formula Cr(OH) wherein a total organic carbon content in the aqueous solution of the chromium salt is 0.5 to 4% by weight; wherein the aqueous solution of the chromium salt is produced by a process comprising the steps of: adding an organic reducing agent composed of a monohydric alcohol or a dihydric alcohol to an aqueous solution of chromic acid to reduce part of a chromic acid in advance in a first stage of reaction; mixing hydrochloric acid and the organic reducing agent to form a mixture; and adding the mixture to the aqueous solution of chromic acid so as to complete the reaction.