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:
Jan. 06, 2004
Filed:
Jul. 05, 2002
Thomas Ostrowski, Castrop-Rauxel, DE;
Kathrin Harre, Dresden, DE;
Peter Zehner, Ludwigshafen, DE;
Jörn Müller, Ludwigshafen, DE;
Dieter Stützer, Dudenhofen, DE;
Georg Heinrich Grosch, Bad Dürkheim, DE;
Jürgen Winkler, Schwarzheide, DE;
Stephan Bauer, Ostercappeln, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
Polyetherpolyols are prepared by reacting diols or polyols with ethylene oxide, propylene oxide, butylene oxide or a mixture thereof in the presence of a multimetal cyanide complex catalyst by a process which is carried out in a vertical upright cylindrical reactor comprising a jet nozzle which is arranged in the upper reactor region and is directed downward and via which the starting materials and the reaction mixture are fed in, and comprising a take-off, preferably in the lower reactor region, via which the reaction mixture is fed back to the jet nozzle in an external circulation by means of a pump via an equilibration container, comprising a concentric guide tube which extends over the total length of the reactor, except for the reactor ends, and comprising a heat exchanger integrated in the annular space.