HYDROXYCARBOXYLIC ACIDS AND SALTS

摘要

Compositions which inhibit corrosion and alter the physical properties of concrete (admixtures) are prepared from salt mixtures of hydroxycarboxylic acids, carboxylic acids, and nitric acid. The salt mixtures are prepared by neutralizing acid product mixtures from the oxidation of polyols using nitric acid and oxygen as the oxidizing agents. Nitric acid is removed from the hydroxycarboxylic acids by evaporation and diffusion dialysis.

主权项

1. A corrosion inhibiting composition for metal comprising at least one organic acid salt prepared by a method comprising the steps of:
a) preparing an aqueous solution of at least one organic compound suitable for nitric acid oxidation; b) combining, over time, the aqueous solution of the at least one organic compound and an aqueous solution of nitric acid to oxidize the at least one organic compound to at least one organic acid; c) removing a portion of the nitric acid from the combined aqueous solution through an evaporation process; and d) making basic with at least one base the solution from which nitric acid has been removed to convert residual nitric acid to inorganic nitrate and to convert the at least one organic acid to the at least one organic acid salt.