Dimethyl disulfide(DMDS)

2015-7-13 5:54:42 Others

Dimethyl disulfide (DMDS) is an organic chemical compound with the molecular formula CH3SSCH3 which is thesimplest disulfide. It is a flammable liquid with an unpleasant, garlic-like odor.

Chemical Name: Dimethyl disulfide

IUPAC name: (Methyldisulfanyl)methane

Other Names: Dimethyl disulphide; Methyl disulfide; Methyldisulfide; Dimethyldisulfide; Methyldithiomethane; 2,3-Dithiabutane

Chemical Formula: C2H6S2

Structural Formula: CH3-S-S-CH3

Molecular Weight: 94.2

CAS No.624-92-0 

Typical Physical and Chemical Properties

Properties

Specification

Assay

99.5%

Appearance

Colourless liquid

Methyl Mercaptan

0.1%

Moisture

0.06%

 

Package

-          200kg net UN iron drum;

-          24-26m3 ISO tank

 

Occurrence

Dimethyl disulfide along with dimethyl sulfide and dimethyl trisulfide have been confirmed as volatile compounds given off by the fly-attracting plant known as dead-horse arum (Helicodiceros muscivorus). These flies are attracted to the odor of fetid meat, they help pollinate this plant.

DMDS can be produced by the oxidation of methanethiol, e.g. with iodine:

2 CH3SH + I2 → CH3SSCH3 + 2 HI

Chemical reactions

Important reactions include chlorination giving methanesulfenyl chloride (CH3SCl), methanesulfinyl chloride (CH3S(O)Cl),andmethanesulfonyl chloride (CH3SO2Cl) as well as oxidation with hydrogen peroxide or peracetic acid giving the thiosulfinate methyl methanethiosulfinate (CH3S(O)SCH3).

Uses

DMDS is used as a food additive in onion, garlic, cheese, meats, soups, savory flavors, and fruit flavors. Industrially, DMDS is used in oil refineries as a sulfiding agent. DMDS is also an effective soil fumigant in agriculture, registered in many states in the U.S. as well as globally. In this capacity, DMDS is an important alternative in replacing methyl bromide, which is being phased out. This pesticide is marketed as "Paladin" by Arkema.

Food use

DMDS is used to alpha substitute 2-methylfuran-acrolein to produce a food stuff used in concentrations from 0.02 ppm up to 50 ppm.[clarification needed]

Industrial use

DMDS is a stable pale yellow liquid which works as an effective product in the sulfiding process because of its high sulfur content. It is the sulfiding industry's reagent of choice because it offers more sulfur per pound of reagent when compared to its nearest competitor dimethyl sulfide.

DMDS also works as an effective product for operators in the petrochemicals industry who must protect their steam-cracking coils against the formation of coke and carbon monoxide.

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.