Process for the purification of wastewater from the aldolization reaction

US6358419B1 · kind B1 · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Mariola Rötzheim · Mülheim, DE
• Wolfgang Greb · Dinslaken, DE
• Wolfgang Zgorzelski · Oberhausen, DE
• Carl D. Frohning · Wesel, DE
• Klaus Denkmann · Oberhausen, DE
• Heinz Kalbfell · Schermbeck, DE

Key dates

• Filing date: May 1, 1996
• Grant date: Mar 19, 2002
• Expiry date: May 1, 2016

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S210/909
• WIPO field: Environmental technology
• WIPO sector: Chemistry

Abstract

Wastewater from the aldolization reaction is purified by adjusting its pH to 0 to 6, followed by extraction with monohydric alcohols having at least 8 carbon atoms, hydrocarbons having at least 6 carbon atoms, and mixtures thereof. In some cases, adjustment of the pH causes the formation of an organic phase, which is separated from the remaining wastewater before extraction.