Hydroquinone

Chinese name

Hydroquinone

Foreign name

Hydroquinone

Alias

Hydroquinone, 1,4-benzenediol

Chemical formula

C6H6O2

Molecular weight

110.111

CAS registration number

123-31-9

EINECS number

204-617-8

Melting point

172 to 175 °C

Boiling point

286 °C

Density

1.328 g/cm³

Appearance

White crystalline powder

Flash point

141.6 ℃

Application

Black and white developer, anthraquinone dyes, azo dyes, rubber antioxidant, stabilizer and antioxidant

Safety description

S26; S36/37/39; S61

Hazard Symbols

Xn; N

Hazard Description

r22; r40; r41; r43; r50; r68

UN Dangerous Goods Number

2662

Soluble in alcohols and ethers, soluble in water, slightly soluble in benzene. Easily turns light red when exposed to light in air. Aqueous solution can be oxidized to brown in air.

The seven roles and uses of hydroquinone

1. Used as a developer, used as analytical reagent, copper, gold reducer and developer

2. Used as an antioxidant for rubber and gasoline, etc.

3. Colorimetric method for the determination of phosphorus, magnesium, niobium, copper, silicon and arsenic, etc. Determination of iridium by polarimetry and volumetric method. Reducing agent of heteropolyacid, copper and gold Determination of phosphate, tungstate, nitrate, nitrite, selenium and tellurium, etc.

4. Photometric determination of phosphorus, magnesium, niobium, copper, silicon and arsenic, etc.; polarimetric and volumetric determination of iridium; reducing agent of heteropolyacid; reducing agent of copper and gold; testing phosphate, tungstate, nitrate, nitrite, selenium and tellurium, etc.; antioxidant; desulfurization agent of fertilizer industry; urea synergist

5. hydroquinone and its alkylates are widely used as a polymerization inhibitor added during the storage and transportation of monomers, commonly used at a concentration of about 200 ppm. as a polymerization inhibitor, using its antioxidant properties, hydroquinone can prevent the polymerization of acrylic acid, methyl methacrylate, cyanoacrylate and other monomers susceptible to free radical-initiated polymerization.

6. It is the raw material for manufacturing anthraquinone dyes, azo dyes and other dyes; it can also be used as corrosion inhibitor, stabilizer and antioxidant for detergents, etc. It is also used as hair dye for cosmetics

7. Hydroquinone is an intermediate of herbicides quinclorac, imidacloprid, thiazolyl, oxazachlor, fluroxypyr, lactofluorocarb, and is also a pharmaceutical and dye intermediate

8, treatment field, hydroquinone is added in hot water and cooling water of closed circuit heating and cooling system, which can play a role in corrosion inhibition for water-side metal. Hydroquinone is used as deaerator of furnace water, and hydroquinone is added to it when boiler water is preheated and deaerated to remove residual dissolved oxygen.