Method for producing sulfonated aryl phosphines

US6610881B1 · kind B1 · utility

Assignee

• CELANESE CHEMICALS EUROPE GMBH · DE

Inventors

• Michael Riedel · Essen, DE
• Jurgen Herwig
• Helmut Bahrmann · Hamminkeln, DE
• Klaus Bergrath · Oberhausen, DE
• Wolfgang Zgorzel-Ski · Oberhausen, DE
• Robert Eckl · Munich, DE
• Ernst Wiebus · Oberhausen, DE
• Carl D. Frohning · Wesel, DE
• Wilfried Fenske · Hamminkeln, DE
• Florian Rampf · Burghausen, DE

Key dates

• Filing date: Dec 12, 2001
• Grant date: Aug 26, 2003
• Expiry date: Dec 12, 2021

Classification

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

Abstract

The invention relates to a method for producing sulfonated aryl phosphines by reacting aryl phosphines with oleum. After reacting the aryl phosphines with oleum, the sulfonation mixture is firstly diluted with water and an inert gas stream is then fed through the diluted sulfonation mixture until SO2 is no longer released from the diluted sulfonation mixture. Afterwards, the sulfonation mixture is subsequently processed in a usual manner. The invention also relates to a method for producing solutions of sulfonated aryl phosphines by reacting the aryl phosphines with oleum, diluting the sulfonation mixture with water, extracting the aqueous solution using an organic solution consisting of an amine, and subsequently carrying out a reextraction using an aqueous solution having an inorganic base. According to the invention, the solution containing aqueous sulfonated aryl phosphines is adjusted to a pH value of up to 3 by adding acid, and an inert gas stream is then fed through the aqueous solution until sulfur dioxide is no longer released. The invention additionally relates to an aqueous catalyst solution containing rhodium and an aqueous solution of sulfonated aryl phosphines, treate…