Polyoxymethylene dimethyl ethers (PODE/DMMn) are a class of low-molecular-weight acetal oligomers. They are colorless or pale yellow, volatile, flammable liquids with a slight ether odor at room temperature and pressure.

Basic Physical and Chemical Properties

Molecular formula: CH₃O(CH₂O)nCH₃ (n≥2, generally less than 8; n=3~6 is commonly used for diesel blending)

Appearance and state: Clear colorless or pale yellow liquid with a slight ether odor.

Solubility: Excellent solvency, freely miscible with water and most organic compounds (such as alkanes, alcohols, ethers, etc.).

Environmental characteristics: Sulfur-free, aromatic-free, and classified as green environmentally friendly chemicals.

Key Physical Parameters (vary with degree of polymerization n)

The density, boiling point, and cetane number of polyoxymethylene dimethyl ethers increase as the degree of polymerization (n value) increases.

Polyoxymethylene dimethyl ethers (PODE/DMMn) have three clear core applications:

Clean Diesel Blending Component (Primary Use)

As an eco-friendly diesel additive, it has an extremely high cetane number and high oxygen content. Adding 10%–20% to diesel without engine modification can significantly reduce soot and NOₓ emissions, while improving combustion efficiency and cold start performance.

Eco-Friendly Industrial Solvent

As a sulfur-free, aromatic-free green solvent, it can replace highly toxic solvents such as toluene and xylene, and is widely used in coatings, inks, pesticides, adhesives, metal cleaning agents, and other fields.

Other Chemical Applications

They can be used to prepare high-performance polymers and serve as environmentally friendly additives to effectively improve the oxidation stability and anti-wear properties of oil products.