Overview
Dichloromethane (DCM), also known as methylene chloride, is a versatile chlorinated solvent with widespread industrial use. First synthesized in 1839, it gained prominence due to its unique balance of high solvency and relatively low toxicity compared to other chloromethanes. Its ability to dissolve a wide range of organic compounds makes it indispensable in sectors like pharmaceuticals, where it serves as a reaction medium and extraction solvent. As a volatile organic compound (VOC), DCM is subject to environmental regulations but remains favored for applications requiring fast evaporation rates. Its non-flammability (flash point: none) distinguishes it from alternatives like acetone or methanol, though health risks necessitate strict handling protocols.
Physical and Chemical Properties
DCM exhibits a density of 1.33 g/cm³, heavier than water, and a narrow liquid range (-96.7°C to 39.6°C). Its low boiling point enables easy distillation for recovery in industrial processes. The compound's dipole moment (1.60 D) and moderate dielectric constant (9.1) contribute to its effectiveness as a solvent for polar and non-polar substances alike. Notably, DCM forms azeotropes with water (boiling point: 38.1°C, 98.5% DCM) and alcohols, which can complicate purification. It undergoes photochlorination under UV light to form chloroform and carbon tetrachloride, requiring stabilization with additives like amylenes for long-term storage.
Main Applications
In paint and varnish stripping, DCM's rapid penetration and resin-dissolving capabilities enable efficient coating removal, though regulations increasingly restrict this use. The pharmaceutical industry employs it in antibiotic production (e.g., penicillin) and caffeine decaffeination due to its selective solubility. DCM acts as a blowing agent in polyurethane foam manufacturing, where its vaporization creates cellular structures. Electronics manufacturers use it for circuit board cleaning, while laboratories apply it in chromatography and extraction processes. Emerging applications include battery electrolyte formulations and metal degreasing.
Safety and Storage
Classified as a Category 2 carcinogen under EU CLP regulations, DCM requires engineering controls (e.g., closed systems, local exhaust ventilation) to limit occupational exposure below 50 ppm (OSHA PEL). Skin contact may cause chemical burns, while inhalation can lead to central nervous system depression. Storage drums should be corrosion-resistant (stainless steel or polyethylene-lined) and kept away from alkaline metals, which may react violently. Firefighters must use self-contained breathing apparatus, as DCM decomposes to phosgene at high temperatures. Spill containment requires non-sparking tools and chemical-resistant PPE.
B2B Procurement Guide
Industrial buyers should prioritize suppliers offering ≥99.5% purity grades with stabilizers for consistent performance. Technical-grade DCM (95–99%) suffices for less sensitive applications. Packaging options range from 250 kg drums to ISO tank containers for bulk shipments. Due to REACH restrictions, verify SDS documentation for compliance with end-use regulations. Some regions require import licenses for quantities exceeding 1,000 kg. Consider tolling arrangements with chemical distributors to mitigate transportation risks. Spot prices fluctuate with chlorine production costs—long-term contracts often provide 5–10% cost stability.
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