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It belongs to the class of aromatic hydrocarbons, derived from benzene by replacing one hydrogen atom with a methyl group (-CH3). As a hazardous chemical, it is classified as Class 3 Flammable Liquids (UN number 1294) and is also listed as a harmful substance due to its toxicological properties.
Basic Information
| Item | Details |
| Chemical Formula | (C7H8) |
| Peso molecular | 92.14 g/mol |
| Appearance | Colorless transparent liquid; aromatic odor |
| Key Physical Properties | Melting point: -95°C; boiling point: 110.6°C; density: 0.87 g/cm³ (20°C); volatile; slightly soluble in water, miscible with ethanol, ether, acetone and most organic solvents |
| Purity Grades | Industrial grade (≥99.5%), reagent grade (≥99.8%), high-purity grade (≥99.99% for electronic applications) |
| Production Method | Mainly produced from petroleum refining (catalytic reforming of naphtha) and coal tar distillation; also synthesized via toluene disproportionation to produce benzene and xylene |
Core Chemical Properties
Flammability: Highly flammable, with a flash point of 4°C and an explosive limit of 1.2%–7.0% (v/v) in air. It can form explosive mixtures with air, and the vapor can spread to ignition sources and cause backfire.
Aromatic Ring Reactivity: Similar to benzene, the aromatic ring of toluene undergoes substitution reactions (e.g., nitration, sulfonation, halogenation). The methyl group activates the benzene ring, making reactions more likely to occur at the ortho and para positions.
Methyl Group Reactivity: The methyl group can be oxidized to a carboxylic acid group (-COOH) under strong oxidizing conditions, forming benzoic acid.
Toxicity: Inhalation of toluene vapor can cause central nervous system depression (headache, dizziness, nausea). Long-term exposure may damage the liver, kidneys and hematopoietic system. It is not classified as a carcinogen, but its metabolite benzyl alcohol has certain toxic effects.
Main Applications
Chemical Synthesis: A key raw material for the production of benzene, xylene, and other aromatic hydrocarbons; used to synthesize toluene diisocyanate (TDI, for polyurethane foam), benzoic acid, phenol, and cresol.
Solvente: Widely used as an industrial solvent in paints, coatings, adhesives, printing inks, and rubber processing; dissolves many organic compounds that are insoluble in water.
Petrochemical Industry: Serves as a component of gasoline, improving the octane number of gasoline and enhancing combustion efficiency.
Pharmaceuticals & Pesticides: Used in the synthesis of certain drugs, pesticides, and dyes.
Laboratory Applications: A common organic solvent for chemical experiments, sample extraction and purification.