The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 17, 2013
Filed:
May. 17, 2011
Andreas Raichle, Dresden, DE;
Joana Coelho Tsou, Bruessel, BE;
Samuel Neto, Brussels, BE;
Ulrich Penzel, Tettau, DE;
Steffen Oehlenschlaeger, Antwerp, BE;
Michael Zoellinger, Eislingen, DE;
Holgar Braunsberg, Senftenberg, DE;
Stefanie Haase, Bretnig-Hauswalde, DE;
Johannes Buettner, Ruhland, DE;
Andreas Raichle, Dresden, DE;
Joana Coelho Tsou, Bruessel, BE;
Samuel Neto, Brussels, BE;
Ulrich Penzel, Tettau, DE;
Steffen Oehlenschlaeger, Antwerp, BE;
Michael Zoellinger, Eislingen, DE;
Holgar Braunsberg, Senftenberg, DE;
Stefanie Haase, Bretnig-Hauswalde, DE;
Johannes Buettner, Ruhland, DE;
BASF SE, Ludwigshafen, DE;
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.