1,4-Hydroxyanthraquinone CAS 81-64-1
Appearance and properties: orange or red crystalline powder
Density: 1.54 g/cm3
Boiling point: 450 °C
Melting point: 198-199 °C(lit.)
Flash point: 222 °C
Refractive index: 1.732
Water solubility: <1 g/L (20 ºC)
Stability: Stable under normal temperatures and pressures.
Storage conditions: Keep container closed when not in use. Store in a cool, dry, well-ventilated area away from incompatible substances.
Vapor density: 8.3 (vs air)
Vapor pressure: 1 mm Hg (196.7 °C)
1,4-Dihydroxyanthraquinone, also called quinizarin or Solvent Orange 86, is an organic compound derived from anthroquinone. Quinizarin is an orange or red-brown crystalline powder. It is formally derived from anthraquinone by replacement of two hydrogen atoms by hydroxyl (OH) groups. It is one of ten dihydroxyanthraquinone isomers and occurs in small amounts (as a glycoside) in the root of the madder plant, Rubia tinctorum.
This product is an important dye intermediate. Disperse Brown GL itself (C.I. 58050). It is used to produce disperse blue SR, disperse blue B, disperse dark blue RB, disperse blue H3R, disperse blue 5R, disperse blue FFR, disperse dye orange GL, transparent blue, vat gray BG, vat brown BR, etc.; also can be used to produce weak acid bright Blue RAW, Weak Acid Green GS, Weak Acid Bright Yellow G, Weak Acid Brilliant Blue RAW, Acid Green P-3B, Acid Medium Gray BS, Acid Anthraquinone Blue R and intermediates used to produce 1,4-diaminoanthraquinone dye intermediates. 1,4-Dihydroxyanthraquinone-2-sulfonic acid can be obtained by sulfonation of 1,4-dihydroxyquinone.
