Method for purifying an organic solvent for the purposes of absorption of maleic acid anhydride

US6921830B2 · kind B2 · utility

Inventors

• Ralf-Thomas Rahn · Mannheim, DE
• Alexander Weck · Freinsheim, DE
• Gerd Kaibel · Lampertheim, DE

Key dates

• Filing date: Apr 22, 2002
• Grant date: Jul 26, 2005
• Expiry date: Aug 19, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C51/573
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

In a process for purifying an organic solvent for the absorption of maleic anhydride from a gaseous mixture, in which the maleic anhydride is separated off from the solvent, a substream is taken from the solvent stream, this substream is distilled and returned to the solvent circuit, the proposed improvement comprises separating off a low-boiling fraction and a high-boiling fraction from the fraction consisting essentially of purified solvent and feeding the fraction consisting essentially of purified solvent back into the solvent stream.