Method for thermal stabilization of highly concentrated formaldehyde solutions

US7273955B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Eckard Stroefer · Mannheim, DE
• Thomas Grützner · Stuttgart, DE
• Hans Hasse · Kaiserslautern, DE

Key dates

• Filing date: Mar 4, 2004
• Grant date: Sep 25, 2007
• Expiry date: Jul 27, 2024

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C45/82
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Method of stabilizing high-concentration formaldehyde solutions having a CH2O content of >70% by weight against precipitation of solids, which comprises heating the high-concentration formaldehyde solution at a heating rate of at least 5° C./min to a temperature of from 80° C. to 200° C. immediately after it has been prepared and storing it at a temperature in this range.