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. 11, 2012
Filed:
Dec. 09, 2009
Volker Schliephake, Schifferstadt, DE;
Thorsten Friese, Mannheim, DE;
Klaus Bott, Ludwigshafen, DE;
Michael Blechschmitt, Schifferstadt, DE;
Till Blum, Kuantan, MY;
Klaus Joachim Mueller-engel, Stutensee, DE;
Volker Schliephake, Schifferstadt, DE;
Thorsten Friese, Mannheim, DE;
Klaus Bott, Ludwigshafen, DE;
Michael Blechschmitt, Schifferstadt, DE;
Till Blum, Kuantan, MY;
Klaus Joachim Mueller-Engel, Stutensee, DE;
BASF SE, Ludwigshafen, DE;
Abstract
A process for redissociating Michael adducts which are present in a liquid F with a proportion by weight of ≧10% by weight and have been formed in the preparation of acrylic acid or esters thereof in a redissociating apparatus which comprises a pump P, a separating column K with separating internals and a circulation heat exchanger UW, wherein, for the purpose of supplying the cleavage energy, the pump P sucks in bottoms liquid from the bottom space of the separating column K and, via the circulation heat exchanger UW, continually recycles it into the bottom space above the level of the bottoms liquid, and wherein the pump P is a radial circulation pump with an open impeller.