Dimethyl Phosphite
Dimethyl Phosphite is a versatile organophosphorus compound widely used as an intermediate in the production of pesticides, flame retardants, and other specialty chemicals. It is a clear, colorless liquid with a characteristic odor and offers excellent stability under normal conditions.
Technical Specifications
- Chemical Formula: (CH3O)2P(O)H
- Molecular Weight: 110.06 g/mol
- Appearance: Colorless to pale yellow liquid
- Odor: Characteristic phosphite odor
- Purity: ≥98% (GC)
- Density: 1.20 g/cm³ at 20°C
- Boiling Point: 170-172°C
- Flash Point: 73°C (closed cup)
- Solubility: Miscible with most organic solvents
| Parameter | Specification | Test Method |
|---|---|---|
| Assay (GC) | ≥98% | ASTM E260 |
| Water Content | ≤0.2% | Karl Fischer |
| Acidity (as H3PO4) | ≤0.1% | Titration |
| Color (APHA) | ≤50 | ASTM D1209 |
| Refractive Index (20°C) | 1.4070-1.4100 | ASTM D1218 |
Dimethyl Phosphite FAQ
What are the main applications of Dimethyl Phosphite?
Dimethyl Phosphite is primarily used as a key intermediate in the synthesis of organophosphorus compounds. Major applications include: production of pesticides and insecticides, manufacturing of flame retardants, synthesis of pharmaceuticals, and as a reagent in organic synthesis. It's particularly valuable in the production of glyphosate herbicides.
How should Dimethyl Phosphite be stored?
Dimethyl Phosphite should be stored in tightly sealed containers in a cool, dry, well-ventilated area away from heat sources and incompatible materials. Ideal storage temperature is between 15-25°C. Containers should be made of stainless steel, polyethylene, or glass. Avoid contact with oxidizing agents and strong bases during storage.
What safety precautions are required when handling Dimethyl Phosphite?
Always wear appropriate PPE including chemical-resistant gloves, safety goggles, and protective clothing. Work in a well-ventilated area or under fume hood. Avoid inhalation of vapors and contact with skin or eyes. In case of spillage, absorb with inert material and dispose properly according to local regulations. Have emergency eyewash and shower facilities available in the working area.
Packaging Options
- 200kg steel drums
- 1000kg IBC containers
- Bulk tanker trucks (20MT)
- Custom packaging available upon request
Additional Technical Information
| Property | Value |
|---|---|
| Vapor Pressure | 0.6 mmHg at 20°C |
| Viscosity | 2.1 cP at 25°C |
| Dielectric Constant | 16.5 at 20°C |
| Autoignition Temperature | >200°C |
| Explosion Limits | 1.2-12.5% (v/v in air) |
Dimethyl Phosphite FAQ (Continued)
What is the shelf life of Dimethyl Phosphite?
When stored properly in sealed containers under recommended conditions, Dimethyl Phosphite typically has a shelf life of 24 months from the date of manufacture. The product should be protected from moisture and extreme temperatures to maintain quality. Always check for any changes in appearance or odor before use if the material has been stored for extended periods.
Can Dimethyl Phosphite be customized for specific applications?
Yes, we can provide customized grades of Dimethyl Phosphite with varying purity levels, specialized packaging, or with specific additive packages to meet unique application requirements. Technical modifications might include ultra-high purity grades (>99.5%) for pharmaceutical applications or stabilized formulations for extended shelf life in challenging environments.
What transportation regulations apply to Dimethyl Phosphite?
Dimethyl Phosphite is classified as UN 3278, ESTERS, N.O.S. (Dimethyl phosphite), 3, PG III for transport. It falls under Hazard Class 3 (Flammable Liquid) with a packing group III designation. Proper shipping documents must include the technical name in parentheses. Always comply with local, national, and international regulations (DOT, IMDG, IATA) when transporting this chemical.
Quality Standards & Compliance
- Manufactured in compliance with ISO 9001:2015 standards
- REACH registered
- Meets USP/NF specifications for pharmaceutical applications
- Batch traceability maintained through full documentation
- Comprehensive Certificate of Analysis provided with each shipment
Dimethyl Phosphite FAQ (Continued)
What analytical methods are used for quality control of Dimethyl Phosphite?
Our quality control laboratory employs multiple analytical techniques including gas chromatography (GC) for purity assessment, Karl Fischer titration for water content determination, potentiometric titration for acidity measurement, and various spectroscopic methods for impurity profiling. Each production batch undergoes rigorous testing against established specifications before release.
How does Dimethyl Phosphite compare to similar phosphite esters?
Compared to other dialkyl phosphites, Dimethyl Phosphite offers higher reactivity due to its smaller alkyl groups, making it preferable for many synthesis applications. It has lower viscosity than higher homologs and better solubility in polar solvents. However, it may be more volatile and have stronger odor compared to higher molecular weight phosphites like diethyl or diphenyl phosphite.
What environmental considerations apply to Dimethyl Phosphite?
Dimethyl Phosphite should be prevented from entering waterways or soil. It is readily biodegradable (OECD 301D) but may cause oxygen depletion in water systems. The compound has low bioaccumulation potential and moderate aquatic toxicity (LC50 for fish >100 mg/L). Proper waste treatment methods include incineration in approved facilities with energy recovery.