dye|World dye variety

Name:C.I.Direct Yellow 69,C.I.25340

Molecular Structure: Double azo class

C.I.Direct Yellow 69,C.I.25340,CAS 6391-32-8,984.74,C36H28N8Na4O16S2

Molecular Formula:C₃₆H₂₈N₈Na₄O₁₆S₂

Molecular Weight: 984.74

CAS Registry Number:6391-32-8

Manufacturing Methods : N,N’-bis(3-carboxy-4-aminophenyl)urea double nitriding, and 4-(3-Oxobutanamido)benzenesulfonic acid (0.35 Moore) and 4-Methoxy-2-(3-oxobutanamido)benzenesulfonic acid (1.65 Moore) coupled. Treatment with diketene 4-Methoxy-2-(3-oxobutanamido)benzenesulfonic acid mixed aqueous solution prepared by coupling the product.

Properties and Applications: yellow to dark yellow. Soluble in water for golden brown, slightly soluble in alcohol. The strong sulfuric acid for lemon yellow, diluted still for lemon yellow. The dye solution to join strong hydrochloric acid did not change; Add thick sodium hydroxide solution has not changed.

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