Process for preparing toluenediamine by hydrogenation of dinitrotoluene

US8609899B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Andreas Raichle · Ludwigshafen, DE
• Joana Coelho Tsou · Heidelberg, DE
• Samuel Neto · Brussels, BE
• Ulrich Penzel · Lauscha, DE
• Steffen Oehlenschlaeger · Ludwigshafen, DE
• Michael Zoellinger · Eislingen/Fils, DE
• Holgar Braunsberg · Senftenberg - Zły Komorow, DE
• Stefanie Haase · Pulsnitz, DE
• Johannes Buettner · Ruhland, DE

Key dates

• Filing date: May 17, 2011
• Grant date: Dec 17, 2013
• Expiry date: May 30, 2031

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C209/36
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to a process for the continuous preparation of toluenediamine by liquid-phase hydrogenation of dinitrotoluene by means of hydrogen in the presence of a suspended, nickel-comprising catalyst in a reactor with a product isolation unit downstream of the reactor to give a product output from the reactor comprising a liquid phase comprising toluenediamine and dinitrotoluene, in which the nickel-comprising catalyst is suspended, wherein the concentration of dinitrotoluene in the liquid phase of the product output from the reactor in the region between the reactor and the downstream product isolation unit is set to a value in the range from 1 to 200 ppm by weight, based on the total weight of the liquid phase of the product output from the reactor.