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:
Sep. 26, 2006
Filed:
Apr. 04, 2001
Bernd Eck, Viernheim, DE;
Dieter Baumann, Walldorf, DE;
Jörg Heilek, Bammental, DE;
Klaus Joachim Müller-engel, Stutensee, DE;
Bernd Eck, Viernheim, DE;
Dieter Baumann, Walldorf, DE;
Jörg Heilek, Bammental, DE;
Klaus Joachim Müller-Engel, Stutensee, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
In a process for the purification of a crude acrylic acid melt, the crude acrylic acid melt is converted, under the action of low temperatures, into a crude acrylic acid suspension consisting of acrylic acid crystals and residual melt, and the acrylic acid crystals of the crude acrylic acid suspension are freed from remaining residual melt in a wash column, the production of the acrylic acid crystals of the crude acrylic acid suspension being carried out in the presence of water, the wash column being a wash column with forced transport of the acrylic acid crystals and the wash liquid used being the melt of acrylic acid crystals purified in the wash column.