Stabilized diperoxyalkanedioic acids and aromatic peroxycarboxylic acids
OwnerReinhard Stober, Rolf Wirthwein +1inventors
InventorsReinhard Stober, Rolf Wirthwein, Christian Hase
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Abstract
Diperoxyalkanedioic acids and aromatic peroxycarboxylic acids are prepared by reacting a dialkanoic acid or an aromatic carboxylic acid with hydrogen peroxide in sulfuric acid and then producing a desensitizing agent for the peracid in situ by adding alkali metal hydroxide, alkali metal aluminate or an alkaline earth metal hydroxide so that the filtrate is free of sulfuric acid. The resulting salt coats the peracid and the product is desensitized and stable in storage.
Claims31
A process for the production of a peroxy acid which is storage stable and desensitized comprising adding to the mixture resulting from the reaction of an alkanedioic acid having at least five carbon atoms or an aromatic carboxylic acid having the formula ##STR2## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 are hydrogen, COOH, 1-4 carbon atom alkyl, 1-4 carbon atom alkoxy or halogen with hydrogen peroxide in sulfuric acid a material which reacts with sulfuric acid to form a sulfate salt as a desensitizing agent, said material being an alkali metal hydroxide, an alkaline earth metal hydroxide or sodium aluminate and being added in an amount to raise the pH to 2-6.
An aqueous composition of pH 2 to 6 suitable for forming desensitized, storage stable peroxy acid upon drying, said aqueous composition containing hydrogen peroxide and a diperoxyalkanedioic acid having 5 to 16 carbon atoms or the peroxy acid of an aromatic carboxylic acid having the formula ##STR3## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 are hydrogen, COOH, 1-4 carbon atom alkyl, 1-4 carbon atom alkoxy or halogen and prepared by a process consisting essentially of adding to the aqueous mixture resulting from the reaction of an alkanedioic acid having 5 to 16 carbon atoms or an aromatic carboxylic acid of formula (I) with aqueous hydrogen peroxide and sulfuric acid a material which reacts with sulfuric acid to form a sulfate salt and is an alkali metal hydroxide, an alkaline earth metal hydroxide, or sodium aluminate.
Dependencies are inferred from the claim text.