Method for separating formic acid from a reaction mixture by means of extraction

US10689320B2 · kind B2 · utility

Assignee

• OXFA GMBH · DE

Inventors

• Hermann Wolf Jbach · Remscheid, DE
• Florian Kohler · Nuremberg, DE
• Matthias Schmidt · Munich, DE
• Gunthard Scholz · Gundelsheim, DE
• Martin Dirauf · Ebensfeld, DE

Key dates

• Filing date: Jul 17, 2017
• Grant date: Jun 23, 2020
• Expiry date: Jul 17, 2037

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J2523/68
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to a method for separating formic acid from a reaction mixture by means of extraction, wherein, in addition to the formic acid, the reaction mixture comprises a polyoxometalate ion of general formula [PMoxVyO40]n− as a catalyst and a solvent that dissolves the catalyst, wherein 6≤x≤11, 1≤6, x+y=12 and 3<n<10, wherein n, x, and y are each a whole number, wherein the separation occurs via extraction by means of a polar organic extraction agent which extracts the formic acid and the catalyst and which is N-(n-hexadecyl)formamide, N-di-n-acetamide or an N,N-dialkylcarboxamide, wherein the N,N-dialkylcarboxamide forms a phase boundary between the solvent and the extraction agent during mixing with the solvent.