Production of ammonium salts of aromatic carboxylic acids

US7074953B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Ingo Klopp · Bad Dürkheim, DE
• Thomas Bogenstätter · Bad Dürkheim, DE
• Dirk Franke · Birkenheide, DE

Key dates

• Filing date: Dec 3, 2002
• Grant date: Jul 11, 2006
• Expiry date: Dec 3, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C51/412
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process is described for preparing ammonium salts of aromatic carboxylic acids by reacting an aromatic carboxylic acid with ammonia in an aprotic solvent, which comprises carrying out the reaction in a closed vessel by continuously introducing a solution of the aromatic carboxylic acid in the aprotic solvent and passing in gaseous ammonia so that an ammonia partial pressure in the range from 0.1 to 3 bar is maintained in the gas space of the vessel, and discharging a suspension of the ammonium salt in the aprotic solvent. The process allows the preparation of ammonium salts of defined crystal size having a narrow size distribution.