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:
Nov. 19, 2019
Filed:
Aug. 11, 2014
Evonik Degussa Gmbh, Essen, DE;
Jürgen Mosler, Marl, DE;
Christian Psiorz, Ratingen, DE;
Franz-Felix Kuppinger, Marl, DE;
Raphael Schriewer, Laer, DE;
Arnd Bruhns, Borgholzhausen, DE;
Armin Rix, Marl, DE;
Peter Kreis, Dortmund, DE;
Ralf Meier, Dortmund, DE;
James Edward Elder, Friendswood, TX (US);
Evonik Degussa GmbH, Essen, DE;
Abstract
The present invention provides an apparatus comprising a feed arranged below the middle of the apparatus, a quenching agent inlet arranged above the feed, an outlet arranged below the feed and a draw arranged above the quenching agent inlet, the apparatus having a region provided with one or more packing elements, wherein at least one means which ensures the formation of a liquid layer having a height of at least 1 cm is present between the quenching agent inlet and a packing element present between the quenching agent inlet and feed. The present invention also provides a process for preparing acrylic acid, which includes a step of oxidizing acrolein, wherein the reaction mixture obtained in this oxidation is contacted with water as quenching agent in an inventive apparatus, and a composition obtainable as bottom product in the process according to the invention, comprising acrylic acid and water.