Process for the polynitration of aromatic compounds

US5616818A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Hans-Georg Pirkl · Leverkusen, DE
• Reinhard Schom acker · Leverkusen, DE
• Uwe Klingler · Dormagen, DE
• Thomas Schieb · Rösrath, DE
• Gerhard Wiechers · Leverkusen, DE
• J urgen Zimmermann · Walnut Creek, US

Key dates

• Filing date: Oct 13, 1995
• Grant date: Apr 1, 1997
• Expiry date: Oct 13, 2015

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P20/582
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

An aromatic compound is polynitrated in a continuous process in a single apparatus under adiabatic conditions in an emulsion as the reaction medium. From 1.3 to 3.5 mol of HNO.sub.3 per mol of aromatic compound are introduced in the form of a nitronium ion solution into the reactor with the aromatic compound under conditions such that an emulsion forms. The emulsion, which has a tendency to coalesce, is maintained by repeated dispersion. The first dispersion of the liquid streams to produce the emulsion takes place in less than one second. At least 20% of the total amount of HNO.sub.3 to be used should generally be present during this first dispersion. It is preferred, however, that the total amount of nitronium ion solution to be used be present at the time the aromatic compound and nitronium ion solution are first dispersed.