Organic compounds -- part of the class 532-570 series – Organic compounds – Sulfonic acids or salts thereof
Patent
1991-09-23
1992-09-01
Dees, Jose G.
Organic compounds -- part of the class 532-570 series
Organic compounds
Sulfonic acids or salts thereof
C07B27300
Patent
active
051440644
ABSTRACT:
J-Acid urea of the formula ##STR1## is prepared by reacting 7-amino-4-hydroxynaphthalene-2-sulfonic acid (J-acid) with urea at from 100.degree. to 140.degree. C. under a pressure ranging from atmospheric pressure to 10 bar in an inert solvent to a partial extent, precipitating unconverted J-acid in an acidic medium and separating it off, and, if desired, isolating J-acid urea from the resulting neutralized solution by salting out.
REFERENCES:
patent: 675631 (1901-06-01), Israel et al.
patent: 4599203 (1986-07-01), Conrow et al.
Hahn Erwin
Mayer Udo
Raulfs Friedrich-Wilhelm
Schloesser Ulrike
BASF - Aktiengesellschaft
Dees Jos,e G.
MacMillan Keith D.
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