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1H-Benzotriazole CAS 95-14-7

Molecular Formula: C6H5N3

Formula Weight: 119.12

ZSpharmac: 1H-Benzotriazole Supplement

Product Name: 1H-Benzotriazole
CAS No: 95-14-7
Purity: 99%

Basic Info

Product Name:1H-Benzotriazole
Other Names:Benzisotriazole
Place of Origin:Shandong, China
Brand Name:ZSpharmac
Type:Organic Intermediate
Appearance:White to Yellow-Beige Powder, Granules, Crystals, Needles or Flakes
EINECS No.:202-394-1
Storage:Store Below +30°C.
Provide:1H-Benzotriazole MSDS;
1H-Benzotriazole COA

What is 1H-Benzotriazole?

1H-Benzotriazole is also known as 1,2,3-benzotriazole. Aliases: benzotriazepines, indene triazepines.
Appearance is white or yellowish needle-like crystal, which gradually oxidizes and turns red when exposed to air, soluble in alcohol, benzene, toluene and chloroform; slightly soluble in water. Benzotriazoles are a valuable compound. It is widely used in various aspects of chemistry. Such as preservatives, anticoagulants, lubricants, preparation dye intermediates, plant growth regulators, photographic antifogging agents, etc. as synthetic detergents.
The preparation method of benzotriazole usually uses o-phenylenediamine diazotization to prepare o-aminobenzene diazonium salt, and then immediately cyclizes one-step synthesis to obtain 1H-Benzotriazole crude product, which is then recrystallized and filtered to dryness to obtain benzene. And pure triazole.

The prior art J. Am. chem. socl 952. 74. 3868; J. Am. chem. socl 954. 76. 1847, Fieser 16. 21; Described preparation process, product quality index only mentions 96~97 ℃ of fusing points, does not introduce the concrete technological parameter of reaction, all need to be solved about the problem of these aspects.

1H-Benzotriazole Properties:

Melting point 97-99 °C(lit.)
Boiling point 204 °C (15 mmHg)
density 1,36 g/cm3
vapor density 4.1 (vs air)
vapor pressure 0.04 mm Hg ( 20 °C)
refractive index 1.5589 (estimate)
Fp 170 °C
storage temp. Store below +30°C.
solubility 19g/l
form Powder, Granules, Crystals, Needles or Flakes
pka1.6(at 20℃)
color White to yellow-beige
OdorSlight characteristic odor
PH6.0-7.0 (100g/l, H2O, 20℃)suspension
explosive limit2%
Water Solubility 25 g/l in water (20 ºC)


1H-Benzotriazole Uses

  1. 1H-Benzotriazole is generally used as water therapy representative, steel corrosion inhibitor and deterioration prevention. Benzotriazole is just one of one of the most efficient deterioration preventions for copper and copper alloys in cooling water supply.
  2. 1H-Benzotriazole is made use of in severe stress industrial equipment oil, hyperbolic gear oil, anti-wear hydraulic oil, oil movie bearing oil, lubricating oil, etc. It can be used as anti-rust and also gas stage corrosion inhibitor.
  3. 1H-Benzotriazole is utilized in anti-rust oil (grease) products, mainly utilized as gas stage rust prevention for copper and also copper alloys, distributing water treatment representative, automobile antifreeze, photographic antifogging agent, polymer stabilizer, plant growth regulatory authority, Lubricating substance ingredients, UV absorbers, and so on. This product can likewise be used combined with a selection of scale inhibitors, bactericidal and also algicides.
  4. 1H-Benzotriazole is commonly used for corrosion restraint as well as rust avoidance of copper and silver devices. It can likewise be made use of in the preparation of photo anti-ash, anti-fogging representative as well as gas-phase corrosion prevention.
  5. 1H-Benzotriazole is utilized to cleanse silver, copper and also zinc externally in electroplating, and also has the result of avoiding staining. Benzotriazole (BTA) creates covalent bonds and also sychronisation bonds with copper atoms, and changes each other to develop a chain polymer, developing a multi-layer safety film on the copper plus surface area, to ensure that the surface of copper does not undergo redox response, as well as does not react.It can also be made use of in conjunction with a range of range preventions, bactericidal and algicides, especially for closed circulating cooling water systems. effect. BTA is a great UV absorber, and it can maintain UV-sensitive products, such as avoiding the fading of diazo dyes, and dealing with paper, woven textiles, movies, metal coins and various other sheet items with BTA can avoid discoloration. In the machining process, adding BTA to grinding oil as well as cutting oil can keep the refined copper parts from staining. The item can likewise be made use of as an analytical reagent, integrated with ammonia and also diaminetetraacetic acid, can be made use of to precisely identify silver, copper, zinc. It can additionally be made use of as a photographic anti-fogging representative and also an intermediate in natural synthesis.
  6. 1H-Benzotriazole is utilized as an analytical reagent and also a photographic antifogging representative, as well as is likewise used in natural synthesis.
  7. 1H-Benzotriazole lubricant additive; steel deactivator; severe pressure agent, microorganisms as well as oxidation prevention, utilized as antioxidant in inner burning engine oils.


