1,4 dihydroxy anthraquinone quinizirine(CAS No.81-64-1)
Melting point: 195–200 °C
Boiling point: 450 °C
Density: 1.3032 (rough estimate)
Bulk density: 350 kg/m³
Vapor density: 8.3 (vs air)
Vapor pressure: 1 mmHg (196.7 °C)
Refractive index: 1.5430 (eChemicalbook estimate)
Flash point: 222 °C
Storage conditions: Store below +30 °C.
Solubility: <1 g/L
Acid dissociation constant (pKa): pK(18°) 9.51
Color index: 58050
Form: Powder
Color: Brownish red
Water solubility: <1 g/L (20 °C)
Q1
What is Quinizarin?
A1
Quinizarin is the common name for 1,4-dihydroxyanthraquinone, an anthraquinone derivative with molecular formula C₁₄H₈O₄. It is a red crystalline solid, widely used as an intermediate for dyestuffs, pigments, analytical reagents and colorants.
Q2
What are its physical properties?
A2
It appears as red to orange-red crystals. Slightly soluble in cold water, soluble in hot water, ethanol, ether, benzene, and alkaline aqueous solutions. It shows distinct color change in alkali: turns violet-red. Melting point around 194–196 °C.
Q3
What are the main applications?
A3
1.Key intermediate for manufacturing anthraquinone disperse dyes, acid dyes, reactive dyes and vat dyes;
2.Raw material for producing solvent dyes and organic pigments;
3.Used as an acid-base indicator and metal complexing reagent in analytical chemistry;
4.Precursor for synthesis of substituted anthraquinone derivatives.
2.Raw material for producing solvent dyes and organic pigments;
3.Used as an acid-base indicator and metal complexing reagent in analytical chemistry;
4.Precursor for synthesis of substituted anthraquinone derivatives.