Organic compounds -- part of the class 532-570 series – Organic compounds – Azo
Patent
1984-09-11
1986-10-14
Higel, Floyd D.
Organic compounds -- part of the class 532-570 series
Organic compounds
Azo
8604, 8662, 8664, 8682, 534571, 534582, 534583, 534689, 534728, 534887, C09B 2700, C09B 4600, D06P 190
Patent
active
046173811
ABSTRACT:
A process is disclosed for the preparation of concentrated stable liquid dye solutions of CI Direct Yellow 11 starting with the product of the basic condensation of para-nitrotoluene-ortho-sulfonic acid in the form of its tetrasodium reaction mass or the wet filter cake separation of the solids from said mass and the reaction liquids or the dry technical grade sodium complex which is the dried filter cake. The solid starting material is suspended in a lower alkanol/water medium; the suspension is acidified to a pH below about 2.5 to acidify each sulfo moiety on the chromophore and to form the free inorganic salt; this acidified suspension is heated to assure completion of the metathetical salt-forming reaction; after sufficient heating, the mixture of the acidified chromophore and the salt is neutralized to a pH in the range 6.0 to 7.5 with an alkanolamine from an alcohol of from 2 to 5 carbon atoms in which the acidified chromophore is soluble by virtue of forming a water-soluble alkanolamine complex and forming a precipitate of the salt which is insoluble in the alkanol/water mixture; lastly the salt is removed from the solution which is concentrated by distilling of the alkanol and water.
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Cleverdon Jo A.
Hinson James W.
Ciba-Geigy Corporation
Higel Floyd D.
Jorda Karl F.
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