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Dimethyl disulfide (DMDS) is an organic chemical compound with the molecular formula CH3SSCH3 which is the simplest disulfide. It is a flammable liquid with an unpleasant, garlic-like odor.
Chemical Name: Dimethyl disulfide
Chemical Structure:
CAS No.: 624-92-0
Molecular Fomula: C2H6S2
Molecular weight: 94.2
Appearance: clear colorless liquid
Other names
Dimethyl disulfide
Methyl disulfide
Methyldisulfide
Dimethyldisulfide
Methyldithiomethane
2,3-Dithiabutane
Dimethyl disulfide Usage
1. Used as a solvent, a passivator for a catalyst, a pesticide intermediate and a coking inhibitor
2. Dimethyl disulfide reacts with cresol to form 2-methyl-4-hydroxybenzyl sulfide, which is then condensed with O, O-dimethylsulfuryl chloride in an alkaline medium to obtain fenthion. Fenthion is a highly effective and low-toxic organophosphorus insecticide with excellent control effects on rice aphids, soybean borers and burdock larvae.
3. Used as a fuel and lubricant additive
4. It is the main raw material of methylsulfonyl chloride and methanesulfonic acid.
Application
Used as a solvent and pesticide intermediate. In the petroleum refining industry, it is widely used in the hydrodesulfurization of naphtha, gasoline, kerosene, diesel and atmospheric heavy oil, the activation of hydrotreatment and the presulfidation of hydrocracking catalysts. For pesticides, it is used to produce fenthion.
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, however less effective than the former.
Industrial use
DMDS is a stable pale yellow liquid which works as an effective product for sulfiding hydroprocessing catalysts because of its high sulfur content and low decomposition temperature. Most refineries utilize DMDS instead of other sulfur spiking agents for catalyst sulfiding because it has more sulfur per pound than dimethyl sulfide (DMS) or di-tertiary-butyl polysulfide (TBPS). Once injected to a hydrotreater or hydrocracker, DMDS decomposes to form H2S. The H2S reacts with the metal oxides on the catalyst, converting them to the active metal sulfide form.
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