Non-caking sodium chloride crystals, a process to make them, and their use in an electrolysis process
AssigneeAkzo Nobel N.V.
InventorHerman Frans Boon
Life of this patent
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Abstract
The invention relates to specific non-caking salt (NaCl) compositions with a pH of 1-10 comprising at least one metal (iron, titanium and/or chromium) complex of a hydroxypolycarboxylic acid, a process to make such compositions, as well as the use of such compositions in table salt, road salt, or electrolysis salt. Preferred compositions comprise an iron complex of (meso)tartaric acid for use in membrane electrolysis operations.
Claims5
Non-caking salt compositions wherein the salt is predominantly sodium chloride comprising at least one metal complex of mesotartaric acid or a mixture of hydroxypolycarboxylic acids wherein at least 5% by weight of the hydroxypolycarboxylic acids is mesotartaric acid and wherein the metal is iron, titanium, and/or chromium, and wherein the compositions
- are essentially nitrogen-free,
- comprise an effective amount of the metal complexes of mesotartaric acid or of a mixture of hydroxypolycarboxylic acids wherein at least 5% by weight of the hydroxypolycarboxylic acid is mesotartaric acid, with the molar ratio between metal and hydroxypolycarboxylic acid being from 0.2 to 10, and
- have a pH of 1 to 10, and
- optionally contain a pH buffering agent.
Dependencies are inferred from the claim text.