Dimethyl ether Totally Explained

Everything about Dimethyl Ether totally explained

| Section2 = | Section3 = | Section7 = | SPhrases =,,, }} | Section8 = }} Dimethyl ether, also known as methoxymethane, oxybismethane, methyl ether, wood ether, and DME, is a colorless gaseous ether with an ethereal odor. Dimethyl ether gas is water soluble. It has the formula CH₃OCH₃ or as its empirical formula C₂H₆O (which it shares with ethanol). Dimethyl ether is used as an aerosol spray propellant, and is used in conjunction with propane to give a thermic expansion that lowers temperature to -60°C. This property is useful in cryogenic freezing of common warts found on the human body. Dimethyl ether is also a clean-burning alternative to liquified petroleum gas, liquified natural gas, diesel and gasoline. It can be made from natural gas, coal, or biomass.

Production

Conventional DME production uses the methanol dehydration method. For mass production of DME as a fuel other methods are being considered, the main one being DME synthesis from hydrogen and CO gas, also known as syngas.
DME can be produced from methanol by combining two methanol molecules to produce a DME molecule and a water molecule. This is a reversible reaction.

A refrigerant
A (co-)blowing agent for foam
A propellant for aerosol products
A solvent
An extraction agent
A chemical reaction medium
A fuel for welding cutting and brazing
A multi-purpose fuel

As a fuel

DME can be used as a fuel in diesel engines, petrol engines (30% DME / 70% LPG) and gas turbines. It works particularly well in diesel engines due to its high cetane number, which is greater than 55 compared to diesel which is 38-53.. only moderate modification are needed to convert a diesel engine to run on DME. The simplicity of this short carbon chain compound leads during combustion to very low emissions of particulate matter, NO_x, CO and no SO_x, meeting even the most stringent emission regulations in Europe (EURO5), U.S. (U.S. 2010) and Japan (2009 Japan).
Currently the EU is considering DME in its potential biofuel mix in 2030. and Mobil is using it in their methanol to gasoline process.

Solvent

Like ammonia (NH₃), dimethyl ether can be condensed (liquified) and used as a solvent. Clearly there are limitation on the maximum temperature (for example the boiling/reflux temperature for example -23°C) which the solvent can be used. One advantage of using dimethyl ether as a solvent is that's readily removed by evaporation, especially from a product which has a relatively low boiling point.

Further Information

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