Phenol ketone products

Plastic rubber

Current Location： Home > News > Chemical Knowledge > Production and manufacturing method and process of toluidine red

[Chemical Knowledge]：Production and manufacturing method and process of toluidine red

Read： 516 Time：16months ago Source：Transform the World with Simplicity

Toluidine red is a commonly used chemical pigment, which has excellent heat resistance, light resistance and solvent resistance, and is widely used in plastics, paints, inks and other fields. The following is the manufacturing method of toluidine red:

1. raw material preparation

1. Toluene: Toluene is the main raw material for the preparation of toluidine red, which requires high purity, and industrial grade toluene is generally used.
2. o-Nitroaniline: o-Nitroaniline is another important raw material of toluidine red, also need higher purity.
3. Hydrochloric acid: industrial grade hydrochloric acid is generally used to adjust the pH value of the reaction system.
4. Sodium nitrite: For the formation of diazonium salts, higher purity is also required.

2. manufacturing process

1. diazotization
of o-nitroaniline Add o-nitroaniline into hydrochloric acid, stir and cool to 0-5 ℃, slowly add sodium nitrite solution, keep the temperature at 0-5 ℃, and generate diazonium salt.
2. Amination
of Toluene In another reactor, toluene and sodium hydroxide are added, heated to a certain temperature, and a diazonium salt solution is introduced to carry out a coupling reaction to produce toluidine red.
3. Post-treatment
After the reaction is completed, the reaction solution is cooled to room temperature, filtered, washed and dried to obtain a toluidine red product.

3. precautions

1. diazotization reaction is exothermic reaction, the need to strictly control the temperature, to prevent violent boiling and flushing.
2. Diazonium salt is explosive and needs to be operated at low temperature and avoid contact with organic matter and acid.
3. The pH value of the amination reaction needs to be controlled to ensure the smooth progress of the reaction.
4. In the entire manufacturing process, it is necessary to pay attention to environmental protection and safety to avoid harm to the environment and personnel.

The above is the manufacturing method of toluidine red, and the specific operation needs to be adjusted and optimized according to the actual situation. At the same time, in order to ensure product quality and environmental protection requirements, it is necessary to strictly control the quality of raw materials and various parameters in the manufacturing process.

Previous： The production and manufacturing method and process of pearl pulp.

Next： Manufacturing method and process of barite

News Categories