Dimethyl DME - Properties

Colorless, easily liquefied gas, with a slightly bright flame when burning. Boiling point -24.9℃. Melting point -141.5℃. Flash point (open cup) -41.4℃. Relative density 1.617 (air-1). Liquid density 0.661g/cm3. Critical pressure 5.32MPa, critical temperature 128.8℃. Autoignition point 350℃. Explosion limit (in air) 3.45%~26.7% (volume). Critical density 0.2174g/rnL, surface tension (gas phase) 18mNm (-20℃). Gas viscosity 85.5uPa.s (20℃). Soluble in water, gasoline, carbon tetrachloride, benzene, chlorobenzene, and methyl acetate.

DME - Preparation method

Methanol catalytic dehydration method Methanol vapor is dehydrated in the gas phase at 350-400℃ and 1.4709MPa through aluminum phosphate catalyst.

Trimethyl orthoformate method

DME - Uses

is mainly used as a methylating agent to produce dimethyl sulfate, and can also be used to synthesize N,N-dimethylaniline, methyl acetate, acetic anhydride, ethylene dimethyl ester and ethylene; it can also be used as a refrigerant, foaming agent, solvent, leaching agent, extractant, civilian composite ethanol and Freon aerosol substitute, used in hair care, skin care, medicine and coatings, as a variety of aerosol propellants. Fuel additives promoted abroad have many unique uses in the pharmaceutical, dye and pesticide industries.

DME - Safety

Weaker anesthetic When the concentration is below 7.5mg/L, it can cause mild discomfort to the human body, anesthesia in 23min, and loss of consciousness after 26min. The concentration of mouse anesthesia is about 12%. Contact with skin may cause dermatitis. Operators should wear masks and rubber gloves.

Methyl ethRE is flammable and explosive. Special attention should be paid to avoid fire sources and pressurized steam during production, processing, storage and transportation. Storage and transportation shall be in accordance with the regulations for flammable materials.

Specification Parameters

Characteristics

· Environmentally Friendly: Combustion produces only carbon dioxide and water, with no sulfur oxides or particulate emissions.

· High Purity: Suitable for use in sensitive applications like aerosol propellants or chemical intermediates.

· Energy Efficient: High calorific value, making it a suitable alternative to traditional fuels.

· Easily Transportable: Can be stored and transported as a liquid under moderate pressure.

Advantages / Selling Points

· Clean Energy: Emits no soot, making it ideal for applications where environmental concerns are paramount.

· Versatile Usage: Compatible with various industrial, automotive, and domestic applications.

· Cost-Effective: An economical alternative to liquefied petroleum gas (LPG) and diesel.

· Safe Storage: Stable under normal conditions, with minimal risk of degradation.

· Reliable Supply: Produced using abundant resources like methanol or natural gas, ensuring consistent availability.

Applications

· Fuel:

o Replacement for LPG in domestic and industrial cooking.

o Alternative diesel fuel for automotive and power generation.

· Aerosol Propellant:

o Widely used in cosmetics, pharmaceuticals, and household sprays.

· Chemical Feedstock:

o Used in the synthesis of dimethyl sulfate, acetic acid, and other intermediates.

· Refrigerant:

o Acts as an efficient cooling agent in refrigeration systems.

· Welding and Cutting:

o Fuel for oxy-DME welding applications.

Technology

The DME project adopts advanced methanol gas-phase catalytic dehydration technology to produce fuel-grade dme with a concentration of more than 99.0%. The fuel-grade DME is further separated through a lightness removal tower (using high-efficiency corrugated rolled perforated plate filler) to obtain refined ethre with a concentration of 99.9% and high-purity ethre with a concentration of 99.99%.

Theory

The chemical stability and low molecular weight of DME make it highly reactive for applications in energy and chemical processes. Its combustion reaction is represented as follows:
CH₃OCH₃ + 3O₂ → 2CO₂ + 3H₂O + Energytext{CH₃OCH₃ + 3O₂ → 2CO₂ + 3H₂O + Energy}CH₃OCH₃ + 3O₂ → 2CO₂ + 3H₂O + Energy

Service

· Customized Solutions: Tailored specifications for different industries.

· Logistics Support: Safe and efficient transport of DME worldwide.

· Technical Assistance: On-site and remote troubleshooting for your specific applications.

· 24/7 Customer Support: Dedicated team to address your queries anytime.

Production Process

The production of DME involves:

1. Methanol dehydration under controlled conditions using advanced solid acid catalysts.

2. Purification of the final product to ensure high purity levels (>99.99%).

3. Storage in pressurized tanks for distribution.

Operation Instructions

1. Handling: Always use DME in well-ventilated areas. Avoid inhalation or contact with the skin.

2. Storage: Store in sealed, pressurized containers away from direct sunlight or heat sources.

3. Transport: Ensure compliance with safety regulations when transporting as a liquefied gas.

Precautions

· Avoid exposure to high temperatures to prevent unintentional vaporization.

· Ensure leak-proof containers and proper safety protocols during handling.

· Use flame arrestors in systems handling DME to prevent flashback.

· Wear appropriate protective equipment (gloves, masks) during use.