Dimethylsulfid

Dimethylsulfid
Strukturformel
Molekylmodel
IUPAC-navn
Dimethyl sulfide (foretrukken: Methylsulfanylmethane)
Generelt
Systematisk navnDimethylsulfid
Andre navneMetyltiometan, DMS
Molekylformel(CH3)2S
Molarmasse62,134
FremtrædenFarveløs væske
CAS-nummer75-18-3
SMILESCSC
Kemiske egenskaber
Opløselighed i vand2
Smeltepunkt-98
Kogepunkt37
Sikkerhed
NFPA 704
Hvis ikke andet er angivet, er data givet for
stoffer i standardtilstanden (ved 25 °C, 100 kPa)

Dimethylsulfid (også dimetylsulfid, methylthiomethane, metyltiometan og DMS) er en organisk svovlforbindelse med formlen (CH3)2S.

Egenskaber

Dimetylsulfid er en brandfarlig væske som stort set er uopløselig i vand. Det har en meget karakteristisk lugt som indgår i de emner som frigøres når majs, kål eller rødbeder varmes op. Dimetylsulfid er også årsagen til den karakteristiske lugt af hav. Det er også et tegn på bakteriel infektion ved fermentering af malt. Det dannes også som et biprodukt i sulfatprocessen.

Anvendelse

Dimetylsulfid anvendes indenfor den petrokemiske industri for at hindre dannelsen af koks og kulmonoxid. Det anvendes også indenfor organisk syntese.

Vejrvirkning

Dimetylsulfid (DMS) er en organisk komponent hvorved meget (15%) svovl formidles fra og til atmosfæren. DMS fotooxideres til sulfat-bioaerosoler, som er med til at danne skyer og tåge. [1] [2] [3]

Kilder/referencer

  1. ^ NOAA: Oceanic Dimethylsulfide (DMS) and Climate Citat: "...Oceanic DMS emissions account for 15% of the total global sulfur emissons of 3.2 Tg S/year..."
  2. ^ Dimethylsulfide Emission: Climate Control by Marine Algae? (Released November 2003) Citat: "...DMS has a significant impact on the Earth's climate. Plankton production of DMS and its escape to the atmosphere is believed to be one of the mechanisms by which the biota can regulate the climate..."
  3. ^ Netherlands Organization For Scientific Research (2004, November 24). Plankton Cool The Southern Hemisphere. ScienceDaily Arkiveret 18. maj 2014 hos Wayback Machine Citat: "...the plankton species in the southern hemisphere produce more DMS than their northern counterparts. Also in the southern hemisphere there is a higher DMS flux from the sea...The effects of the DMS production by plankton are particularly noticeable at a regional level..."

Se også

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