Celanese Chemicals Europe Gmbh

Celanese Gmbh

Michael Riedel

Helmut Bahrmann

Klaus Bergrath

Ernst Wiebus

Carl Dieter Frohning

Robert Eckl

Wilfried Fenske

Florian Rampf

Wolfgang Zgorzel-Ski

Hans Bohnen

Kurt Schalapski

Wolfgang Greb

Richard Fischer

Wolfgang Zgorzelski

Othmar Stelzer

Michael Tepper

Harald Dibowski

Antonella Hessler

Franz Peter Schmidtchen

Michael Messerschmidt

A process for preparing sulfonated arylphosphines by reaction of arylphosphines with oleum, wherein, after reaction of the arylphosphines with oleum, the sulfonation mixture is firstly diluted with water, an inert gas stream is then passed through the diluted sulfonation mixture until SOis no longer liberated from the diluted sulfonation mixture and the latter is then worked up further in a customary manner and its use.

Process for preparing sulfonated arylphosphines

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.

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 SO 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, treated as defined by the invention, for carrying out the hydroformylation of olefinically unsaturated compounds, and relates to the use thereof for carrying out the same.

Method for producing sulfonated aryl phosphines

Guanidinium phosphanes, their production and their use

A method of stabilizing aliphatic C.sub.3 -C.sub.14 -aldehydes against polymerization and autocondensation by the addition of alkaline substances to the aldehydes wherein the alkaline substances used are alkali metal hydroxides, alkaline earth metal hydroxides, alkali metal carbonates, alkaline earth metal carbonates or alkali metal carboxylates which are added to the aldehyde to be stabilized in amounts of 0.05-20 ppm, based on the aldehyde.

Method of stabilizing aldehydes

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Bay City, TX, United States of America

Michael Riedel