Refrigerants dimethyl ether

Dimethyl ether is used as a propellant in aerosols. It is also a solvent, a fuel used in welding, and a refrigerant. In high concentrations, it has an anesthetic effect. 

The simplest of the ethers would be ether that has the simplest hydrocarbon backbones attached those backbones are the radicals of the simplest hydrocarbon, methane. Therefore, the simplest of the ethers is dimethyl ether, whose formula is CH3OCH3. Dimethyl is used because there are two methyl radicals, and "di-" is the prefix for two. This compound could also be called methyl methyl ether, or just plain methyl ether, but it is better known as dimethyl ether. It is an easily liquified gas that is extremely flammable, has a relatively low ignition temperature of 66°F, and is used as a solvent, a refrigerant, a propellant for sprays, and a polymerization stabilizer. 

Dimethyl ether is used as a refrigerant, as a propellant in aerosol products, as a starter for gasoline engines in cold weather, as a rocket propellant, and as a specialty solvent in chemical synthesis. 

Diethyl ether is a very low boiling liquid (bp 3 5°C). Dimethyl ether is a gas that is used as a refrigerant. The aliphatic ethers of higher molecular weights are liquids, and the aromatic ethers are liquids and solids. 

Dimethyl ether, the simplest form of ether, is a colorless gas at room temperature and pressure. It is noncarcinogenic, virtually nontoxic, and also non-corrosive in nature. Dimethyl ether is a liquid at the moderate pressure of approximately 496 kPa. Its handling characteristics are very similar to LPG. It is stored in conventional atmospheric pressure tanks as a refrigerated liquid (—25°C) or in pressurized tanks (5 bar)... 

Methanol can be converted to dimethyl ether (DME) by passing the vapors over a dehydration catalyst such as silica/alumina or y-alumina at temperatures of 250°C or higher. Dimethyl ether can be used as an aerosol propellant and also as a precursor to a variety of hydrocarbons and organic chemicals it also can be used as a refrigerant and a cold starting fluid for automobile engines. The reaction is [30] ... 

Demeon D Dimethyl ether DME Dymel A EINECS 204-065-8 Ether, dimethyl Ether, methyl HSDB 354 Methane, oxybis- Methoxymethane Methyl ether Methyl oxide Oxybismethane UN1033 Wood ether. Used as a solvent, motor fuel and Aerosol propellant, in refrigerants, as an extraction agent, a catalyst and stabilizer in polymerization. Gas mp = -141.5° bp = -24,8° Xm = 163,184 nm (s = 3981, 2512, gas) slightly soluble in CeHe, soluble in H20, EtOH, Et20, Me2CO. 

Bobbo, S. Camporese, R. Stryjek, R. (Vapour + liquid) equihbrium measurements and correlation of the refrigerant mixture dimethyl ether (RE170) -l- 1,1,1,3,3,3-hexafluoropropane (R236fa) at the temperatures (303.68 and 323.75) K J. Chem. Thermodyn. 1998,30,1041-1046... 

Like thiols, thioethers have strong characteristic odors The odor of dimethyl sulfide is reminiscent of oysters that have been kept in the refrigerator for too long. Sulfides are named like ethers, with sulfide replacing ether in the common names. In the IUPAC (alkoxy alkane) names, alkylthio replaces alkoxy. ... 

At. the conclusion of the reaction period, 100 ml. of water is added at a temperature below 15° (Note 9). The aqueous layer is separated and the reaction flask and organic layer are washed with a mixture of 50 ml. of water and 75 ml. of ether. The aqueous layers are combined, back-extracted with 50 ml. of ether, and acidified to Congo red with 6 N hydrochloric acid, and ( lie product is extracted with two 75-ml. portions of ether. The ether solution of product is washed with 50 ml. of saturated sodium chloride and dried over anhydrous magnesium sulfate, and the solvent is evaporated. The remaining traces of solvent may be removed in a rotary evaporator. The crude 2,2-dimethyl- I plienylbutyric acid amounts to 12—12.8 g. (83—90%), m.p. HO 01", which is suitable for many purposes. Recrystallization from 75 ml. of hexane at room temperature followed by refrigeration yields 8.4 0.7 g. (58 67%) of product as colorless needles,... 

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