Dimethyl carbonate

1. Nature: colorless, transparent liquid, irritating smell. Melting point 2-4 ℃, the boiling point 90.2 ℃, the relative density of 1.073 (20 / 4 ℃), refractive index of 1.3697, flash point (a cup) 21.7 ℃, viscosity 0.664 mPa • s. Soluble in alcohol, ether and other organic solvents, do not dissolve in water. 
2. Preparation: 1. Methyl chloride from ([79-22-1]) and methanol derived from responses. Reaction of raw materials used in the methyl chloride and methanol from the reaction of phosgene, preparation, this can also be product-gasification without separation, by adding methanol to return excessive reaction to synthetic DMC. The response is the traditional method of phosgene. 2. Transesterification law by the ethylene carbonate or propylene carbonate and methanol to transesterification reactions, can be obtained DMC. This method of high yield, equipment corrosive small, mild reaction conditions, but the source of raw materials by the petrochemical industry development constraints and elements of a low utilization rate. 3. Carbonyl method of methanol, carbon monoxide and oxygen under the direct role of catalyst in the synthesis of DMC. This method was easy to cheaper raw materials, toxic small, simple process, is the most promising approaches. The classification process can be divided into law and liquid gas, gas law can be divided into one-step and two-step method. Among them, liquid methanol carbonylation of law and Gas of carbonylation two-step method to achieve industrialization and gas methanol carbonylation of one-step is still in development. 4. Methanol and CO2 response of law. This process is still in the development of the road. 5. Methanol and urea synthesis reaction. This process is still in the development of the road.