dye|World dye variety

Name:C.I.Food Blue 4,C.I.69800

Molecular Structure: anthraquinones

C.I.Food Blue 4,C.I.69800,CAS 81-77-6,442.42,C28H14N2O4

Molecular Formula:C₂₈H₁₄N₂O₄

Molecular Weight: 442.42

CAS Registry Number:81-77-6

Manufacturing Methods :(a) in potassium nitrate, LvSuanJia, glucose or organic acid salt (such as formic acid potassium or acetic acid potassium or the mixture of both) under the existence of, with potassium hydroxide treatment 2-Aminoanthracene-9,10-dione;

(b) in ethanol with potassium hydroxide treatment 2-Aminoanthracene-9,10-dione, and bring the mixture to the exposed to the air;

(c) in the presence of copper chloride, 2 molecules 1-Amino-2-bromoanthracene-9,10-dione  condensation;

(d) 8-Nitro-9,10-dioxo-9,10-dihydroanthracene-1-sulfonic acid reductive into 8-hydroxyl amino-1-anthraquinone sulfonic acid, and then into a blue anthracene ketone two sulfonic acid, then take off sulfonic acid base. Note: this dye with sodium hydroxide and glucose part reduction, again with air oxidation or soluble in sulfuric acid, and precipitation, made of extremely fine diffuse.

Properties and Applications:  red light blue. Slightly soluble in chloroform (heat), o-chlorophenol,Quinoline, insoluble in acetic acid, acetone, ethanol, pyridine, toluene, xylene. The strong sulfuric acid for brown, after diluted blue precipitation; In alkaline insurance powder solution for blue, acidic solutions for the red light in blue. And C.I. Vat  Blue 4, C.I. Pigment Blue 60 the same chemical structure.

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