Method of purifying a raw melt of at least one monomer by crystallization

US7319166B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Ulrich Hammon · Mannheim, DE
• Bernd Eck · Viernheim, DE
• Dieter Baumann · Greven, DE
• Joerg Heilek · Bammental, DE
• Klaus Joachim Mueller-Engel · Blankenloch, DE

Key dates

• Filing date: May 2, 2002
• Grant date: Jan 15, 2008
• Expiry date: May 23, 2024

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C51/43
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to a method for purifying a raw melt of at least one monomer by crystallization, wherein suspension crystallization is initially used and the resulting remaining melt or the suspension crystals that have been molten once again and separated are subjected to a mechanical separation operation before undergoing subsequent purification by crystallization.