Foam prevention during the regeneration of waste sulfuric acid with aromatic nitro compounds

US4150103A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Kurt Bodenbenner · Wiesbaden, DE
• Helmold von Plessen · Kelkheim, DE

Key dates

• Filing date: Nov 21, 1977
• Grant date: Apr 17, 1979
• Expiry date: Nov 21, 1997

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01B17/88
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The foam formation arising when aqueous waste sulfuric acid is concentrated can be suppressed by adding aromatic nitro compounds such as nitrobenzene to the acid.