Process for preparing sulfonated arylphosphines

US6864387B2 · kind B2 · utility

Assignee

• CELANESE CHEMICALS EUROPE GMBH · DE

Inventors

• Michael Riedel · Essen, DE
• Ernst Wiebus · Oberhausen, DE
• Carl D. Frohning · Wesel, DE
• Wilfried Fenske · Hamminkeln, DE
• Florian Rampf · Burghausen, DE
• Jurgen Herwig
• Helmut Bahrmann · Hamminkeln, DE
• Klaus Bergrath · Oberhausen, DE
• Wolfgang Zgorzel-Ski · Oberhausen, DE
• Robert Eckl · Munich, DE
• Hans Bohnen · Niedernhausen, DE
• Richard Fischer · Hartland, US
• Kurt Schalapski · Oberhausen, DE
• Wolfgang Greb · Dinslaken, DE

Key dates

• Filing date: Apr 14, 2003
• Grant date: Mar 8, 2005
• Expiry date: Apr 14, 2023

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J2531/96
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for preparing solutions of sulfonated arylphosphines comprising reacting arylphosphines with oleum, diluting the sulfonation mixture with water, extracting the diluted sulfonation mixture with a solution of a water-insoluble organic solvent, reacting the organic phase with a solution of an inorganic base in water, adjusting the resulting aqueous solutin of sulfonated arylphosphines to a pH of up to 3 by addition of an acid, and passing an inert gas stream through the aqueous solution comprising sulfonated arylphosphines until sulfur is no longer liberated from the aqueous solution of sulfonated arylphosphines.