Dimethyl Disulfide

Basic Information of Dimethyl Disulfide

CAS No.:	624-92-0
EC No.:	210-871-0
Linear Formula:	C₂H₆S₂
Molecular Weight:	94.2
Appearance:	Clear, colorless to pale yellow liquid
Odor:	Strong, characteristic odor.
Melting Point:	-85 °C
Boiling Point:	109 °C(lit.)
Density:	1.0625
Solubility:	Slightly soluble in water. Miscible with many organic solvents such as alcohols, ethers, and hydrocarbons.
Flash Point:	76 °F
Odor Threshold:	Extremely low, highly detectable.
Flammability:	Flammable liquid and vapor.
RIDADR:	UN 2381 3/PG 2
Chemical Structure:

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Primary Applications of Dimethyl Disulfide (DMDS)

Dimethyl Disulfide's unique properties, including its sulfur content, reactivity, and potent odor, make it a valuable compound with applications across several industries:

1. Sulfiding Agent in Petrochemical Industry:

   This is one of its most important applications. DMDS is widely used as a sulfiding agent to activate catalysts (e.g., hydrodesulfurization, hydrocracking catalysts) in refineries. It provides a safer and more efficient alternative to hydrogen sulfide for controlled sulfiding, improving catalyst performance and extending their lifespan.

2. Chemical Intermediate & Reagent:

   DMDS serves as a versatile chemical intermediate and reagent in various organic synthesis reactions. It is a precursor for the production of other organosulfur compounds, pharmaceuticals, agrochemicals, and specialty chemicals. It can be used to introduce methylthio groups into organic molecules.

3. Fumigant & Pesticide:

   In agriculture, DMDS is used as a fumigant to control soil-borne pests, nematodes, and weeds, particularly in certain fruit and vegetable crops. It acts as a broad-spectrum biocide, often used as an alternative to methyl bromide in some regions.

4. Odorant:

   Due to its strong, distinctive odor, DMDS can be used as an odorant in various applications where a warning signal for leaks or presence of other substances is required. It can also be a component in some natural gas odorant blends.

5. Flavoring Agent:

   In extremely low concentrations, DMDS contributes to the characteristic flavor and aroma of certain foods, such as garlic, onion, and some cheeses, acting as a flavoring agent in the food industry.

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Hazards Classification

• GHS Classification: Flammable Liquid (GHS02), Acute Toxicity (GHS06), Health Hazard (GHS08), Irritant (GHS07), Environmental Hazard (GHS09)

• Hazard Statements: Highly flammable liquid and vapor (H225); Toxic if inhaled (H331); Harmful if swallowed (H302); Causes serious eye irritation (H319); May cause an allergic skin reaction (H317); May cause respiratory irritation (H335); Very toxic to aquatic life with long lasting effects (H410).

• UN Number: UN 2381

• Hazard Class: 3 (Flammable Liquids)

• Packing Group: II