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Introduction of Dimethyl carbonate
Dimethyl carbonate (DMC) is one of the five carbonate solvents, an important organic reaction intermediate and a low-toxic and environmentally friendly chemical raw material. The carbonyl, methoxy, methyl and other groups contained in its molecular structure can replace phosgene or dimethyl sulfate as carbonylating agent or methylating agent, and are widely used in carbonylation and methylation reactions.

1、 Lithium battery electrolyte
The negative electrode of lithium battery is relatively active and unstable in the aqueous system. Non-aqueous and aprotic solvents must be used as the carrier of lithium ions. The solvents used in lithium ion batteries mainly include cyclic carbonates, chain carbonates, and carboxylate. class, ether organic solvent, etc. 80% of the lithium battery electrolyte quality is carbonate solvents, mainly: dimethyl carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, ethylene carbonate, of which dimethyl carbonate is in five carbonic acid esters. Esters account for about 23%.

2、 Adhesive
In the production of adhesives, DMC is mainly used for solvent-based adhesives, especially polyurethane adhesives. Polyurethane adhesives are widely used in shoemaking, construction, highways, runway caulking materials, and high-rise building glass sealing materials.

3、 Coatings and resins
DMC has excellent application performance in coatings. It is miscible with almost any organic solvent, and can dissolve most of the resins commonly used in coatings alone or together with other solvents.
As a low toxicity solvent, the application test of dimethyl carbonate in thermal acrylic paint, nitro resin varnish, alkyd resin varnish and polyurethane varnish shows that dimethyl carbonate can be used as a component of mixed solvent to replace the original formula Part of toluene, xylene, ethyl acetate and other organic solvents in it will not affect the performance of the coating.

4、 Pharmaceuticals
The pharmaceutical industry is currently an important consumption area of DMC in my country. DMC is mainly used as a methylating agent to replace the highly toxic dimethyl sulfate in medicine, and is used to synthesize anti-infective drugs, antipyretic and analgesic drugs, vitamin drugs and other drugs. Central nervous system medication. At present, the dosage of ciprofloxacin is about 5,000 tons, the dosage of ofloxacin is about 1,000 tons, the dosage of furazolidone is about 1,000 tons, as well as carbamazepine, carboxy, carbade, and furatarone. With the further reduction of the cost and price of dimethyl carbonate and the further strengthening of domestic environmental protection policies, the application of dimethyl carbonate in the pharmaceutical industry to replace highly toxic dimethyl sulfate as a methylating agent will also be widely used promotion.

5、 Pesticides
At present, the market consumption of DMC in my country's pesticide industry is relatively small, and about 8,000 tons of DMC have been industrially applied, including sulfentrazone, metsulfuron, carbaryl, and carbofuran. Since my country is a big country in the production of pesticides, with the acceleration of the adjustment of my country's pesticide industry structure, the country's requirements for pesticide safety will become increasingly strict, and traditional highly toxic pesticides will be gradually replaced by non-toxic and low-toxic pesticide products. Therefore, as a The application of DMC products of green environmental protection intermediates in the field of pesticide production will have broad prospects for development.

6、 Gasoline additives
As a new gasoline additive, dimethyl carbonate is a substitute for methyl tert-butyl ether (MTBE), which can effectively improve the octane number and oxygen content of gas oil, and has a good application prospect.

7、 Developer
Tetramethyl alcoholamine (TMAH) is mainly used as developer in photographic printing. Dimethyl carbonate DMC is the main raw material for the production of TMAH (tetramethyl ammonium hydroxide) developer. Among all the raw materials, Glinda purchases DMC The amount of DMC is the largest, and the number of DMC purchases is increasing year by year.
In the past, it was produced with methyl chloride as raw material, and the product contained trace chlorides. Using DMC to replace methyl chloride, DMC reacts with trimethylamine to generate tetramethylamino carbonate, which is then hydrolyzed into tetramethylamino hydrogen carbonate, and finally electrolyzed to obtain high-purity TMAH.
The semiconductor field has very high requirements on the quality of the developer, so it is necessary to use raw materials of better quality. In order to better meet the strict requirements of the developer quality in the semiconductor field, it is best to use ultra-pure DMC in the production of semiconductor developer. Because ultra-pure DMC contains less impurities, the purity is higher.

8、 Polycarbonate (PC)
In the non-phosgene process, dimethyl carbonate is transesterified with phenol to generate diphenyl carbonate, and then diphenyl carbonate reacts with bisphenol A in a molten state to polycondensate to generate polycarbonate. The environmentally friendly dimethyl carbonate is used instead of phosgene to produce diphenyl carbonate, and then diphenyl carbonate is transesterified with bisphenol A to produce polycarbonate. This non-phosgene melting process has no by-products, and avoids the use of highly toxic chemical phosgene in the production process, which can truly reduce pollution from the source and achieve clean production of polycarbonate.