Process for the preparation of a concentrated aqueous reactive d

Details Process for the preparation of a concentrated aqueous reactive d Process for the preparation of a concentrated aqueous reactive d

1988-01-22

1988-11-08

Clingman, A. Lionel

Bleaching and dyeing; fluid treatment and chemical modification

Dye concentrate composition wherein an additional amount of...

8549, 8680, 8688, 8918, 8937, 544 75, 544 76, C09B 62503, C09B 1902, D06P 1384, D06P 366

Patent

active

047831952

ABSTRACT:
A process for the preparation of a concentrated storage-stable aqueous solution of the dyestuff of the formula ##STR1## is characterized in that the reaction mixture obtainable from the quinone derivative of the formula ##STR2## by sulphation and subsequent oxidation cyclization, preferably with ammonium, sodium or potassium peroxodisulphate, in oleum is diluted with water or sulphuric acid to a sulphuric acid concentration of 37-50%, preferably 41-43%, and the product which thereby precipitates is separated off and brought to a pH of about 2-6, preferably 3-4, in water with basic lithium compounds, preferably lithium carbonate or lithium hydroxide.

REFERENCES:
patent: 3883523 (1975-05-01), Parton
patent: 3892742 (1975-07-01), Parton
patent: 4577015 (1986-03-01), Jager et al.
patent: 4578461 (1986-03-01), Jager

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