demeond
Methyl Ether
CAS: 115-10-6;157621-61-9
Molecular Formula: C2H6O
demeond - Names and Identifiers
demeond - Physico-chemical Properties
| Molecular Formula | C2H6O |
| Molar Mass | 46.07 |
| Density | 1.617 |
| Melting Point | −141°C(lit.) |
| Boling Point | −24.8°C(lit.) |
| Flash Point | -41°C |
| Water Solubility | soluble |
| 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. |
| Vapor Presure | >760 mm Hg ( 25 °C) |
| Vapor Density | 1.62 (vs air) |
| Odor | Chloroform-like; sweet. |
| Merck | 6071 |
| BRN | 1730743 |
| Stability | Stable. Extremely flammable. Note low flash point. May form explosive mixtures with air. May form peroxides during prolonged storage. |
| Explosive Limit | 27% |
| Refractive Index | 1.2984 |
| Physical and Chemical Properties | Colorless and easily liquefied gas, with slightly bright flame when burning. melting point -141.5 ℃ boiling point -24.9 ℃ relative density 1.617 flash point -41.4 ℃ soluble in water, gasoline, carbon tetrachloride, benzene, chlorobenzene, acetone and methyl acetate. |
| Use | Used as a solvent, refrigerant, spray, etc |
demeond - Risk and Safety
| Hazard Symbols | F+ - Highly flammable |
| Risk Codes | 12 - Extremely Flammable |
| Safety Description | S9 - Keep container in a well-ventilated place. S16 - Keep away from sources of ignition. S33 - Take precautionary measures against static discharges. |
| UN IDs | UN 1033 2.1 |
| WGK Germany | 1 |
| RTECS | PM4780000 |
| FLUKA BRAND F CODES | 4.5-31 |
| Hazard Class | 2.1 |
demeond - Upstream Downstream Industry
| Downstream Products | 2-Amino-4-acetamino anisole |
demeond - Nature
Open Data Verified Data
colorless and easily liquefied gas, the flame is slightly bright when burning. Boiling point -24.9 °c. Melting Point -141.5 °c. Flash point (Open Cup)-41.4 °c. Relative density 1.617 (Air 1). The liquid density was 0.661G/cm3. The critical pressure is 5. 32MPa and the critical temperature is 128.8 ℃. Spontaneous ignition point 350. Explosion limit (in air) 3.45% ~ 26.7% (volume). Critical density 0.2174G/rnL, surface tension (gas phase) 18MNM (- 20 °c). Gas viscosity 85. 5uPa.s(20 °c). Soluble in water, gasoline, carbon tetrachloride, benzene, chlorobenzene, acetone and methyl acetate.
Last Update：2024-01-02 23:10:35
demeond - Preparation Method
Open Data Verified Data
- methanol catalytic dehydration method methanol vapor is obtained by gas phase dehydration over aluminum phosphate catalyst at 350-400 ℃ and 1. 4709MPa.
- trimethyl orthoformate method
Last Update：2022-01-01 10:15:49
demeond - Use
Open Data Verified Data
methyl ether is mainly used as a methylating agent for the production of dimethyl sulfate, and can also be used to synthesize N,N-dimethylaniline, methyl acetate, acetic anhydride, ethylene and ethylene, etc, solvent, leaching agent, extraction agent, anesthetic, civil composite ethanol and Freon aerosol substitutes for hair care, skin care, drugs and coatings, as all kinds of aerosol propellant. Fuel additives promoted abroad have many unique uses in the pharmaceutical, dye and pesticide industries.
Last Update：2022-01-01 10:15:50
demeond - Safety
Open Data Verified Data
- anesthesia was weaker than ether. When the concentration is below 7.5 mg/L, it can cause mild discomfort to the human body, 23min can cause anesthesia, and 26min after loss of consciousness. The anesthetic concentration in mice was about 12%. Skin contact may cause dermatitis. Operators should wear masks and rubber gloves.
- methyl ether is flammable and explosive. Special attention should be paid to avoiding sources of fire and pressurized steam during production, handling, storage, and transport. See ethyl ether. According to the provisions of flammable storage and transportation.
