Process for the concentration of diluted salt-containing sulphuric acid

US3992247A · 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: Oct 17, 1974
• Grant date: Nov 16, 1976
• Expiry date: Oct 17, 1994

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S159/19
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A two step process for concentrating and desalting dilute sulfuric acid including, first indirectly countercurrently contacting and heating the dilute acid with steam from a second step, removing overhead water vapor and withdrawing concentrated acid, and second further concentrating the acid by directly countercurrently contacting and heating the acid with superheated steam, removing overhead steam and additional water vapor, which is used in the first heating step. Acid of a higher concentration is withdrawn and cooled to crystallize and remove salts and the more highly concentrated sulphuric acid recovered.