Colorless Dimethyl Ether C2H6O Highly Flammable Dme Dimethyl Ether

DME product introduction

Product description

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.

Specification Parameters

Preparation method

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

Application

Methyl ethre 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 coating, as a variety of aerosol propellants. Fuel additives promoted abroad have many unique uses in the pharmaceutical, dye and pesticide industries.

Safety

The property is weaker than ethre. When the concentration is below 7.5mg/L, it can cause mild discomfort to the human body, anesthesia can occur in 23min, and loss of consciousness after 26min. The concentration of mice is about 12%. Contact with the skin can 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. See ethre. Storage and transportation shall be in accordance with the regulations for flammable goods.

Production method of DME

Methanol dehydration method

Methanol dehydration method is one of the main methods for producing dimethyl ethre. This method uses methanol to undergo a dehydration reaction under the action of a catalyst (such as γ-alumina, ion exchange resin, etc.) to produce DME. The reaction equation is: 2CH3OH → CH3OCH3 + H2O. This method has a simple process and low cost, and is currently the mainstream technology for industrial production of DME.

Synthesis gas production method

The synthesis gas production method uses synthesis gas (a mixture of CO and H2) as a raw material to prepare dimethyl ethre through a one-step or two-step method. The one-step method refers to the direct generation of dimethyl ethre from synthesis gas under the action of a catalyst, and the reaction equation is: 2CO + 4H2 → CH3OCH3 + H2O. The two-stage method refers to first converting synthesis gas into methanol, and then dehydrating methanol to produce dimethyl ethre. This method has the advantages of a wide range of raw material sources and high production efficiency.

Market prospects of dimethyl ethre

With the growth of global energy demand and the improvement of environmental protection awareness, dimethyl ethre, as a clean energy and important chemical raw material, has shown a rapid growth trend in market demand. Especially in China, the DME industry has received strong support from the government and has huge market potential in the future. With the continuous improvement of production technology and the continuous expansion of application fields, the economic and social benefits of DME will be further improved.

Conclusion

Due to its unique physical and chemical properties, dimethyl ethre has a wide range of applications in fuel, refrigerant, foaming agent and chemical raw materials. Methanol dehydration method and synthesis gas preparation method are the main production methods, and dimethyl ethre has broad market prospects. In the future, with the continuous advancement of technology and the continuous expansion of application scope, dimethyl ethre is expected to play a more important role in modern industry and promote the sustainable development of economy and environment.