Dimethyl Sulfide

Basic Information of Dimethyl Sulfide

CAS No.:	75-18-3
EC No.:	200-846-2
Linear Formula:	C₂H₆S
Molecular Weight:	62.13
Appearance:	Transparent Liquid
Odor:	Strong, characteristic odor.
Melting Point:	−98 °C(lit.)
Boiling Point:	38 °C(lit.)
Density:	0.846 g/mL at 25 °C(lit.)
Solubility:	Slightly soluble in water. Miscible with many organic solvents such as alcohols, ethers, and hydrocarbons.
Odor Threshold:	Extremely low, highly detectable.
Flammability:	Highly flammable liquid and vapor.
RIDADR:	UN 1164 3/PG 2
Chemical Structure:

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Primary Applications of Dimethyl Sulfide (DMS)

Dimethyl Sulfide's unique properties, including its distinctive odor and chemical reactivity, make it a valuable compound with applications across several industries:

1. Food Flavoring Agent:

   Despite its potent smell, DMS is used in very low concentrations as a food additive and flavoring agent. It contributes to the savory, umami, and characteristic "cooked vegetable" notes in various food products, including soups, sauces, meat flavors, and certain dairy products. It's often found naturally in fermented foods, coffee, and cooked vegetables.

2. Odorant:

   Like Tetrahydrothiophene, DMS can be used as an odorant for odorless gases, though it's less common than THT for natural gas due to its volatility. It can be used in other specialized applications where a strong warning odor is required.

3. Chemical Intermediate & Reagent:

   DMS serves as a versatile chemical intermediate and reagent in various organic synthesis reactions. It is a precursor for the production of other organosulfur compounds, sulfonium salts, and as a methylating agent in specific syntheses.

4. Petrochemical Industry:

   In the petrochemical industry, DMS can be used as a pre-sulfiding agent for catalysts, particularly in hydrotreating processes, to activate catalysts before operation.

5. Specialty Solvent:

   It can function as a specialized solvent in certain industrial processes or laboratory applications where its specific solvency properties are advantageous.

6. Pulp and Paper Industry:

   DMS can be a byproduct of the Kraft pulping process, contributing to its characteristic odor. In some cases, it can be captured and utilized.

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Hazards Classification

• GHS Classification: Flammable Liquid (GHS02), Acute Toxicity (GHS06), Skin Corrosion/Irritation (GHS07)

• Hazard Statements: Highly flammable liquid and vapor; harmful if inhaled; causes skin irritation and serious eye irritation.

• UN Number: UN 1164

• Hazard Class: 3 (Flammable Liquids)

• Packing Group: II