Prevention of precipitation from nitrated aromatic crude products

US8637712B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Holger Allardt · Schwarzheide, DE
• Andreas Raichle · Ludwigshafen, DE
• Reiner Reetz · Schwarzheide, DE
• Johannes Büttner · Ruhland, DE
• Michael Zollinger · Chelsea, US
• Stefanie Haase · Pulsnitz, DE
• Rüdiger Fritz · Bernsdorf, DE

Key dates

• Filing date: Jan 31, 2012
• Grant date: Jan 28, 2014
• Expiry date: Apr 1, 2032

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J2220/56
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Precipitations of nitrohydroxyaromatic salts out of the nitrated crude products obtained in the nitration of aromatic compounds after alkaline scrubbing, for example mononitrotoluenes, are prevented by contacting the nitrated crude products with an acidic ion exchanger. The nitrated crude products are preferably selected from a feedstream to a distillation column, a bottoms circulation stream of a distillation column and a feedstream to a vaporizer.