Dimethyl carbonate (DMC) is a chemical substance with low toxicity, excellent environmental performance and a wide range of applications. The molecular structure contains functional groups such as carbonyl, methyl and methoxy, and has a variety of reaction characteristics. It is safe, convenient, less pollution and easy to produce and transport. Dimethyl carbonate is a promising "green" chemical product because of its low toxicity.
Description:
The excellent performance and special molecular structure of DMC determine the wide application of DMC, which can be summarized as follows: instead of phosgene as carbonylation agent
Although phosgene (CL co CL) has high reaction activity, its highly toxic and corrosive by-products make it face huge environmental pressure and will be gradually eliminated. DMC (ch3o-co-och3) has similar nucleophilic reaction centers. In DMC, when the carbonyl group is attacked by nucleophiles, the acyl oxygen bond breaks to form carbonyl compounds, and the by-product is methanol. Therefore, DMC can replace phosgene as a safe reaction reagent to synthesize carbonate derivatives, such as carbamate pesticides and polycarbonates. Esters, isocyanides, etc., among which polycarbonate will be the field with the highest demand for DMC. It is estimated that more than 80% of DMC will be used to produce polycarbonate in 2005.
Instead of dimethyl sulfate. Dimethyl sulfate (ch3o-so-och3) is also under pressure to be eliminated for reasons similar to phosgene. When the methyl carbon of DMC is attacked by nucleophiles, its alkyl oxygen bond will break. It also produces methylated products and uses acid methyl ester with DMC ratio, which has higher yield and simpler process. The main uses include synthetic organic intermediates, pharmaceutical products, pesticide products, etc;
Low toxic solvent
DMC has excellent solubility, narrow melting and boiling points, large surface tension, low viscosity and low dielectric constant. At the same time, it has higher evaporation temperature and faster evaporation speed, so it can be used as a low toxic solvent in the coating industry and pharmaceutical industry.
DMC is not only toxic, but also has high flash point, low vapor pressure and high lower explosion limit in the air. Therefore, DMC is a green solvent with both cleanness and safety.
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