Method for the continuous production of N-methyl-2-pyrrolidone (NMP)

US7227029B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Martin Rudloff · Bad Dürkheim, DE
• Peter Stops · Altrip, DE
• Erhard Henkes · Lorsch, DE
• Helmut Schmidtke · Bensheim, DE
• Rolf Fischer · Heidelberg, DE
• Manfred Julius · Schifferstadt, DE
• Rolf Lebkucher · Mannheim, DE
• Karl-Heinz Ross · Grünstadt, DE

Key dates

• Filing date: Nov 15, 2002
• Grant date: Jun 5, 2007
• Expiry date: Apr 11, 2024

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D207/267
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Process for the continuous preparation of N-methyl-2-pyrrolidone (NMP) by reacting gamma-butyrolactone (GBL) with monomethylamine (MMA) in the liquid phase, wherein GBL and MMA are used in a molar ratio of from 1:1.08 to 1:2 and the reaction is carried out at from 320 to 380° C. and an absolute pressure of from 70 to 120 bar.