What is Dimethyl Sulfide (DMS)?

Dimethyl sulfide is an organic sulfur compound with CAS 75-18-3 and molecular formula C₂H₆S. It is a low-boiling, strong-smelling liquid or gas used mainly as a sulfur source and intermediate.

What is DMS used for?

It is used as a sulfiding agent for hydrotreating catalysts in refineries, as a sulfur source in chemical synthesis, and as a feedstock for dimethyl sulfoxide production. It may also be used in gas odorants.

What specifications should be checked before ordering?

Confirm assay, water, sulfur-containing impurities, dimethyl disulfide content, color and odor profile. The specification summary should state the actual purity and test method because sulfur speciation can affect catalyst presulfiding.

How should Dimethyl Sulfide be stored and handled?

Store in tightly sealed containers in a cool, well-ventilated area away from heat, sparks and strong oxidizers. Use odor control, appropriate ventilation and PPE, and follow the safety information for spill, disposal and first-aid procedures.

Why is dimethyl disulfide content important for catalyst presulfiding?

Dimethyl disulfide can form as an oxidation or sulfur-coupling byproduct and changes the available sulfur speciation during catalyst sulfiding. Controlling this impurity helps produce a consistent sulfide phase on CoMo or NiMo hydrotreating catalysts.

Dimethyl Sulfide (DMS) CAS 75-18-3

Dimethyl Sulfide (DMS, methyl sulfide), CAS 75-18-3, is a volatile organosulfur compound used as a presulfiding agent for refinery hydrotreating catalysts and as the main raw material for dimethyl sulfoxide (DMSO). Confirm the required grade and specification, then request a quotation with COA/TDS/SDS for bulk supply.

CAS: 75-18-3
Synonyms: DMS, Methyl sulfide, Thiobismethane, 2-Thiapropane, Methylthiomethane
Einecs: 200-846-2
Molecular Formula: C₂H₆S
Grade: Industrial grade 99%
Package: 200kg iron drum or 50kg plastic drum packing

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Product Description

Dimethyl Sulfide (DMS), CAS 75-18-3, is methyl sulfide, the simplest thioether; the EC/EINECS number is 200-846-2.

Synonyms: DMS; Methyl sulfide; Thiobismethane; 2-Thiapropane; Methylthiomethane.

CAS: 75-18-3.

Molecular formula: C₂H₆S.

Molecular weight: 62.13.

EC number: 200-846-2.

It is a colorless, highly volatile liquid with a strong cabbage-like odor; the melting point is about -98 °C, the boiling point about 37-38 °C and the density about 0.846 g/cm³. It is slightly soluble in water and miscible with most organic solvents.

It is highly flammable, with a flash point below -30 °C; store and handle it away from heat, sparks and ignition sources.

It is produced from black liquor in kraft pulping or by reaction of methanol with hydrogen sulfide.

It is used as a presulfiding agent to activate hydrodesulfurization (HDS) catalysts in refineries.

It is the main raw material for dimethyl sulfoxide (DMSO) production.

It serves as a sulfur source in fine chemical synthesis and as a trace flavor component.

Confirm assay, water, sulfur-containing impurities, dimethyl disulfide content, color and odor profile.

Store in tightly sealed containers in a cool, well-ventilated area away from heat, sparks and strong oxidizers; use ventilation, explosion-proof equipment and suitable PPE.

Confirm the current product-specific specification.

Confirm packaging with the requested quantity and destination requirements.

Document requirements should be confirmed from the current specification, SDS, COA, or other product-specific files.

The page is an RFQ entry point and does not state stock, price, MOQ, or fixed lead time.

For an RFQ, state the intended use, required specification, quantity, packaging, destination, and document needs.

FAQ - Technical & Supply Chain

Q:
What is Dimethyl Sulfide (DMS)?

A: Dimethyl sulfide is an organic sulfur compound with CAS 75-18-3 and molecular formula C₂H₆S. It is a low-boiling, strong-smelling liquid or gas used mainly as a sulfur source and intermediate.
Q:
What is DMS used for?

A: It is used as a sulfiding agent for hydrotreating catalysts in refineries, as a sulfur source in chemical synthesis, and as a feedstock for dimethyl sulfoxide production. It may also be used in gas odorants.
Q:
What specifications should be checked before ordering?

A: Confirm assay, water, sulfur-containing impurities, dimethyl disulfide content, color and odor profile. The specification summary should state the actual purity and test method because sulfur speciation can affect catalyst presulfiding.
Q:
How should Dimethyl Sulfide be stored and handled?

A: Store in tightly sealed containers in a cool, well-ventilated area away from heat, sparks and strong oxidizers. Use odor control, appropriate ventilation and PPE, and follow the safety information for spill, disposal and first-aid procedures.
Q:
Why is dimethyl disulfide content important for catalyst presulfiding?

A: Dimethyl disulfide can form as an oxidation or sulfur-coupling byproduct and changes the available sulfur speciation during catalyst sulfiding. Controlling this impurity helps produce a consistent sulfide phase on CoMo or NiMo hydrotreating catalysts.

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