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:
May. 24, 2011
Filed:
Jul. 09, 2008
Joerg Heilek, Bammental, DE;
Ulrich Hammon, Mannheim, DE;
Klaus Joachim Mueller-engel, Stutensee, DE;
Dieter Baumann, Speyer, DE;
Joerg Heilek, Bammental, DE;
Ulrich Hammon, Mannheim, DE;
Klaus Joachim Mueller-Engel, Stutensee, DE;
Dieter Baumann, Speyer, DE;
BASF SE, Ludwigshafen, DE;
Abstract
A process for purifying removal of acrylic acid, methacrylic acid, N-vinylpyrrolidone or p-xylene crystals from their suspension in mother liquor by means of a wash column with forced transport, whose shell of the process chamber is a metal wall, the wash column additionally being enveloped by a thermal insulation material having a water vapor barrier and a specific heat flow of >0.1 W/mand <10 W/mflowing into the process chamber through the metal wall of the wash column.