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:
Oct. 17, 2023
Filed:
Jul. 24, 2019
Covestro Intellectual Property Gmbh & Co. KG, Leverkusen, DE;
Jens Langanke, Mechernich, DE;
Franz Beggel, Cologne, DE;
Gernot Jaeger, Cologne, DE;
Wolf Kloeckner, Cologne, DE;
Volker Michele, Cologne, DE;
Thomas Voessing, Düsseldorf, DE;
Covestro Intellectual Property Gmbh & Co. Kg, Leverkusen, DE;
Abstract
The invention relates to a method for producing aniline or an aniline derivative, in which a solution of aminobenzoic acid in aniline with a mass fraction of aniline in the solution, in relation to the total mass of aminobenzoic acid and aniline, in the region of 20% to 85%, is subject to a thermal decarboxylation at a temperature in the region of 165° C. to 500° C. without the presence of a non-system catalyst, such that the aminobenzoic acid is converted into aniline. The obtained aniline can be converted into derivatives, such as di- and polyamines of the diphenylmethane series.