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US 7,842,272 B2Granted
Process for the regeneration of sulfuric acid
AssigneeWacker Chemie AG
InventorsKlaus Kaeppler, Reinhold Iretzberger, Gerhard Nagy
Life of this patent
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Abstract
Sulfuric acid contaminated with byproducts of chloromethane scrubbing is regenerated for reuse in the scrubbing process by diluting with water to not lower than about a 55 weight percent concentration, heating the diluted acid to boiling at not more than about 135° C., concentrating the acid to a concentration of minimally 80 weight percent at a temperature of at least 170° C., and reacting the concentrated acid with an oxidizing agent.
Claims7
A process for the regeneration of used sulfuric acid from the scrubbing of chloromethanes which is contaminated by secondary components, comprising:
- a) diluting the used sulfuric acid by addition of liquid water and introduction of steam to a concentration of at most about 55% by weight of sulfuric acid and heating the diluted acid to boiling at a temperature of at most 135° C., and
- b) concentrating the dilute acid from step a) to a concentration of at least 80% by weight at reduced pressure and at a temperature of at least 170° C., and thereafter reacting the concentrated acid with an oxidizing agent.
Dependencies are inferred from the claim text.