Properties and Manufacturing process of Hydroquinone

1. Chemical name: hydroquinone; Quinol; 1,4-Benzenediol or 1,4-Dihydroxybenzene

2. Traits of Hydroquinone:

Hydroquinone is white needle crystal, molecular formula was C6H6O2, molecular weight 110.11, weight 1.332, melting point 172 ℃, boiling point 286 ℃, flash point 165 ℃ , soluble in water, alcohol and ether, slightly soluble in benzene.

3. Main uses of Hydroquinone:

Hydroquinone (CAS NO: 123-31-9) is mainly used in photosensitive materials, rubber, dyes, pharmaceutical industry. Black and white contrast to film in the photosensitive material, and it is often used mixed with the developer phenidone metol, it is also used for thermal imprints of poly agent; using hydroquinone as antioxidants raw materials can be used in rubber industry and food industry; hydroquinone is the production of MBH (hydroquinone benzyl ether), DBH (two benzyl hydroquinone ether) antioxidant materials are intermediates in the production of anthraquinone dyes, azo dyes in the dye industry; in medicine, 1 ~ 2% hydroquinone solvent topical treatment of meningitis, Neisseria gonorrhoeae, etc.; in addition, hydroquinone can also be used for styrene, isoprene, butadiene, acrylonitrile, vinyl acetate polymerization such as storage and transportation of the monomers of polymerization agent.

4. Traditional industrial production method of hydroquinone:

(1) O-chlorophenol or adjacent two chlorobenzene hydrolysis method;

(2) The guaiacol(o-methoxyphenol) hydrolysis method;

(3) Aniline oxidation;

(4) Two cumene oxidation method.

The above reaction process complex, more by-products, serious environmental pollution, high production costs, has been gradually phased out in foreign countries. At present in the world almost all of the above 1/3 catechol and hydroquinone was produced by the phenol hydroxyl hydrogen peroxide method. Phenol hydroxyl hydrogen peroxide method is using phenol and hydrogen peroxide as raw materials, production of catechol, generation of 2-benzene in the presence of catalyst, a small amount of tar by-products.

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