The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 08, 2005
Filed:
Apr. 14, 2003
Michael Riedel, Bay City, TX (US);
Ernst Wiebus, Oberhausen, DE;
Carl D Frohning, Wesel, DE;
Wilfried Fenske, Hamminkeln, DE;
Florian Rampf, Burghausen, DE;
Jurgen Herwig, Hunxe, DE;
Helmut Bahrmann, Hamminkeln, DE;
Klaus Bergrath, Oberhausen, DE;
Wolfgang Zgorzel-ski, Oberhausen, DE;
Robert Eckl, Munich, DE;
Hans Bohnen, Moers, DE;
Richard Fischer, Oberhausen, DE;
Kurt Schalapski, Oberhausen, DE;
Wolfgang Greb, Dinslaken, DE;
Michael Riedel, Bay City, TX (US);
Ernst Wiebus, Oberhausen, DE;
Carl D Frohning, Wesel, DE;
Wilfried Fenske, Hamminkeln, DE;
Florian Rampf, Burghausen, DE;
Jurgen Herwig, Hunxe, DE;
Helmut Bahrmann, Hamminkeln, DE;
Klaus Bergrath, Oberhausen, DE;
Wolfgang Zgorzel-Ski, Oberhausen, DE;
Robert Eckl, Munich, DE;
Hans Bohnen, Moers, DE;
Richard Fischer, Oberhausen, DE;
Kurt Schalapski, Oberhausen, DE;
Wolfgang Greb, Dinslaken, DE;
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.