Dimethyl Sulfide

Dimethyl sulfide appears as a colorless, transparent liquid; at room temperature, it has a strong odor resembling rotten cabbage, fishy seafood, or corn silk. It is slightly soluble in water and readily soluble in ethanol, diethyl ether, and hydrocarbon solvents.

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Basic properties

Appearance: Dimethyl sulfide is a colorless, transparent liquid.; at room temperature, it has a strong odor resembling rotten cabbage, fishy seafood, or corn silk (detectable at extremely low concentrations; odor threshold approx. 1–10 ppb).
Boiling point: Approx. 37.3°C (highly volatile).
Density: 0.846 g/cm³ (at 20°C; lighter than water).
Solubility: Slightly soluble in water (approx. 2 g/100 mL); readily soluble in ethanol, diethyl ether, and hydrocarbon solvents.
Flash point: Approx. -36°C (highly flammable; classified as a Class I flammable liquid).
Stability: Stable in the presence of alkalis; can be oxidized to sulfoxides or sulfones by strong oxidizing agents.

Primary source

Natural sources: Produced by the decomposition of sulfur-containing amino acids (such as methionine) by marine phytoplankton (especially diatoms); it is a key component of the "ocean scent" in sea breezes and a flavor compound found in cabbage, onions, seaweed, and beer (particularly lagers).
Industrial sources: Produced via the reaction of methanol with hydrogen sulfide over catalysts (such as γ-Al₂O₃ or zeolites) or the reaction of dimethyl sulfate with sodium sulfide; it is also released during the pulping process of black liquor in papermaking.

Industrial use

Organic solvent: Dimethyl sulfide can be used for extraction and as an intermediate in organic synthesis.
Sulfurizing/methylating agent: Acts as a mild methyl source in the synthesis of pesticides and pharmaceuticals.
Fragrance/flavoring (trace amounts): Used at extremely low concentrations to simulate seafood or vegetable aromas (though excessive amounts produce an unpleasant odor).
Component of natural gas odorants: Sometimes combined with compounds like tert-butyl mercaptan to serve as a leak warning agent for gas pipelines (though tetrahydrothiophene is more commonly used for this purpose).

Safety and Toxicology

Toxicity: Low to moderate acute toxicity; oral LD₅₀ in rats ≈ 5350 mg/kg. High vapor concentrations have an anesthetic effect and irritate the eyes and respiratory tract.
Flammability/Explosion: Vapors form explosive mixtures with air; explosive limits are approximately 2.2%–19.7% (v/v).
Olfactory Fatigue: Prolonged exposure causes olfactory desensitization; the absence of odor cannot be used to determine safety.
Protection: Use explosion-proof ventilation and anti-static measures; wear a respirator for organic vapors (with activated carbon filter cartridges); avoid direct skin contact with the liquid (may cause mild irritation).

FAQ

Q: Toxicity and Occupational Health

A: Low acute toxicity: Oral LD₅₀ in rats is approximately 3300–535 mg/kg (data varies by source), placing it in the low-toxicity category;

Primary hazards are irritation and CNS depression: High-concentration inhalation causes irritation to the eyes, nose, and throat, as well as headache, nausea, and drowsiness; high concentrations in confined spaces can lead to hypoxia, coma, or even death;

Olfactory fatigue trap: Sense of smell fails rapidly at high concentrations; the inability to detect the odor does not imply safety-instrumental monitoring is essential;

Not classified as a carcinogen by IARC or NTP; no clear evidence of teratogenicity or mutagenicity;

Occupational exposure limits:

ACGIH TLV-TWA: 10 ppm (25 mg/m³)

ERPG-1 (odor detectable): 0.5 ppm; ERPG-2 (CNS impairment): 1000 ppm; ERPG-3 (lethal risk): 5000 ppm

GHS labeling: H225 (Highly flammable), H319 (Eye irritation), H320 (Eye irritation), H402 (Harmful to aquatic life)

Q: Key Points for Handling and Storage

A: Operate in a fully enclosed system with explosion-proof ventilation; nitrogen blanketing is strongly recommended (to prevent oxidation by air into DMSO). PPE: Half-face respirator (for organic vapors), chemical safety goggles, anti-static workwear, and oil-resistant nitrile or neoprene gloves; handling with bare hands is strictly prohibited. Ensure proper grounding and anti-static measures during filling and transfer; control flow rates; do not use non-explosion-proof tools. Storage: Store in a cool, well-ventilated, explosion-proof facility (refrigeration at 2–8°C is preferred); keep away from heat sources, ignition sources, and strong oxidizing agents. Avoid direct contact with water, steam, or acids (reaction produces toxic, flammable gases).

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