DIMETHYL ETHER

GENERAL

Dimethyl ether (DME) is a carbinol downstream product. Dimethyl ether is non-corrosive to metals, stable under high temperature or high humidity conditions, containing no chlorine fluoride hydrocarbon. It is a substitute for freon.

PHYSICAL PROPERTY & DESCRIPTION

CAS NO.

STRUCTURE

Appearance: Colorless gas with a characteristic, sweet, ether odor detectable at 0.33 ppm.
Solubility: 6.9 g/100 mL
Density: 0.7134
Boiling Point: 34.6
Melting Point: -116.3
Vapor Density (Air=1):2.6
Vapor Pressure (mm Hg):442
Evaporation Rate (BuAc=1):37.5

115-10-6

 DIMETHYL ETHER

SYNONYM

Methyl Ether

MOL WT.

C2H6O
46.07

PRECAUTION IN HANDLING

Avoid breathing high concentrations of vapors and avoid liquid contact with skin or eyes. Use in well-ventilated area away from possible ignition sources. Lines and equipment which will contain dimethyl ether should be pretested with nitrogen using soapy water to detect leaks. Use with sufficient ventilation to keep employee exposure below recommended limits. Storage Keep container tightly closed and away from heat, sparks and flame. Keep container in a cool, clean and dry area. Do not heat above 52 deg C (125 deg F). Store away from oxygen cylinders or other oxidizing materials and possible ignition sources. Ground all equipment and cylinders before use.

APPLICATION

DME is used in spray paint, hair spray, air refresher, auto aerosol preparation, spray insecticide and in the production of high purity dimethyl sulfate. It is also used in dyestuffs and other chemical industries as a solvent and extracting agent. DME has also been successfully developed as cryogen.

SPECIFICATION

Purity

WT%

Min 99.9

Carbon Dioxide

ppm

Max 100

Free MEOH

ppm

Max 100

Methyl Formate

ppm

Max 100

Evaporation Residue

ppm

Max 20

Specific Gravity(20)

-

0.67±0.01

Moisture

ppm

Max 100

Appearance

-

Color Less

Non Volatile Residue

ppm

-

Acidity

ppm

-

Peroxide

-

-

Aldehyde

mg/100ml

-

Acetylene

ppm

-

Color

APHA

-

Boiling Point

-24.8

Freezing Point

-141.5

Flash Point

-41

Auto Ignition Point

350

Vapor Pressure

Hg(20)

3,982

Vapor Density (Air=1)

-

1.56

Solubility In H2O

WT%(20)

7

LEL

VOL %

3.45

UEL

VOL %

26.7

Evaproation Rate(BUAL=1)

-

209

GENERAL DESCRIPTION OF ETHER

Ether is any of a number of organic compounds characterized by an oxygen atom joined by two carbon atoms that are part of hydrocarbon groups. The general formula is ROR', where R and R' are alkyl groups. Ethers are formed by the condensation of two alcohols. They are similar to alcohols but are generally less dense, less soluble in water, and have lower boiling points. They are relatively unreactive chemically. This unreactive property makes ethers valuable as solvents. Common names of ethers simply list the alkyl groups in alphabetical order (ethyl methyl ether, IUPAC name is methoxyethane). Epoxides and crown ethers are a special class of cyclic ethers. Epoxide (oxirane) is a three-membered cyclic ether in which an oxygen atom is joined to each of two carbon atoms that are already bonded to each other. Crown Ether is a macrocyclic polyether whose structure contains hydrogen, carbon and oxygen atoms. Each oxygen atoms are confined between two carbon atoms and exhibits a conformation with a hole (accordingly called "crown").