Process for regeneration of sulfuric acid

US4157381A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Kurt Bodenbenner · Wiesbaden, DE
• Gerhard Muller · Grafing, DE
• Heinrich Muller · Culver City, US

Key dates

• Filing date: Sep 14, 1978
• Grant date: Jun 5, 1979
• Expiry date: Sep 14, 1998

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01B17/905
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The invention provides a process for the regeneration of dilute sulfuric acid containing organic impurities and possibly also inorganic salt in several steps. In the first step, the dilute acid is concentrated by indirect heat exchange with the vapors of the second step, and in the second step it is concentrated by direct heat exchange with a countercurrent mixture of steam and acid vapors coming from a third step. In this third step, the acid discharged from the second step is mixed in direct heat exchange with superheated steam. The regenerated sulfuric acid is separated from this mixture and the remaining steam/vapor mixture is forwarded to the second step. In the case where the dilute acid contains organic substances, an oxidant is added in at least one of these process steps.