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. 19, 2006
Filed:
Apr. 14, 2004
Volker Diehl, Ellerstadt, DE;
Ulrich Jaeger, Roemerberg, DE;
Ulrich Hammon, Mannheim, DE;
Juergen Schroeder, Ludwigshafen, DE;
Steffen Rissel, Kirchheim, DE;
Volker Diehl, Ellerstadt, DE;
Ulrich Jaeger, Roemerberg, DE;
Ulrich Hammon, Mannheim, DE;
Juergen Schroeder, Ludwigshafen, DE;
Steffen Rissel, Kirchheim, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
(Meth)acrylic monomers are separated by a thermal separation process by ascending at least one ascending gaseous stream in a separating column containing a sequence of mass transfer trays and a liquid stream that contains dissolved polymerization inhibitor which descends in the separating column, and in at least one of the streams being (meth)acrylic monomers; and spraying the inner surface of the separating column with the descending liquid stream that contains the dissolved polymerization inhibitor, and the separating column having internals, certain areas of which are shadow regions of the sprayed descending liquid stream; and which shadow regions are equipped by covering means which prevent contact of the shadow regions with (meth)acrylic monomers and consequently undesired polymerization of monomer.