Method for the production of N,N-dimethylacetamide (DMAC)

US8193390B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Horst Grafmans · Bad Dürkheim, DE
• Steffen Maas · Bubenheim, DE
• Alexander Weck · Freinsheim, DE
• Heinz Rutter · Hochdorf-Assenheim, DE
• Michael Schulz · Ludwigshafen, DE
• Karl-Heinz Roβ · Bad Kötzting, DE

Key dates

• Filing date: Dec 3, 2005
• Grant date: Jun 5, 2012
• Expiry date: May 5, 2029

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C231/02
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for preparing N,N-dimethylacetamide (DMAC) by continuously reacting methyl acetate (MeOAc) with dimethylamine (DMA) in the presence of a basic catalyst, wherein MeOAc is used in the form of a methanolic solution and the continuous distillative workup is effected in such a way that methanol and any other low boilers are initially removed overhead in a column A and the bottom effluent of column A is fed to a column B in which DMAC is removed via a side draw a purity of ≧99.7% by weight.