Process for purifying off-gases of a melamine plant

US7311759B2 · kind B2 · utility

Assignee

• AMI Agrolinz Melamine International GmbH · AT

Inventors

• Frank Schröder · Obernburg, DE
• Hartmut Bucka · Staprijk, AT
• Christoph Neumüller · Ansfelden, AT
• Gerhard Coufal · Leonding, AT

Key dates

• Filing date: Nov 14, 2002
• Grant date: Dec 25, 2007
• Expiry date: Apr 2, 2024

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01D53/54
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A two-stage process is provided for purifying off-gases from a high-pressure melamine plant. In the first stage, the off-gases are contacted with a recirculated urea melt containing melamine precursors and NH3. In the second stage, the off-gases are contacted with a fresh urea melt.