528021

Dimethyl sulfide

• Synonym(s): DMS, Methyl sulfide
• Linear Formula: (CH₃)₂S
• CAS Number: 75-18-3
• Molecular Weight: 62.13
• Beilstein: 1696847
• EC Number: 200-846-2
• MDL number: MFCD00008562
• UNSPSC Code: 12352200
• PubChem Substance ID: 329757889

Properties

• vapor density: 2.1 (vs air)
• vapor pressure: 26.24 psi ( 55 °C); 7.79 psi ( 20 °C)
• Assay: ≥99%
• autoignition temp.: 402 °F
• expl. lim.: 19.7 %
• availability: available only in EU
• refractive index: n20/D 1.435 (lit.)
• bp: 38 °C (lit.)
• mp: −98 °C (lit.)
• solubility: water: soluble 7.28 g/L at 20 °C
• density: 0.846 g/mL at 25 °C (lit.)
• storage temp.: 2-8°C
• SMILES string: CSC
• InChI: 1S/C2H6S/c1-3-2/h1-2H3
• InChI key: QMMFVYPAHWMCMS-UHFFFAOYSA-N

Description

General description

Dimethyl sulfide (DMS) is a biogenic sulfur compound that is released from the ocean to the atmosphere. It forms the main component of the global sulfur cycle. The thermal decomposition behavior of dimethyl sulfide in gas phase has been investigated in a static system at 681-723K. The mechanism of its photochemical oxidation in atmosphere has been described. The rate constants of the gas phase reaction between OH radicals and DMS have been determined by relative rate method and flash photolysis. The differential Raman cross section, σ_DMS at different excitation wavelengths has been measured. The adsorption of DMS on activated carbons (ACs) has been reported to take place by hydrogen bonding.

Application

Dimethyl sulfide may be used to prepare methanethiol by thiolation reaction with hydrogen sulfide (H₂S) in the presence of tungsten-zirconia (WO₃/ZrO₂) catalyst.

Legal Information

Product of Arkema

Safety Information

• Pictograms: GHS02
• Signal Word: Danger
• Hazard Statements: H225
• Precautionary Statements: P210 - P233 - P240 - P241 - P242 - P243
• Hazard Classifications: Flam. Liq. 2
• Storage Class Code: 3 - Flammable liquids
• WGK: WGK 1
• Flash Point(F): -32.8 °F - closed cup
• Flash Point(C): -36 °C - closed cup
• Personal Protective Equipment: dust mask type N95 (US), Eyeshields, Gloves