dye|World dye variety

Name:C.I.Direct Red 37,C.I.22240

Molecular Structure: Double azo class

C.I.Direct Red 37,C.I.22240,CAS 3530-19-6,676.63,C30H22N4Na2O8S2,Direct Scarlet B New,Direct Scarlet B

Molecular Formula:C₃₀H₂₂N₄Na₂O₈S₂

Molecular Weight: 676.63

CAS Registry Number:3530-19-6

Manufacturing Methods :  4-(4-Aminophenyl)benzenamine double nitriding, first and 7-Hydroxynaphthalene-1,3-disulfonic acid coupling, again with phenol coupling, and then in contain sodium carbonate in aqueous solution of ethanol heating, air pressure,Using Chloroethane to make phenol  hydroxy ethylated .

Properties and Applications:  red. Soluble in water for red, slightly soluble in alcohol, acetone and soluble fiber element, insoluble in other organic solvents. The strong sulfuric acid for dark purple, after diluted brown precipitation; In nitric acid solution for colourful red. The dye solution to join strong hydrochloric acid have orange brown precipitation; Add thick sodium hydroxide solution for red orange, precipitation.

List of Suppliers:

Apollo Direct Scarlet B New( Taiheung Corp )

Shikiso Direct Scarlet B( Kaseihin Kogyo Kyokai )