Commonly used organic solvents include dimethyl carbonate (DMC), diethyl carbonate (DEC), ethyl methyl carbonate (EMC), propylene carbonate (PC), dimethyl sulfoxide (DMSO), diethyl ether (DME), tetrahydrofuran (THF), etc. Among them, DMC, DEC and EMC are currently the most commonly used ternary mixed solvents, which have the advantages of low viscosity, low cost and high flash point, but also have disadvantages such as high volatility, flammability and explosiveness, unfriendliness to the environment.