Two-stage reactor for the production of melamine

US7253280B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Christian Kuhrs · Heidelberg, DE
• Eckehard Danz · Ludwigshafen, DE
• Wolfgang Steiner · Friedelsheim, DE
• Ralf-Thomas Rahn · Mannheim, DE
• Thomas Grassler · Schifferstadt, DE
• Reiner Geier · Mannheim, DE
• Klaus Harth · Altleiningen, DE
• Markus Hölzle · Tauberbischofsheim, DE

Key dates

• Filing date: Jan 16, 2004
• Grant date: Aug 7, 2007
• Expiry date: Jan 16, 2024

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D251/60
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for the catalytic preparation of melamine by decomposition of urea over particular solid catalysts using a main reactor and an after-reactor. A catalyst having a low Lewis acidity is used in the main reactor and a catalyst having an equal or preferably higher Lewis acidity is used in the after-reactor.