Result background:

Diethyl acetate carbonate and ethyl methyl carbonate are new types of environmentally friendly solvents and additives with excellent performance. Widely used in organic synthesis, methyl (ethyl) ylating agent, carbonyl methyl (ethyl) oxygenating agent, used as a solvent for nitrocellulose, cellulose ethers, synthetic resins and natural resins, and synthesized pesticides pyrethroids and pharmaceutical phenobarbital; used to make fixing paints in the instrumentation industry and to seal and fix the cathode of electronic tubes. In textile printing and dyeing, it is a good solvent for polyamide, polyacrylonitrile, bisphenol resin, etc. It can be used as a swelling agent in the synthetic fiber industry to improve fiber properties, improve fabric feel, and improve anti-wrinkle properties. In terms of printing and dyeing, diethyl carbonate can enhance the printing and dyeing properties of hydrophobic synthetic fibers, make dyeing distribution even, and improve sun fading properties. Used as a stripping solvent in the paint industry. Used as a solvent for plasticizers in plastic processing or directly as plasticizers. Used as an electrolyte in the capacitor battery and lithium battery industries. In medicine, it is used as the basic ingredient of cortisone ointment.

Technical advantages:

This research group has developed the world's first multi-coupling process enhancement technology, saving energy by more than 45%. It has passed the appraisal of the Shanghai City Science and Technology Commission and has reached the international advanced level. The annual output is 10,000 tons: 7000 tons of ethyl methyl carbonate, 3000 tons of diethyl carbonate, and the equipment investment is about 20 million yuan.

Diphenyl carbonate is a basic raw material for the production of polycarbonates such as engineering plastics, optical glass and optical disc resins. It is also widely used in the preparation of plasticizers, solvents and medicinal organic carbonates. It was first made from phosgene and phenol. It is prepared by reacting it in the presence of alkali.

Because the process uses highly toxic phosgene as raw material, the process is complex, equipment corrosion is serious, and the by-products are quite large and difficult to handle.

NaCl, in addition, the existence of a large amount of chloride greatly affects the purity and performance of the product, and cannot be used as optical glass and optical disc resin. This technology uses dimethyl carbonate as a raw material instead of highly toxic phosgene, making the entire process clean and safe, and the final product does not contain impurity chlorine and has high purity, and can be used in the preparation of optical discs and optical grade polycarbonate.

Application prospects:

With the development of capacitor battery and lithium battery industries and strict control of environmental protection requirements for solvents, diethyl carbonate and ethyl methyl carbonate have broad application prospects. In recent years, my country's annual imports of polycarbonate have exceeded 1 million tons, and the market prospects of diphenyl carbonate as its raw material are very broad.