Bayer Aktiengesellschaft

Siegbert Humburger

Gottfried Zaby

Helmut Judat

Stefaan De Vos

Hans-Joachim Diehr

Hermann Arold

Helmut Porkert

Eric Boonstra

Rolf W Eckermann

Rolf-W Eckermann

The present invention relates to a process for the continuous preparation of organic mono- or polyisocyanates by the reaction of the mono- or polyamines corresponding to the mono- or polyisocyanates with phosgene dissolved in an organic solvent. The phosgene solution and the amine component, optionally also in the form of a solution, are brought together inside a nozzle (1) by subjecting the stream of one component to a constriction (3) and supplying the other component into this constriction (3) from the side as partial streams through several apertures (5).

Process for the continuous preparation of monoisocyanates or

This invention relates to a process for the continuous production of an organic monoisocyanate or polyisocyanate in a single stage reaction. A reaction mixture is formed by continuously mixing, at a temperature elevated above room temperature but not exceeding about 150.degree. C., a solution in a substantially inert organic solvent of a monoamine or polyamine corresponding to the monoisocyanate or polyisocyanate and a solution in a substantially inert organic solvent of phosgene. The reaction mixture is continuously passed upwards from below through a reaction column comprising at least 10 separate chambers separated by perforated plates, wherein each perforation of said perforated plates has a diameter of less than about 20 mm.

Process for the continuous production of mono- and polyisocyanates

A process for the preparation of a dimethyl polysulphide of the formula

Preparation of dimethyl polysulphides

Growing community of inventors

Leverkusen, Germany

Siegbert Humburger