Dimethyl sulfide

  • Methylthiomethan
  • 2- Thiopropan
  • Methyl sulfide
  • Sulfur methyl
  • Dimethylthioether

Colorless liquid with an unpleasant odor

Liquid

0.85 g · cm -3 ( 20 ° C)

-98 ° C

37 ° C.

527 hPa ( 20 ° C)

  • Poorly in water (2 g · l-1 at 20 ° C)
  • Soluble in diethyl ether and ethanol

1.4438 (20 ° C)

Risk

Not yet classified

3300 mg · kg -1 ( LD50, rat, oral)

-65.3 KJ / mol

Template: Infobox chemical / molecular formula search available

Dimethyl sulfide (DMS), also Methylthiomethan is a sulfur-containing organic chemical compound with the chemical formula (CH3) 2S. It is the simplest thioether and created among others the cooking various vegetables, especially corn and cabbage, as well as seafood. It also serves as an indicator of a bacterial infection in the production of malt. DMS is a decomposition product of Dimethylsulfoniumpropionats ( DMSP ), but may also arise in the bacterial metabolism of methanethiol.

Occurrence

DMS is the most common biogenic emitted into the atmosphere sulfur compound. It is formed by phytoplankton and dissolved in some nmol / l in the surface water of the oceans, of which about 30 million tonnes of outgas to the atmosphere. There DMS oxidized on dimethylsulfoxide (DMSO) and sulfur dioxide to form sulfuric acid which condenses into droplets. Over the oceans, which is the dominant source of condensation nuclei for cloud formation and thus significantly influenced the Earth's climate, see CLAW hypothesis. DMS is also responsible for the typical odor of the sea. Recent research showed that certain marine bacteria reduce the radiation emitted from the oceans amount of this climate- cooling gas.

DMS also occurs in vaginal secretions of female hamster, which male hamsters follow traces of DMS. DMS is also a cause of halitosis in human breath, it is produced by anaerobic bacteria in the mouth and tongue area or is excreted as a degradation product of drugs via the lungs.

Use

In industry, DMS is used in the refining of petroleum and petrochemical production processes to control the formation of coke and carbon monoxide. In addition, it is used to control dust in steel rolling mills and a variety of organic syntheses. Another field of application can be found in the food industry as a flavoring component. It can be natural or artificially oxidized to sulfoxide, which has several important properties as a solvent.

Safety

Dimethyl sulfide is a flammable chemical ( Flash point: -45 ° C closed cup; ignition temperature: 205 ° C) and classified as harmful. It is very volatile, the vapors are heavier than air and may form explosive mixture with it. The lower explosive limit is 2.2, the upper 19.7 percent by volume DMS.

The LD50 for oral administration, for mice 3,700 mg / kg, the values ​​for rats range 535-3300 mg / kg.

CAS registry number PubChem Vapor pressure Dangerous Substances Directive (67/548/EEC) Brewing Dimethyl sulfoxide Cloud condensation nuclei Flammability limit CRC Handbook of Chemistry and Physics Digital Object Identifier Integrated Authority File
240447
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