Process for preparing aromatic isocyanates

US8829232B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Ulrich Penzel · Lauscha, DE
• Torsten Mattke · Ludwigshafen am Rhein, DE
• Andreas Wölfert · Bad Rappenau, DE
• Johannes Jacobs · Ossendrecht, NL
• Tsung-Chieh Cheng · Heppenheim, DE
• Kerstin Heinen · Lorsch, DE
• Eckhard Stroefer · Mannheim, DE
• Stefan Maixner · Schwetzingen, DE
• Wolfgang Mackenroth · Bad Dürkheim, DE
• Christian Tragut · Monsheim, DE
• Kai Thiele · Ekeren, BE
• Myung Un Won · Seongnam-si, KR

Key dates

• Filing date: Aug 6, 2009
• Grant date: Sep 9, 2014
• Expiry date: Sep 4, 2031

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C263/10
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to a process for preparing isocyanates by reacting the corresponding amines with phosgene in the liquid phase, if appropriate in the presence of at least one inert medium, in which the amine and the phosgene are first mixed in a mixing chamber (1) to give a reaction mixture and the reaction mixture is fed to a reactor, the amine being added through an orifice (3) arranged coaxially to the mixing chamber (1) and the phosgene being added through feed orifices (5) in at least two planes (7, 9) arranged at right angles to the axis (11) of the mixing chamber (1), or the phosgene being added through the orifice (3) arranged coaxially to the mixing chamber and the amine through the feed orifices (5) in at least two planes (7, 9) arranged at right angles to the axis (11) of the mixing chamber (1). At least one plane (9) is arranged upstream and at least one plane (7) downstream of the orifice (3) arranged coaxially to the mixing chamber (1) in main flow direction of the reaction mixture. The mean residence time of the reaction mixture in the mixing chamber (1) is not more than 20 ms.