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:
Jun. 24, 2014
Filed:
Jun. 16, 2010
Heiner Schelling, Kirchheim, DE;
Ulrich Penzel, Tettau, DE;
Eckhard Stroefer, Mannheim, DE;
Matthias Eiermann, Limburgerhof, DE;
Jon S. Speier, Baton Rouge, LA (US);
Kai Thiele, Antwerp, BE;
Michael Bock, Ruppertsberg, DE;
Heiner Schelling, Kirchheim, DE;
Ulrich Penzel, Tettau, DE;
Eckhard Stroefer, Mannheim, DE;
Matthias Eiermann, Limburgerhof, DE;
Jon S. Speier, Baton Rouge, LA (US);
Kai Thiele, Antwerp, BE;
Michael Bock, Ruppertsberg, DE;
BASF SE, Ludwigshafen, DE;
Abstract
The present invention relates to a process for the production of isocyanates, preferably diisocyanates and polyisocyanates of the diphenylmethane series (MDI), by reacting an amine with phosgene in the liquid phase or in the gas phase to form the corresponding isocyanates, subsequent removal of the solvent in at least two steps to obtain at least two solvent streams, individual treatment of the at least two solvent streams, and recirculation of at least a portion of the solvent streams.