Process for purifying sulfuric acid
AssigneeWacker Chemie AG
InventorsKonrad Mautner, Gerhard Nagy, Martin Kankowsky
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Abstract
In the process, used sulfuric acid which contains, as minor constituents, methylsulfuric acid, dimethyl ether, methanol, aliphatic and olefinic hydrocarbons, chlorinated hydrocarbons and oligomeric siloxanes, in a first step; (1) used sulfuric acid is diluted by introducing steam and optionally by adding liquid water to a concentration of at most 55% by weight sulfuric acid and is heated to boiling at a maximum of 135.degree. C. and in a second step; (2) the sulfuric acid from the first step is reacted with an oxidizing agent at a temperature of from 20.degree. C. to 130.degree. C.
Claims7
A process for purifying used sulfuric acid which contains, as minor constituents, methylsulfuric acid, dimethyl ether, methanol, aliphatic and olefinic hydrocarbons, chlorinated hydrocarbons and oligomeric siloxanes, where in a first step;
- (1) diluting the used sulfuric acid to a concentration of at most 55% by weight with steam and optionally water, in a second step;
- (2) heating to boiling at a maximum temperature of 135.degree. C. with the steam from step 1 to remove the minor constituents;
- and in a third step;
- (3) reacting the acid from step 2 with an oxidizing agent at a temperature of from 20.degree. C. to 130.degree. C.
Dependencies are inferred from the claim text.