Benzotriazole is completely soluble in water. Its form in the solution changes according to the pH value: in a strongly acidic solution (pH < 1), it exists in the protonated form of BTAHChemicalbook+2; in a weakly acidic, neutral, and weakly alkaline solution, it exists in the form of BTA; in a strongly alkaline solution (pH > 8), it exists in the form of BTA-

Uses: Benzotriazole is used in anti-rust oil (grease) products, mostly used in copper and copper alloy vapor phase corrosion inhibitors, circulating water treatment agents, automotive antifreeze, photographic anti-fog chemicalbook agents, polymer stabilizers, plant growth regulators, lubricant additives, ultraviolet absorbers, etc. This product can also be used in conjunction with a variety of scale inhibitors, bactericides and algaecides.

Production method:

Benzotriazole can be obtained by the reaction of o-phenylenediamine and sodium nitrite. Dissolve o-phenylenediamine in 50℃ water, add glacial acetic acid, cool to 5℃, add sodium nitrite and stir to react. The reactant gradually turns dark green, the temperature rises to 70-80℃, the solution turns orange-red, and is placed at room temperature for 2h, cooled, filtered out crystals, washed with ice water, and dried to obtain a crude product. The crude product is vacuum distilled, and the fraction of 201-204℃ (2.0kPa) is collected, and then recrystallized with benzene to obtain a product with a melting point of 96-97℃, with a yield of about 80%. It has been reported that the by-product benzotriazole is obtained by treating the condensation wastewater of carbendazim with sodium nitrite.

Melting point 97-99°C (lit.)

Boiling point 204°C (15mmHg)

Density 1,36g/cm3

Bulk density 500kg/m3

Vapor density 4.1 (vsaiChemicalbookr)

Vapor pressure 0.04mmHg (20°C)

Refractive index 1.5589 (estimate)

Flash point 170°C

Storage conditions Storebelow+30°C.

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