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624-92-0

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Identification

Name
DMDS
CAS
624-92-0
Synonyms
2,3-DITHIABUTANE
DIMETHYL DISULFIDE
DIMETHYL DISULPHIDE
DMDS
FEMA 3536
METHYL DISULFIDE
METHYL DISULPHIDE
(CH3S)2
(Methyldisulfanyl)methane
(Methyldithio)methane
2,3-dithiobutane
ai3-25305
dimethyldisulfane
Disulfide,dimethyl
disulfide,dimethyl-
disulfurededimethyle
disulfuredemethyle
mds
methyldithiomethane
Sulfa-hitech
EINECS(EC#)
210-871-0
Molecular Formula
C2H6S2
MDL Number
MFCD00008561
Molecular Weight
94.2
MOL File
624-92-0.mol

Chemical Properties

Appearance
colourless to yellow liquid with a very unpleasant smell
mp 
-85 °C
bp 
109 °C(lit.)

density 
1.0625
vapor density 
3.24 (vs air)

vapor pressure 
22 mm Hg ( 20 °C)

refractive index 
n20/D 1.525(lit.)

FEMA 
3536
Fp 
76 °F

storage temp. 
Flammables area
Stability:
Stable. Incompatible with strong bases, strong oxidizing agents, strong reducing agents. Flammable.
Water Solubility 
<0.1 g/100 mL at 20 ºC
BRN 
1730824
CAS DataBase Reference
624-92-0(CAS DataBase Reference)
NIST Chemistry Reference
Disulfide, dimethyl(624-92-0)
EPA Substance Registry System
624-92-0(EPA Substance)

Safety Data

Hazard Codes 
F,Xn,N,T+
Risk Statements 
R11:Highly Flammable.
R20/22:Harmful by inhalation and if swallowed .
R36:Irritating to the eyes.
R51/53:Toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment .
R36/37/38:Irritating to eyes, respiratory system and skin .
R26:Very Toxic by inhalation.
R22:Harmful if swallowed.
Safety Statements 
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S61:Avoid release to the environment. Refer to special instructions safety data sheet .
S45:In case of accident or if you feel unwell, seek medical advice immediately (show label where possible) .
S38:In case of insufficient ventilation, wear suitable respiratory equipment .
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection .
S16:Keep away from sources of ignition-No smoking .
S60:This material and/or its container must be disposed of as hazardous waste .
RIDADR 
UN 2381 3/PG 2

WGK Germany 
2

RTECS 
JO1927500

HazardClass 
3
PackingGroup 
II
HS Code 
29309070
Safety Profile
Poison by inhalation. A very dangerous fire hazard when exposed to heat, flame, or oxidzers. Can react vigorously with oxiduing materials. See also SULFIDES.
Hazardous Substances Data
624-92-0(Hazardous Substances Data)

Raw materials And Preparation Products

Hazard Information

General Description
A colorless oily liquid with a garlic-like odor. Denser than water and slightly soluble in water. Flash point 40°F. Vapors heavier than air. May irritate skin and eyes. Used to make other chemicals.
Reactivity Profile
DIMETHYL DISULFIDE(624-92-0) is a reducing agent. A dangerous fire hazard when exposed to oxidizing materials. Emits toxic fumes of oxides of sulfur when heated to decomposition or on contact with acids [Sax, 9th ed., 1996, p. 1320].
Air & Water Reactions
Highly flammable. Slightly soluble in water.
Health Hazard
May cause toxic effects if inhaled or absorbed through skin. Inhalation or contact with material may irritate or burn skin and eyes. Fire will produce irritating, corrosive and/or toxic gases. Vapors may cause dizziness or suffocation. Runoff from fire control or dilution water may cause pollution.
Fire Hazard
HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames. Vapors may form explosive mixtures with air. Vapors may travel to source of ignition and flash back. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapor explosion hazard indoors, outdoors or in sewers. Runoff to sewer may create fire or explosion hazard. Containers may explode when heated. Many liquids are lighter than water.

