Method for producing aniline or an aniline derivative

US11788107B2 · kind B2 · utility

Assignee

• Covestro Intellectual Property GmbH & Co. KG · DE

Inventors

• Jens Langanke · Mechernich, DE
• Franz Beggel · Cologne, DE
• Gernot Jaeger · Cologne, DE
• Wolf Kloeckner · Cologne, DE
• Volker Michele · Cologne, DE
• Thomas Voessing · Düsseldorf, DE

Key dates

• Filing date: Jul 24, 2019
• Grant date: Oct 17, 2023
• Expiry date: Nov 30, 2040

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B29/0003
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

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.