Process for preparing an anticorrosion component for an antifreeze

A process for preparing an anticorrosion component for antifreeze by oxidation of an oxydiol (I) in which x is 0 (zero) or a positive integer from 1 to 10 with molecular oxygen at a temperature of 20 to 100°C and a partial oxygen pressure of 0.01 to 2 MPa in the presence of water and a heterogeneous catalyst containing platinum to form an oxydicarboxylic acid (II) in which y is 0 (zero) or a positive integer from 1 to 10, in which the oxidation is conducted at a molar ratio of 0.002 ≤ n(Pt) / [n(oxydiol (l)) + n(oxydicarboxylic acid (ll))] ≤ 0.019 where "n(Pt)" is the molar amount of platinum, "n(oxydiol (I))" is the molar amount of oxydiol (I) and "n(oxydicarboxylic acid (II))" is the molar amount of oxydicarboxylic acid (II); at a water concentration of 50% to 95% by weight in the liquid phase; and (c) at a pH of 1 to 7.