Material Safety Data Sheet(MSDS)

msds information
DMDS(624-92-0).msds

Questions And Answer

Chemical Properties
Light yellow transparent liquid, malodorous, insoluble in water, Soluble in ethanol, ethyl ether and acetic acid.
Usage
In China:
  • Methyl disulfide is used as a solvent and pesticide intermediates, fuel and lubricating oil additives and Coking inhibitor for ethylene cracking furnace and oil refining equipment etc. It is the principal raw material for methylsufonyl chloride and methanesulfonic acid products. It is used in the synthesis of 4-Methylthio-M-Cresol which is the intermediate of Fenthion and fenamithion. It is  also  used in the synthesis of  p-Methyl Thiophenol which is the intermediate of sulprofos. It is also used as a purifying agent for solvents and  catalysts. It is allowed to be used as a Food Flavoring by GB 2760—1996. Dimethyl disulfide reacted with methylphenol to prouduce 2-methyl-4-hydroxy thioanisole , which condensed  with O, O-Dimethyl sulfide phosphorus oxychloride to produce Fenthion. Fenthion is a highly efficient organophosphorus pesticide with low toxicity and it has a good control effect on rice borers, soybean budworm and gadfly larvae. It Also can be used as a veterinary medicine to exterminate Gadfly maggots and cattle ticks.
International uses:
  • DMDS is used as a food additive in onion, garlic, cheese, meats, soups, savory flavors, and fruit flavors.
  • In agricural application, prior to planting, DMDS can be either injected beneath the soil surface with specialized
  • application equipment or applied to the soil surface through a drip irrigation line. Regardless of
  • the application method, the treated area must be covered with a plastic tarp to retain the
  • fumigant in the soil to improve efficacy and mitigate odor concerns.
  • DMDS can also be used for oil refining and petrochemical industries.
  • Petrochemical plants use DMDS dimethyl disulfide) for hydrocracking catalysts sulfiding in refineries.
  • DMDS (dimethyl disulfide) is the most common compound used for hydrocracking catalysts sulfiding in refineries.
  • DMDS (dimethyl disulfide) in petrochemical is injected continously at low rate in ethylene crackers. It prevents coke formation and mitigates CO formation.
  • DMDS is used in the preparation of 4-(methylthio)phenol which is used in the production of various pesticides. DMDS and chlorine are reacted with borontriflouride phenolate to produce 4-(methylthio)phenol. Thiophene and DMDS are blended with combustible hydrocarbon fuel gas to impart a gassy odor to the fuel gas. DMDS is used as a sulfiding reagent to control catalyst activity.

Production method
Dimethyl disulfide can be prepared by the reaction between imethyl sulfate and sodium sulfide. under stirring, sulfur powder  was added into sodium sulfide solution. The above reaction system was heated  Up to 80-90℃, after reaction for 1 h, cooled to about 30 ℃. Dimethyl sulfate was dropped into the reaction system and the reaction was continued for 2h. Then, distillation, stratification, Separating waste alkali liquor, then through distillation and final products are prepared.
In industry,dimethyl sulfate method is adopted to synthesize dimethyl disulfide. Na2S+S→Na2S2Na2S2+(CH3)2SO4→CH3SSCH3+Na2SO4
Solid sodium sulfide and water are dropped into the reaction kettle , heated , temperature is controlled in the range of  the of 50 ~60 ℃, dissolving sodium sulfide, adding equimolar sulfur, remaining the temperature for 1h, cooling to 45℃, dripping dimethyl sulfate into the reaction kettle, remaining the temperature for 1h, then through distillation dimethyl sulfate can be prepared.
It also can be prepared by the reaction between Magnesium methyl iodide and disulfur dichloride.
It can be prepared by the reaction between sodium disulfide and Methyl sodium sulfate.
It can be prepared by heating Methyl sodium thiosulfate which is the reaction product of methyl bromide and sodium thiosulfate.
Quantity restrictions
FEMA(mg/kg):
bakery product 16.9;Frozen dairy products 4.8;Meat products 2.2;soft sweets 9.4;Jelly and pudding 8.3;
Toxicity
GRAS(FEMA)
Flammability hazard characteristics
Flammable in case of fire, high temperature and oxidant, decomposing out toxic sulfur oxide gas in case of acid or high heat.
storage
Store in a cool, well-ventilated warehouse, separated with oxidant, acid.
Fire extinguishing agent
Dry powder, dry sand, carbon dioxide fire extinguishing agent, foam, 1211 fire extinguishing agent.

Spectrum Detail

Spectrum Detail
DMDS(624-92-0) IR1

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