Process for the separation and recovery of naphthalene-sulfonic acids from aqueous solutions

US5028736A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Ulrich Girrbach · Frankfurt am Main, DE
• Siegbert Rittner · Mörfelden, DE
• Siegfried Bildstein · Kelkheim, DE
• Klaus Schmiedel

Key dates

• Filing date: May 24, 1990
• Grant date: Jul 2, 1991
• Expiry date: May 24, 2010

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C303/44
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to a process for the separation and recovery of naphthalenesulfonic acids from aqueous solutions. In this, the naphthalenesulfonic acids are adsorbed on basic ion exchangers and subsequently desorbed again, preferably with the aid of an alkaline liquor, from which the alkali metal sulfonates are then precipitated by cooling.