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Dimethyl ether

Dimethyl ether
Dimethyl ether
CAS No.
115-10-6
Chemical Name:
Dimethyl ether
Synonyms
RE170;dymela;RE-170;Dymel A;demeond;(CH3)2O;woodether;Wood ether;ether,methyl;METHYL OXIDE
CBNumber:
CB8765901
Molecular Formula:
C2H6O
Formula Weight:
46.07
MOL File:
115-10-6.mol

Dimethyl ether Properties

Melting point:
−141 °C(lit.)
Boiling point:
−24.8 °C(lit.)
Density 
1.617
vapor density 
1.62 (vs air)
vapor pressure 
>760 mm Hg ( 25 °C)
refractive index 
1.2984
Flash point:
-41°C
solubility 
Soluble in acetone, chloroform, ethanol (95%), ether, and 1 in 3 parts of water. Dimethyl ether is generally miscible with water, nonpolar materials, and some semipolar materials. For pharmaceutical aerosols, ethanol (95%) is the most useful cosolvent. Glycols, oils, and other similar materials exhibit varying degrees of miscibility with dimethyl ether.
Odor
Chloroform-like; sweet.
explosive limit
27%
Water Solubility 
soluble
Merck 
6071
BRN 
1730743
Stability:
Stable. Extremely flammable. Note low flash point. May form explosive mixtures with air. May form peroxides during prolonged storage.
CAS DataBase Reference
115-10-6(CAS DataBase Reference)
NIST Chemistry Reference
Dimethyl ether(115-10-6)
EPA Substance Registry System
Methane, oxybis-(115-10-6)
SAFETY
  • Risk and Safety Statements
  • Hazard and Precautionary Statements (GHS)
Hazard Codes  F+
Risk Statements  12
Safety Statements  9-16-33
RIDADR  UN 1033 2.1
WGK Germany  1
RTECS  PM4780000
4.5-31
Autoignition Temperature 662 °F
HazardClass  2.1
Hazardous Substances Data 115-10-6(Hazardous Substances Data)
Symbol(GHS):
Signal word: Danger
Hazard statements:
Code Hazard statements Hazard class Category Signal word Pictogram P-Codes
H220 Extremely flammable gas Flammable gases Category 1 Danger P210, P377, P381, P403
H280 Contains gas under pressure; may explode if heated Gases under pressure Compressed gas
Liquefied gas
Dissolved gas
Warning P410+P403
Precautionary statements:
P210 Keep away from heat/sparks/open flames/hot surfaces. — No smoking.
P377 Leaking gas fire: Do not extinguish, unless leak can be stopped safely.
P381 Eliminate all ignition sources if safe to do so.
P410+P403 Protect from sunlight. Store in a well-ventilated place.

Dimethyl ether price More Price(3)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 295299 Dimethyl ether ≥99% 115-10-6 100g $170 2018-11-20 Buy
Sigma-Aldrich 295299 Dimethyl ether ≥99% 115-10-6 1kg $403 2018-11-20 Buy
Sigma-Aldrich 295299 Dimethyl ether ≥99% 115-10-6 400g $231 2018-11-20 Buy

Dimethyl ether Chemical Properties,Uses,Production

Chemical Properties

colourless gas

Chemical Properties

Dimethyl ether is a liquefied gas and exists as a liquid at room temperature when contained under its own vapor pressure, or as a gas when exposed to room temperature and pressure.
It is a clear, colorless, virtually odorless liquid. In high concentrations, the gas has a faint ether-like odor.

Uses

Dimethyl ether is used as a solvent in aerosol formulations.

Production Methods

Dimethyl ether is prepared by the reaction of bituminous or lignite coals with steam in the presence of a finely divided nickel catalyst. This reaction produces formaldehyde, which is then reduced to methanol and dimethyl ether. Dimethyl ether may also be prepared by the dehydration of methanol.

Definition

ChEBI: An ether in which the oxygen atom is connected to two methyl groups.

Uses

Aerosol propellant; alternative diesel fuel; chemical intermediate.

General Description

Dimethyl ether is a colorless gas with a faint ethereal odor. Dimethyl ether is shipped as a liquefied gas under its vapor pressure. Contact with the liquid can cause frostbite. Dimethyl ether is easily ignited. Its vapors are heavier than air. Any leak can be either liquid or vapor. Dimethyl ether can asphyxiate by the displacement of air. Under prolonged exposure to fire or intense heat the containers may rupture violently and rocket.

