Process for the continuous preparation of isocyanates

US7547801B2 · kind B2 · utility

Assignee

• Bayer MaterialScience AG · DE

Inventors

• Fritz Pohl · Wittmund, DE
• Ricardo Serra · Krefeld, DE
• Matthias Ehlers · Marne, DE
• Jeffrey Bolton · Mülheim an der Ruhr, DE
• Gary B. Solak · League City, US
• Kirk J. Bourgeois · Baytown, US
• Gregory L. McCullough · Highlands, US
• Amber Hicks · Pearland, US
• Richard G. Hillman · Houston, US
• James E. Sager · Highlands, US
• Xiaoyan Wang · League City, US
• Spotswood Miller · Friendswood, US
• Ralf Ochel · Seabrook, US
• Sara DeLucia · Pittsburgh, US

Key dates

• Filing date: Jun 26, 2006
• Grant date: Jun 16, 2009
• Expiry date: Jun 26, 2026

Classification

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

Abstract

Isocyanates are produced by reacting an organic amine with phosgene in process which includes at least three stages. The first stage is carried out in a dynamic mixer. The second stage is carried out in at least one reactor. The third stage is carried out in at least one material separating apparatus. The pressure in the reactor of the second stage must be greater than or equal to the pressure in the dynamic mixer. The pressure in the third stage material separating apparatus must be lower than the pressure in the second stage reactor.