Patent · US Active

Method for treating a substance mixture comprising an aromatic amine, in particular a substance mixture of raw aniline

US9682917B2 · kind B2 · utility

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9Claims

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Assignee

Covestro Deutschland AG · DE

Inventors

Michael Merkel · Hof, DE
Thomas Knauf · Dormagen, DE
Cliff Andre Peters · Marne, DE
Thorsten Schmidt · Horgen, CH

Key dates

Filing date	Apr 29, 2013
Grant date	Jun 20, 2017
Priority date	—
Expiry date	Apr 29, 2033

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C209/84
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

The present invention relates to a method for treating a substance mixture comprising an aromatic amine, wherein the aromatic amine is aniline or 2,4-diaminotoluene, preferably aniline. The substance mixture comprises an aromatic amine and compounds having a higher boiling point than the aromatic amine. The method for treating the substance mixture requires I) separating the first substance mixture by means of distillation in a first distillation unit (110, 1130), to at least partially remove some of the aromatic amine in the process, and to obtain a first bottom product which is removed from the first distillation unit (110, 1130). After removal from the first distillation unit (110, 1130), the bottom product is diluted with a condensed top product from a distillation unit that is different from the first distillation unit and/or with a composition that comprises methanol.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.