Dichlormethan

Dichlormethan, also known as methylene chloride, is a colorless, dense, volatile liquid with a sweet, ether-like odor. Its chemical formula is CH2Cl2. It is widely used as an organic solvent and intermediate in chemical manufacturing.

Production and sources: It is produced commercially by chlorination of methane, yielding a mixture of chlorinated methanes that are separated by distillation to isolate dichloromethane.

Properties: Methylene chloride boils at 39.6°C and has a density of about 1.33 g/cm3. It is miscible with many organic solvents but only sparingly soluble in water. It is not considered flammable at ambient conditions, but high heat or flame can cause decomposition to toxic phosgene.

Uses: It is a versatile solvent for paints, coatings, adhesives, degreasing of metal parts, and as a processing solvent in the pharmaceutical and polymer industries. It has also been used as a propellant in aerosols, though consumer uses have declined due to health concerns.

Safety: Inhalation or skin contact can irritate mucous membranes, eyes and skin; exposure can cause dizziness, headache and narcosis. The body metabolizes part of the inhaled dose to carbon monoxide, contributing to hypoxia in some cases. Proper ventilation and personal protective equipment are recommended; use containment to prevent releases and follow applicable exposure guidelines.

Environment and regulation: It is a volatile organic compound that readily evaporates and degrades in the atmosphere; spills may contaminate soil or groundwater if not contained. Many jurisdictions regulate occupational exposure and restrict certain consumer uses to limit health and environmental risks.