Dye|Dye intermediates|Fluorescent Brightener|pigment dye

Name:C.I.Fluorescent Brightener 74,C.I.45550

Molecular Structure: Xanthene

C.I.Fluorescent Brightener 74,C.I.45550,CAS 81-37-8,296.36,C22H16O

Molecular Formula:C₂₂H₁₆O

Molecular Weight: 296.36

CAS Registry Number:81-37-8

Manufacturing Methods : p-Cresol (2 Moore) and Phthalic anhydride (1 Moore) condensation get 2′,7′-dimethyl-fluoran, at 24% fuming sulfuric acid central change, its product with zinc and ammonia in the pressure reduction get brightening agent, and then in 250 ~ 280 ℃ / 1 ~ 2 mm sublimation refined.

Properties and Applications:green yellow. Insoluble in water, to the organic solvent stability.

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