Pyrogallol - Supplier Direct

Pyrogallol, or pyrogallic acid (1,2,3-trihydroxybenzene),is an organic compound belonging to the phenol family. It was first obtained in 1786 from Gallic acid, which was derived from galls and barks of various trees. It is converted to Pyrogallol by heating with water under pressure. It is best known for its use as a photographic film developer but is also used as an intermediate in the preparation of a range of other chemicals

History of Pyrogallol

Pyrogallol is the oldest photographic developing agent, and is used in the preparation of other chemicals as well as determining the oxygen content of gas mixtures.  Its peak of popularity as a developing agent was in the 19th and early 20th centuries, but it fell out of favor around the 1920s, because of its reputation for erratic and unreliable behavior and because of its propensity for oxidation.

It is still used by select photographers of Black and White and one can find it in hair dying, dying of suturing materials and for oxygen absorption in gas analysis. It also has antiseptic properties.  It is also widely used in pesticides and as a key intermediate in some pharmaceutical products.

Chemical properties

Pyrogallol is a strong reducing agent , it complexes metal ions (eg Fe 3+ under blue staining) and absorbs oxygen from the air eagerly in alkaline solution . When prolonged in the air (especially in an alkaline solution), pyrogallol is converted by oxidation into carbon dioxide , acetic acid , purpurogalline (trihydroxybenzetropolone) and other decomposition products; The solution turns dark brown. Because of this decomposition, the aqueous solutions gradually become more acid, hence the term pyrogallic acid , which is not a proper name for the pure substance.

​Technical Data

  • Formula: C6H6O3

  • Molecular weight: 126.1100

  • IUPAC Standard InChI:  InChI=1S/C6H6O3/c7-4-2-1-3-5(8)6(4)9/h1-3,7-9H

  • CAS Registry Number: 87-66-1

  • Other names: 1,2,3-Benzenetriol; 1,2,3-Trihydroxybenzene; C.I. Oxidation Base 32; C.I. 76515; Fouramine Brown AP; Fourrine PG; Fourrine 85; Pyrogallic acid; Benzene, 1,2,3-trihydroxy-; 1,2,3-Trihydroxybenzen; 2,3-Dihydroxyphenol; Fouramine base ap; Piral; Pyro; Benzene-1,2,3-triol; NSC 5035; C.I. 76551; Phenol

  • Molar mass     126.11 g · mol -1

  • Physical state  fixed

  • density 1.45 g cm -3  [1]

  • melting point  131-135 ° C  [1]

  • boiling point    309 ° C  [1]

  • vapor pressure   2-4 hPa (140 ° C)  [1]

  • Solubility  Easily soluble in water: 400 g · l -1 (20 ° C)  [1] , ether and alcohol, poorly soluble in Chloroform and Benzene

Manufacturing

Pyrogallol is madeby heating the Gallic Acid. A reactor is used to perform decaboxylization then undergo sublimation, after which point the finished Pyrogallol can be collected.

Safety

Pyrogallol is harmful to health. It is also gradually absorbed through the skin. The potential mutagenic effect of pyrogallol is emphasized in various internet articles. 

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Pyrogallol Uses

It has been used for quantitative (quantitative) oxygen analysis and earlier also as a photographic developer and is still used in holography today.

 

Electronic chemical

This is primarily in Asia and related to photo resistant capabilities and applications in LED and LCD technology. 

 

Agrochemical

This is for the production of pesticides and other applications.

 

Pharmaceutical

-           Traditional Chinese medicine (TCM)Medical materials

-           Used as an intermediate for API manufacturing

 

Other Applications

-           Surface coating-anti-corrosion

-           Photography

-           Rubber coagulation

-           Mineral separation - Mining

-           Analysis – Oxygen content

-           Dyes for textiles and hair

-           Cosmetic industry

Contacts

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