Organic compounds -- part of the class 532-570 series – Organic compounds – Sulfonic acids or salts thereof
Reexamination Certificate
2005-03-08
2005-03-08
Richter, Johann R. (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Sulfonic acids or salts thereof
C562S030000, C568S013000
Reexamination Certificate
active
06864387
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.
REFERENCES:
patent: 4710321 (1987-12-01), Bahrmann et al.
patent: 5274183 (1993-12-01), Herrman et al.
patent: 5347045 (1994-09-01), Herrmann et al.
patent: 5684182 (1997-11-01), Naumann et al.
patent: 5847200 (1998-12-01), Bahrmann et al.
patent: 5925785 (1999-07-01), Stelzer et al.
patent: 6613939 (2003-09-01), Aouni et al.
CA:69:86252 abs of Industrial and Engineering Chemistry Product Research and Devel. by Tucci, Raymond 7(3) pp 227-8, 1968.*
CA:108::211031 abs of Journal of Molecular Catalysis by Larpent et al 44(2) pp 191-5 1988.
Bahrmann Helmut
Bergrath Klaus
Bohnen Hans
Eckl Robert
Fenske Wilfried
Celanese Chemicals Europe GmbH
Muserlian Lucas and Mercanti
Puttlitz Karl
Richter Johann R.
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