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:
Jun. 24, 2014
Filed:
Oct. 30, 2013
Caspar Heinrich Finkeldei, Alzenau, DE;
Pablo Zacchi, Bruchkoebel, DE;
Benjamin Fonfe, Frankfurt, DE;
Stephan Kretz, Biebergemuend, DE;
Martin Koerfer, Kahl, DE;
Hans Joachim Hasselbach, Gelnhausen, DE;
Wolfgang Boeck, Langenselbold, DE;
Caspar Heinrich Finkeldei, Alzenau, DE;
Pablo Zacchi, Bruchkoebel, DE;
Benjamin Fonfe, Frankfurt, DE;
Stephan Kretz, Biebergemuend, DE;
Martin Koerfer, Kahl, DE;
Hans Joachim Hasselbach, Gelnhausen, DE;
Wolfgang Boeck, Langenselbold, DE;
Evonik Degussa GmbH, Essen, DE;
Abstract
A process for preparing methylmercaptopropionaldehyde in a single reaction unit, is provided. According to the preferred embodiment, the process comprises, simultaneously contacting a gaseous mixture comprising acrolein with a liquid mixture comprising methylmercaptopropionaldehyde, methyl mercaptan, a catalyst and methylmercaptopropionaldehyde methyl thiohemiacetal in the reactive absorber; absorbing the acrolein from the gaseous mixture into the liquid mixture; reacting the absorbed acrolein with the methyl mercaptan or the methylmercaptopropionaldehyde methyl thiohemiacetal to obtain methylmercapto-propionaldehyde; removing gaseous impurities and by-products from the liquid mixture; and separating the obtained methylmercaptopropionaldehyde product from the reactive absorber, directing a portion of the separated product to storage or further processing and recycling the remaining portion to the reactive absorber; wherein the methyl mercaptan optionally comprises dimethyl sulfide or dimethyl ether.