Process for preparing sulfonated arylphosphines
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United States of America Patent
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Mar 8, 2005
Grant Date -
Jan 29, 2004
app pub date -
Apr 14, 2003
filing date -
Apr 22, 1999
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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.
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