Process for the production of isocyanates

US4851571A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Heinz Sauer · Odenthal, DE
• Hermann Dallmeyer · Odenthal, DE
• Uwe J. Zarnack · Wittmund, DE
• Berthold Keggenhoff · Krefeld, DE
• Bernd Weber · Töging am Inn, DE

Key dates

• Filing date: May 5, 1988
• Grant date: Jul 25, 1989
• Expiry date: May 5, 2008

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J2219/00105
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The present invention is directed to a process for the production of a mono- and/or polyisocyanate by the phosgenation of a mono- and/or polyamine in a mixer which comprises PA0 (a) a casing having at least two inlets and at least one outlet, PA0 (b) a rotatable shaft extending through the casing, PA0 (c) at least one rotor disc attached to the shaft such that the rotor disc is perpendicular to the shaft, PA0 (d) at least one stator disc attached to the casing such that the stator disc is parallel to the rotor disc and has an opening such that the shaft can pass through the stator disc, PA0 (e) optionally at least one running wheel attached to the shaft and containing openings such that when the shaft is rotating the running wheel provides a pumping effect to the reaction mixture passing through the mixer, PA0 (f) at least one inlet through the casing for introducing a phosgene solution axially to the shaft and against the rotor disc, PA0 (g) at least one inlet through the casing for introducing a mono- and/or polyamine amine solution or suspension against the rotor disc at a point which is radially outward from inlet (f), by introducing the phosgene solution and the amine solution…