Process and mixing unit for the preparation of isocyanates by phosgenation of primary amines

US8079752B2 · kind B2 · utility

Assignee

• Bayer MaterialScience AG · DE

Inventors

• Andreas Rausch · Regensburg, DE
• Christian Steffens
• Dietmar Wastian · Dormagen, DE
• Manfred Keller-Killewald · Wasserburg am Inn, DE
• Matthias Böhm · Leverkusen, DE
• Joachim C. Ritter · Wilmington, US
• Marcus Grünewald · Dortmund, DE

Key dates

• Filing date: Dec 16, 2008
• Grant date: Dec 20, 2011
• Expiry date: Jul 19, 2030

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J2219/182
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The invention relates to a mixer reactor of the rotor-stator type. This mixer reactor comprises a substantially rotationally symmetric housing which has a distributing chamber, a mixing chamber, a front plate that modifies the cross-section of the housing between these two chambers, and there are separate inlets into the mixing chamber for at least two substances and an outlet for removing the mixed material or product. The inlet for the first substance is provided in the axis of rotation of the mixing chamber. Two or more channels are aligned radially outward from this inlet, and the first substance is transported through these channels and into the mixing chamber. The inlet for the at least second substance is constructed in the form of a plurality of openings in the front plate, these inlet openings being are arranged rotationally symmetrically to the axis of rotation. Each of these inlet openings for the at least second substance has a corresponding pin which can be displaced in the axial direction.