Tolyltriazole, Tolytriazole


Pure tolyl-triazole is a white granule or powder. Tolyltriazole corrosion inhibitor is a mixture of 4-methyl-benzotriazole and 5-methyl-benzotriazole. The melting point is from 80℃ to 86℃. It is soluble in alcohol, benzene, toluene, chloroform, and watery lye. Tolytriazole is hardly soluble in water.

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Molecular Formula:


Molecular Weight:



AppearanceWhite granular
Purity, %99.0 Min.
Moisture, %0.2 Max.
Melting point, ℃80~86
Ash content, %0.05 Max.
pH value5.5~6.5


1. An older method is obtained by reacting m-toluidine diazonium salt with p-toluene sulfonamide.

2. Toluidine is diazotized, cyclized in acetic acid, and then distilled under reduced pressure to obtain crude tolytriazole. After recrystallization, refinement, and drying, a purer tolyl triazole can be produced.

3. There is another method to produce purer tolytriazole without distillation: methyl o-phenylenediamine and Ethylhexyl nitrite as raw materials and ethyl hexanol as solvent.


1. Feeding: Put o-phenylenediamine, sodium nitrite, and water into the stainless steel reaction kettle in the ratio of 1:1.1~1.2:10~15.

2. Raise temperature and pressure: turn on the stirring, raise the temperature to 240~260℃, control the pressure between 3.0~4.0MPa, and keep the reaction warm for 3~3.5 hours.

3. Transfer to acidification kettle: lower the temperature to 120~130℃, and transfer the reaction product to the kettle.

4. Adjust pH and stratification: Adjust pH from 11.7 to 5.0 with concentrated sulfuric acid and stratify.

5. Purification and collection: The stratified oil layer goes into the distillation kettle for purification under reduced pressure, and the 202~204℃/15mmHg fraction products are collected.


Tolyltriazole is mainly used as an antirust and corrosion inhibitor for metals. Such as silver, copper, zinc, lead, nickel, etc. It is also for antirust oil (tallow) products, the gas phase corrosion inhibitor of copper and aldary, lubricant additive, cycle water treating compounds, and auto antifreeze.

Tolyltriazole also can be concernedly used with manifold sterilization algaecide. It has a very fine corrosion mitigation effect on close-cycle cooling water systems.

Compared with benzotriazole, tolyltriazole has better corrosion inhibition, thermal stability, and chlorine resistance. Tolyltriazole can replace benzotriazole in the automotive industry and water treatment industries.

Tolyltriazole has one more methyl group than benzotriazole in the molecular structure, which improves the complex film’s hydrophobicity. And the presence of methyl group does not interfere with the binding between molecule and copper.

Packing and Storage:

25 kg/bag or customers’ requirement. Easy to wet, please put in aeration, dry place. Do not mix it with food and seed.

25kg paper bags


Methyl 1H-Benzotriazol, methyl benzotriazole, Tolutriazole.


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