3-Methylaniline (m-toluidine) is a colorless liquid that turns yellow or reddish brown in the air or under the influence of light. Slightly soluble in water, soluble in ethanol and ether. It can evaporate together with water vapor and is produced by the reduction reaction of m-nitrotoluene. 3-Methylaniline is mainly used as a pharmaceutical synthesis intermediate.

Applications

Methylaniline is one of the simplest aromatic amines and a widely used organic synthesis intermediate. It is widely used as an organic synthesis intermediate for dyes, pesticides, medicines, etc. Chemicalbook. At present, domestic production mainly uses nitrotoluene as raw material, ethanol or methanol as solvent, and skeleton Ni as catalyst to perform hydrogenation reaction to prepare methylaniline.

The synthesis method uses nickel as a catalyst to catalyze the hydrogenation reaction of m-nitrotoluene in industrial methanol solvent to generate m-toluidine. Through single factor examination and orthogonal experiments, using 80g m-nitrotoluene as the calculation benchmark and under the fixed conditions of 200mL industrial methanol solvent, the optimal Chemicalbook reaction conditions were: 2.0g catalyst, 6h reaction time, and reaction temperature The temperature is 90℃, and the reaction pressure is 1.6MPa. The m-toluidine content obtained under these conditions is 99.79%, the light component content is 0.11%, and the heavy component content is 0.10%

chemical properties

CAS No. 108-44-1

Molecular formula C7H9N

Molecular weight 107.15

EINECS No. 203-583-1

Melting point -30°C

Boiling point 203-204°C (lit.)

Density 0.999g/mL at 25°C (lit.)

Vapor pressure 0.3hPa (20°C)

Refractive index n20/D1.567 (lit.)

Flash point 186°

Storage conditions Storebelow+30°C.

Solubility 0.2g/100ml (20°C)

Form Crystalline solid or liquid

Acidity coefficient (pKa) 4.73 (at25°C)

Color White Odor (Odor)

Aromatic aniline-like odor

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