Last Update：2022-01-01 10:15:49
demeond - Reference Information
| olfactory Threshold | 500ppm |
| LogP | 0.07 at 25℃ |
| NIST chemical information | information provided by: webbook.nist.gov (external link) |
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Introduction | dimethyl ether (DME) is a flammable gas. Mixing with air can form an explosive mixture. Exposure to heat, Mars, flames or oxidants is prone to combustion and explosion. Contact with air or in light conditions can generate a potential explosion risk of peroxide, the density is larger than the air, can be spread to a relatively far place at a lower point, the fire source will fire back. In case of high fever, the internal pressure of the container increases, and there is a risk of cracking and explosion. |
| Application | dimethyl ether is mainly used as a methylation reagent for the production of dimethyl sulfate, and can also be used to synthesize N,N-dimethylaniline, methyl acetate, acetic anhydride, ethylene dimethyl ester and ethylene; Can also be used as alkylating agent, refrigerant, foaming agent, solvent, leaching agent, extraction agent, anesthetic, fuel, civil composite ethanol and substitute for Freon aerosol. Used in hair care, skin care, drugs and coatings, as all kinds of aerosol propellant. Fuel additives promoted abroad have many unique uses in the pharmaceutical, dye and pesticide industries. |
| purpose | mainly used as raw materials for organic synthesis, also used as solvents, aerosols, dimethyl ether 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 substitute for refrigerant, foaming agent, solvent, leaching agent, extractant, anesthetic, fuel, civilian composite ethanol and Freon aerosol. Used in hair care, skin care, drugs and coatings, as all kinds of aerosol propellant. Fuel additives promoted abroad have many unique uses in the pharmaceutical, dye and pesticide industries. The US-based oil company MOBL has issued a patent for the dehydration of methanol to ethylene via dimethyl ether. used as solvent, refrigerant, spray, etc. |
| production method | is mainly obtained as a by-product in the production of synthetic methanol, however, with the wide application of copper-based catalyst-based low pressure methanol technology, the content of dimethyl ether in crude methanol has been very small. In small-scale production, methanol catalytic dehydration method can be used, there are two kinds of liquid phase method and gas phase method. The liquid phase method is to heat a mixture of methanol and sulfuric acid to obtain dimethyl ether. Gas phase method is the methanol vapor through alumina or crystalline aluminum silicate (also can be ZSM-5 type molecular sieve) solid catalyst, gas phase dehydration to produce dimethyl ether. It can be decomposed from trimethyl orthoformate in laboratory with ferric chloride as catalyst (yield 95%). High purity methyl ether can be obtained from methyl iodide and sodium methoxide by the synthesis method of Williams. |
| category | hazardous gas |
| toxicity grade | poisoning |
| Acute toxicity | inhalation-rat LC50: 308000 mg/m3; Inhalation-mouse LC50: 386 PPM/30 min |
| explosive hazard characteristics | open flame mixed with air, thermal explosion |
| flammability hazard characteristics | open flame, combustible under heat; Toxic fluoride smoke from combustion |
| storage and transportation characteristics | The warehouse is ventilated and dried at low temperature; Light loading and light unloading; And oxygen, separate storage of |
| fire extinguishing agent | water, foam, carbon dioxide mist |
| Occupational Standard | TWA 1910 mg/m3 |
| spontaneous combustion temperature | 662 ° F. |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
Last Update：2024-04-09 21:04:16
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View History
demeond
N-ALPHA-(9-FLUORENYLMETHYLOXYCARBONYL)-L-GLUTAMIC-ACID-GAMMA-T-BUTYL ESTER
十六酸季戊四醇酯
3β,16α,22α-Trihydroxyolean-12-en-28-al
IODOTRIMETHYLSILANE
4-{2-(1-Piperidino)ethoxy}benzoic acid HCl
2,6-Ethanonaphtho[2,3-b:6,7-b']bisoxirene (9CI)
7-Oxabicyclo[2.2.1]heptane-2,3-dicarboxylic acid, 2-[2-(methylthio)ethyl] ester
N-ALPHA-(9-FLUORENYLMETHYLOXYCARBONYL)-L-GLUTAMIC-ACID-GAMMA-T-BUTYL ESTER
十六酸季戊四醇酯
3β,16α,22α-Trihydroxyolean-12-en-28-al
IODOTRIMETHYLSILANE
4-{2-(1-Piperidino)ethoxy}benzoic acid HCl
2,6-Ethanonaphtho[2,3-b:6,7-b']bisoxirene (9CI)
7-Oxabicyclo[2.2.1]heptane-2,3-dicarboxylic acid, 2-[2-(methylthio)ethyl] ester
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