Dimethyl Disulfide (DMDS) CAS 624-92-0

Dimethyl Disulfide (DMDS) – Versatile Organosulfur Compound for Refining, Agriculture, and Synthesis

Basic Information

• CAS Number: 624-92-0

• Molecular Formula: C₂H₆S₂

• Molecular Weight: 94.20 g/mol

• EINECS Number: 210-871-0

• Appearance: Clear colorless to light yellow liquid

• Odor: Strong, pungent sulfur-like odor

• Melting Point: –85°C

• Boiling Point: 109–110°C

• Density: ~1.06 g/mL at 20°C

• Flash Point: 15–24°C (highly flammable)

• Vapor Pressure: 3.8 kPa at 25°C

• Solubility: Slightly miscible with water; miscible with ethanol, ether, and most organic solvents

Overview
Dimethyl disulfide (DMDS) is an organosulfur compound with a characteristic strong odor. It is a volatile, flammable liquid with high chemical stability. Its unique sulfur-containing structure makes it a valuable reagent in petroleum refining, agriculture, organic synthesis, and the flavor industry.

Applications

• Petroleum refining: Used as a sulfiding agent to convert metal oxide catalysts into their active metallic sulfide form for hydrotreating, hydroforming, and hydrocracking processes. Also employed as a passivation agent to reduce coke formation in furnaces and reactors, improving run length and equipment life. With a sulfur content of 68% by weight, DMDS is one of the most efficient sulfiding agents available.

• Agriculture: Acts as a broad‑spectrum soil fumigant effective against nematodes, soil‑borne pathogens, fungi, weeds, and insects. It is considered an environmentally friendly alternative to methyl bromide.

• Organic synthesis: Serves as a reagent and intermediate in the production of sulfur‑containing compounds, including pharmaceuticals, pesticides, and rubber additives.

• Flavor and fragrance: Used as a food additive to impart onion, garlic, cheese, meat, and savory flavors.

• Other uses: Corrosion inhibitor, jet fuel additive (replacing methyl mercaptan), and reagent in analytical chemistry.

Handling and Storage

• DMDS is highly flammable – store away from ignition sources, heat, and oxidizing agents.

• Keep containers tightly sealed in a cool, dry, well‑ventilated area, protected from direct sunlight and moisture.

• Incompatible with strong bases, strong oxidizing agents, and strong reducing agents.

• Use appropriate personal protective equipment (gloves, safety goggles, protective clothing) when handling.

• In case of fire, use dry chemical, CO₂, or foam extinguishers; water may be ineffective.

Packaging
Available in various container sizes (e.g., 25 kg, 100 kg drums, ISO containers, railcars). Custom packaging upon request.

Quality Assurance
Each batch is tested for purity (≥98.5% by GC), color, and physical properties to ensure consistent performance.