Air & Water Reactions

Highly flammable. Upon standing and exposure to air (oxygen) tendency to form explosive peroxides. When ethers containing peroxides are heated (distilled) they can detonate [Lewis, 3rd ed., 1993, p. 854].

Reactivity Profile

Dimethyl ether is a colorless, highly flammable gas (b. p. -24° C), slightly toxic. Very dangerous fire and explosion hazard when exposed to flame, sparks, heat or strong oxidizers. Violent reaction with aluminum hydride, lithium aluminum hydride. Upon standing and exposure to air (oxygen) tendency to form explosive peroxides. When ethers containing peroxides are heated (distilled) they can detonate [Lewis, 3rd ed., 1993, p. 854].

Health Hazard

Inhalation produces some anesthesia (but less than that of ethyl ether), blurring of vision, headache, intoxication, loss of consciousness. Liquid or concentrated vapor irritates eyes. Contact of liquid with skin may cause frostbite.

Fire Hazard

Behavior in Fire: Containers may explode. Vapors are heavier than air and may travel long distance to a source of ignition and flash back.

Fire Hazard

Flash Point: Not pertinent (flammable gas); Flammable Limits in Air (%): 2-50; Fire Extinguishing Agents: Let fire burn; shut off gas flow; cool exposed surroundings with water; Fire Extinguishing Agents Not To Be Used: Not pertinent; Special Hazards of Combustion Products: Not pertinent; Behavior in Fire: Containers may explode. Vapors are heavier than air and may travel long distance to source of ignition and flash back; Ignition Temperature (°F): 662; Electrical Hazard: Data not available; Burning Rate: 6.6 mm/min.

Chemical Reactivity

Reactivity with Water No reaction; Reactivity with Common Materials: No reaction; Stability During Transport: Stable; Neutralizing Agents for Acids and Caustics: Not pertinent; Polymerization: Not pertinent; Inhibitor of Polymerization: Not pertinent.

Pharmaceutical Applications

Dimethyl ether may be used as an aerosol propellant for topical aerosol formulations in combination with hydrocarbons and other propellants. Generally, it cannot be used alone as a propellant owing to its high vapor pressure. Dimethyl ether is a good solvent and has the unique property of high water solubility, compared to other propellants. It has frequently been used with aqueous aerosols. A coarse, wet, spray is formed when dimethyl ether is used as a propellant.
Dimethyl ether is also used as a propellant in cosmetics such as hair sprays,and in other aerosol products such as air fresheners and fly sprays.
Dimethyl ether is additionally used as a refrigerant.

Safety Profile

Slightly toxic by inhalation. Very dangerous fire hazard when exposed to heat, flame, or oxidzers. Dangerous explosion hazard when exposed to flame, sparks, etc. Violent reaction with AH3 and LiAlH2. Keep in closed container away from heat and open flame. To fight fire, stop flow of gas. When heated to decomposition it emits acrid smoke and irritating fumes.

Safety

Dimethyl ether may be used as a propellant and solvent in topical pharmaceutical aerosols, and is generally regarded as an essentially nontoxic and nonirritant material when used in such applications. However,inhalation of high concentrations of dimethyl ether vapor is harmful. Additionally, skin contact with dimethyl ether liquid may result in freezing of the skin and severe frostbite.
When used in topical formulations, dimethyl ether may exert a chilling effect on the skin, although if it is used as directed the propellant quickly vaporizes and is nonirritating.
LD50 (mouse, inhalation): 386000ppm/30min
LD50 (rat, inhalation): 308g/m3

storage

The liquefied gas is stable when used as a propellant. However, exposure to the air for long periods of time may result in explosive peroxides being slowly formed.
Solutions of liquid dimethyl ether should not be concentrated either by distillation or by evaporation. Dimethyl ether should be stored in tightly closed metal cylinders in a cool, dry place.

Purification Methods

Dry methyl ether by passing over alumina and then BaO, or over CaH2, followed by fractional distillation at low temperatures. Its solubility is 37mL per mL of H2O at 18o, and it is very soluble

Incompatibilities

Dimethyl ether is an aggressive solvent and may affect the gasket materials used in aerosol packaging. Oxidizing agents, acetic acid, organic acids, and anhydrides should not be used with dimethyl ether.

Regulatory Status

Included in the FDA Inactive Ingredients Database (topical aerosols). Included in nonparenteral medicines licensed in the UK. Included in the Canadian List of Acceptable Non-medicinal Ingredients.

Dimethyl ether Preparation Products And Raw materials

Raw materials

Preparation Products


Dimethyl ether Suppliers

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Dimethyl ether Spectrum


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