Reduction of content of carboxylic acids and derivatives thereof in oleum, disulfuric acid or concentrated sulfuric acid
AssigneeSolvay SA
InventorsJean-Marie Blaude, Benoit Gosselin, Alain Lambert, Matthias Marek, Harald Krueger, Jan Schostag, Miriam Heyd
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Abstract
The present invention concerns a process for the reduction of content of carboxylic acids and derivatives thereof in oleum, disulfuric acid or concentrated sulfuric acid. The invention further concerns a process for the manufacture of carboxylic acid anhydrides comprising the process for the reduction of content of carboxylic acids and derivatives thereof from oleum, disulfuric acid or concentrated sulfuric acid.
Claims16
A process for the reduction of a content of carboxylic acids and derivatives thereof in oleum, disulfuric acid or sulfuric acid, the process comprising submitting a first fraction comprising oleum, disulfuric acid or sulfuric acid with a first content of carboxylic acid or at least one anhydride derivative thereof to a gas stripping operation in order to obtain a second fraction comprising oleum, disulfuric acid or sulfuric acid with a second content of carboxylic acid or at least one anhydride derivative thereof, wherein the second content of carboxylic acid or at least one anhydride derivative thereof in the second fraction comprising oleum, disulfuric acid or sulfuric acid is lower than the first content of carboxylic acid or at least one anhydride derivative thereof in the first fraction comprising oleum, disulfuric acid or sulfuric acid,
- wherein the carboxylic acid and/or carboxylic acid anhydride derivative of the first content is a halogenated carboxylic acid of formula (I) HalR2C—C(O)—OH, wherein Hal is selected from the group consisting of F, Cl and Br, and wherein R is independently selected from the group consisting of H, F, Cl, Br, alkyl, and aryl, or a halogenated carboxylic acid anhydride derivative thereof.
Dependencies are inferred from the claim text.