Background and overview of the preparation method of ethyl propylene carbonate
Ethyl propylene carbonate can be used as a pharmaceutical synthesis intermediate. A new method for organic carbonates provides asymmetric organic carbonates or symmetric organic carbonates with good selectivity mainly through the specific selection and combination of starting alcohols and organic halogen compounds. The method involves carbonating alkali metals in the presence of a catalyst Salt, carbon dioxide gas, alcohol and organic halide react. Organic carbonates such as propylene ethyl carbonate are known to be used as plasticizers, additives, lubricants, solvents, etc. It is also known that organic carbonates having unsaturated bonds are used as raw materials for polymers, and polymers prepared from them are used as spectacle lenses, goggles.
Preparation method of propylene ethyl carbonate
Ethyl propylene carbonate is prepared as follows: Add 46g (1 mol) ethanol and 77g (1 mol) allyl chloride to a 500cc autoclave (made of JIS SUS136 stainless magnesium carbonate steel) equipped with a stirrer. , 3.2g triethylamine and metal carbonate. Blow the hydrated magnesium aluminate carbonate into the autoclave with carbon dioxide gas, and pressurize the reaction system to 10kg/cm2.G with carbon dioxide gas at room temperature while stirring at 1000 rpm. The temperature was increased to 120°C over the course of approximately 20 minutes. These raw materials were reacted at 120°C for 4 hours. The reaction product, propylene ethyl carbonate, was separated by filtration.
Preparation method and application of propylene ethyl carbonate
The application of ethyl propylene carbonate is as follows: prepare a lithium battery electrolyte, including organic solvents, additives, tris(trimethylsilane)borate, and lithium hexafluorophosphate. The additives include stabilizers, SEI film-forming additives, and resists. Flame agent, the mass ratio of the stabilizer, flame retardant, and SEI film-forming additive is 50?80:1?5:1?5; the stabilizer is compounded of organic fluorine compounds; the SEI composition The film additive is at least one of vinylene carbonate, vinyl sulfite, ethyl propylene carbonate, and butylene sulfite; the flame retardant is triphenyl phosphate and triethyl phosphate in a mass ratio of 1- 5:1-5 is compounded. The conductivity of the electrolyte of the lithium battery of the present invention is above 12ms/cm, close to 13ms/cm. The lithium battery used for production has excellent performance, the number of cycles is ≥700, and the internal resistance is ≤5.2mΩ. The first efficiency is ≥93%, the capacity is as high as 6510mAh, and the energy density is as high as 158.6Wh/K.
