1. Product Introduction & Main Application
Arnico’s Dimethyl Disulfide (DMDS) is an organic sulfur-containing liquid with a high purity and a characteristic pungent odor. It is widely used as a sulfiding agent (pre-sulfurization) for hydrotreating catalysts in refineries and as a soil fumigant and insecticide in agriculture. The exceptionally high purity of this product makes it a safe and efficient choice for activating metal catalysts.
2. Technical Specifications
| Technical Parameter | Refinery Sulfiding Grade | Agricultural Fumigant Grade | Unit |
|---|---|---|---|
| Purity | ≥ 99.5 | ≥ 99.0 | % |
| Density (20°C) | 1.062 – 1.065 | 1.062 – 1.065 | g/cm³ |
| Boiling Point | 109 – 110 | 109 – 110 | °C |
| Methyl Mercaptan (Impurity) | ≤ 0.05 | ≤ 0.2 | % |
| Water Content | ≤ 0.02 | ≤ 0.05 | % |
| Color | Clear & Colorless | Clear, Colorless to Slight Yellow | – |
3. Features & Benefits
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High Sulfidation Efficiency: Enables a direct and controlled injection of sulfur to the catalyst, resulting in faster and more complete activation compared to gaseous methods.
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Exceptional Purity: Free from heavy hydrocarbons and water, which prevents coke formation and catalyst poisoning.
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High Boiling Point: Offers superior operational safety in high-temperature refinery processes compared to its predecessor, Dimethyl Sulfide (DMS).
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Excellent Penetration Power: As a nematicide, its high vapor pressure allows easy diffusion through soil pores, effectively controlling a wide spectrum of pests.
4. Industrial Applications
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Refineries & Petrochemicals: Pre-sulfiding activation of Hydrotreating (HDT) and Hydrocracking (HCU) catalysts for the production of low-sulfur fuels.
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Agriculture: A highly effective soil fumigant against nematodes, soil-borne fungi, and weed seeds prior to planting high-value crops.
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Chemical Industry: An intermediate in the synthesis of pharmaceuticals, pesticides, and odorants for city gas.
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Animal Feed: Used as a limited additive to supply organic sulfur (methionine) in dietary rations (requires confirmation of local guidelines).
5. Safety & Handling
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MSDS (Material Safety Data Sheet): This substance is highly flammable (Flash Point ≈ 24°C) and has a very strong, disagreeable odor. Before any contact, the MSDS file and spill management procedures must be thoroughly studied.
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Storage Conditions: Store in carbon steel or stainless steel containers, sealed, away from sources of ignition, heat, and strong oxidizing agents, at a temperature below 25°C. Tanks must be blanketed with an inert gas (N₂).
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Personal Protective Equipment (PPE): When handling, the use of full anti-static workwear, a respirator with a specific organic/sulfur filter, chemical goggles, and Viton or neoprene gloves is mandatory.
6. Quality Assurance & COA
Arnico provides all DMDS shipments with a dedicated Certificate of Analysis (COA), including precise GC purity and moisture content. This guarantee helps refinery engineers accurately calculate the sulfidation injection rate, preventing damage to expensive catalyst beds.
