4051-63-2Relevant articles and documents
Method for efficiently preparing 4,4-diamino-1,1-dianthraquinone by using Bronsted acid functionalized ionic liquid
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Paragraph 0019; 0020; 0021; 0022; 0023, (2019/05/15)
The invention discloses a method for efficiently preparing 4,4-diamino-1,1-dianthraquinone by using Bronsted acid functionalized ionic liquid. The method comprises the steps: weighing the Bronsted acid functionalized ionic liquid, adding the weighed Bronsted acid functionalized ionic liquid into a reaction vessel, and heating the temperature of the Bronsted acid functionalized ionic liquid to a certain temperature; slowly adding sodium 4,4-diamino-1,1-dianthraquinone-3,3-disulfonate, carrying out a heated reaction for certain time with stirring, and cooling the temperature of a reacted substance to a certain temperature after the reaction ends up; dropwise adding a certain amount of organic solvent, carrying out uniform stirring, then, carrying out suction filtration, and washing the reacted substance with the solvent until the reacted substance is colorless; and subjecting a filter cake to vacuum drying, thereby obtaining the 4,4-diamino-1,1-dianthraquinone. According to the method, concentrated sulfuric acid is replaced with the Bronsted acid functionalized ionic liquid which serves as a reaction medium for producing the 4,4-diamino-1,1-dianthraquinone, no waste acid is discharged, the yield of the 4,4-diamino-1,1-dianthraquinone reaches up to 98% or more, and thus, the method is in line with general orientation of environment-friendly and cyclic development and has a broad application prospect.
Pigmentation process for paratonere 3BL
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Paragraph 0016, (2017/01/02)
The invention discloses a pigmentation process for paratonere 3BL. The process comprises the following steps: subjecting a crude 3BL product to dry ball milling in the presence of a grinding aid, an organic solvent and a dispersant for 4 to 5 h; after completion of ball milling, pouring a material obtained after ball milling into an aqueous medium containing a nonionic surfactant; maintaining a temperature of 70 to 80 DEG C for 1 to 2 h; and carrying out filtering washing and drying so as to obtain a finished 3BL product; wherein the addition amount of the grinding aid is 3 to 7 times the weight of the crude 3BL product, the addition amount of the organic solvent is 5 to 10% of the weight of the crude 3BL product, and the addition amount of the dispersant is 1 to 3% of the weight of the crude 3BL product. The pigmentation process for paratonere 3BL is simple in process steps and mild in reaction conditions, and uses easily available raw materials; and the prepared finished 3BL product has high strength, good dispersity, good glossiness and good stability. The finished 3BL product is applicable to blending of a variety of industrial paints and has brilliant colored light and good fluidity.
SOME RELATIONSHIPS IN THE SYNTHESIS OF BIARYLS FROM HALOGENOANTHRAQUINONES
Koshelev, V. I.,Paramonova, L. N.,Filippov, M. P.
, p. 557 - 562 (2007/10/02)
The effects of the solvent and the concentration of the reagents on the reaction path and on the results of the synthesis of biaryls from halogenoanthraquinones were investigated for the case of the reaction of 1-chloro-4-benzoylaminoanthraquinone with copper.The use of concentrated reaction mixtures and of donating aprotic dipolar solvents with copper-aryl halide ratios slightly exceeding an equimolar ratio leads to a reduction in the induction period and to an increase in the yield of the biaryls.This explained by interaction between the copmonents of the metal-aryl halide-solvent complex.