The inventors of the present invention have put forward a complete technical solution through a large number of tests in combination with the source of the raw materials and the reaction mechanism.
The technical scheme of the present invention is that after single diazotization reaction is carried out with o-phenylenediamine, glacial acetic acid and sodium nitrite, the cyclization is performed immediately, the crude benzotriazole is cooled and separated out, and then the benzotriazole is recrystallized with water to obtain the benzotriazole. Finished product, the melting point is 96~100 ℃ (2 ℃), namely the melting point range is between 96~100 ℃, and the melting range interval is within 2 ℃.
Reaction formula of the present invention is as follows:

A kind of synthetic method of 1H-Benzotriazole, it is characterized in that this synthetic method comprises the steps: (1) after o-phenylenediamine, glacial acetic acid, sodium nitrite carry out single diazotization reaction, immediately cyclize; The mol ratio of o-phenylenediamine, glacial acetic acid, sodium nitrite is 1.0: 2.0: 1.09, and temperature of reaction is 90~95 ℃, and the reaction times is 45~60 minutes, and then the reaction solution is naturally cooled to 40 During ~45 DEG C, directly add in the reaction solution with crushed ice and sharply cool, separate out the benzotriazole crude product;
(2) 1H-Benzotriazole crude product is heated to dissolve recrystallization with water and sodium sulfite, and heating temperature is 95~100 ℃, wherein the ratio of the weight of benzotriazole crude product and water is 1: 10~12, benzotriazole The weight ratio of azole crude product and sodium sulfite is 1: 0.007~0.01, filter while hot, the filtrate is cooled to 10~15 ℃, and crystallization is separated out, and crystallization is filtered, dried, and dried to obtain benzotriazole essence product. The appearance is white to slightly yellow needle-like crystals, and the melting point is 96~100°C (2°C). Sodium sulfite is a reducing agent, which plays an antioxidant role and prevents oxidative discoloration of benzotriazole.
The single diazotization reaction temperature described in the step (1) of the present invention is 90~95 ℃, is to directly pass into the reaction solution with water vapor to control.
When the benzotriazole crude product described in step (2) in the present invention is dissolved by heating with water and sodium sulfite, gac is added simultaneously, and the ratio of the weight of gac and benzotriazole crude product is 0.07~0.08: 1.
The crystallization drying temperature described in step (2) in the present invention is 45~50 ℃.
The raw materials o-phenylenediamine, glacial acetic acid and sodium nitrite used in the present invention are all technical grades.
The method of the invention has the advantages of safe and simple operation, high purity, good quality, especially good appearance, and has obvious advantages.

1H-Benzotriazole Specific Embodiment

In a 3000ml beaker equipped with a stirrer and a thermometer, add 108 grams (1 mole) of o-phenylenediamine, 75 grams (1.09 moles) of sodium nitrite, 400ml tap water, and start stirring; and heated in a water bath to 45 About °C, the sodium nitrite is dissolved, then under stirring, gradually add 120 grams (2 moles) of glacial acetic acid, the temperature rises rapidly, and the reaction temperature is maintained at about 92 °C, and the reaction time is 55 minutes. After finishing, continue stirring, let it be cooled to about 45 DEG C, directly add crushed ice cubes in reaction solution, separate out granular mass immediately, and vacuum dry to obtain 140 grams of benzotriazole crude products.

Note: The mother liquor was concentrated to obtain the second crude 1H-Benzotriazole.

A 3000ml four-necked round-bottomed flask equipped with a stirrer, a thermometer, a condenser and a feeding port was placed in a jacket thermostat, and 1400ml of tap water was added to the flask, and 140 grams of crude benzotriazole was added under stirring, 1 2 grams of sodium sulfite, 10 grams of activated carbon, after heating and refluxing at 95~100 DEG C for half an hour, fully dissolved, vacuum filtration, and the filtrate is allowed to cool and has white needle-like crystals to separate out. Extract needle crystal, dry, and drying temperature is 45-50 DEG C, obtains 83 grams of benzotriazole refined products, yield 70%, appearance is white needle crystal, and fusing point is 96~100 DEG C (2 DEG C ).

The mother liquor obtained by vacuum filtration can be recycled and applied until the color of the mother liquor is darker. Generally, it can be recycled three or four times, and then the mother liquor can still be concentrated to obtain the 1H-Benzotriazole crude product, and the 1H-Benzotriazole yield can reach 75~80%.

About Us

The production base is located in Zhangqiu chemical industry park and Tai’an high-tech chemical industry park. laboratory and workshop in strict accordance with the GMP standard and the product fit national ISO9001 and ISO2000 standards.

“Zhishang” products are exported to Europe, North and South America, the Middle East, Asia Pacific and Africa area, so as to establish a long-term and stable cooperation relationship with customer in the world.

Company Info
  • Business Type: Manufacturer
  • Product Range: Additive , Chemical Auxiliary & Catalyst , Organic Chemicals
  • Products/Service: Organic Intermediate,Inorganic Chemistry, APIs, Dyestuffs And Pigments, Fragrance And Spices, Food Additives
  • Total Employees: 51~100
  • Capital (Million US $): 10000000RMB
  • Year Established: 2016
Production Capacity
  • No. of Production Lines : 8
  • No. of QC Staff : 5 -10 People
  • OEM Services Provided : yes
  • Factory Size (Sq.meters) : 3,000-5,000 square meters
  • Certificate: ISO9001 , CE , GMP , API , MSDS
  • Factory Location : Diao Town Industry Park, Zhangqiu City, Jinan City, Shandong Province, China.


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Do you accept sample order?

We will make samples before mass production, and after sample approved, we’ll begin mass production. Doing 100% inspection during production, then do random inspection before packing.



You can get free samples for some products,you only need to pay the shipping cost or arrange a courier to us and take the samples. You can send us your product specifications and requests,we will manufacture the products according to your requests.

What’s your MOQ?

Our MOQ is 1kg. But usually we accept less quantity such as 100g on the condition that sample charge is 100% paid.

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Yes. We’ll give you product analysis report before shipping.

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Different quantity has different discount.


1. ≤50kg, Express delivery recommended, usually called as DDU service;

2. ≤500kg, Air shipping recommended, usually called as FOB, CFR, or CIF service;

3. >500kg, sea shipping recommended, usually called as FOB, CFR, or CIF service;

4. For high value products, please select air shipping and express delivery for safe.

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