Diphenyl ether is mainly used for mixing with biphenyl to form a low melting point. Due to the large temperature range of the liquid state of the mixture, it is suitable for use as a heat transfer medium;Diphenyl ether is the starting material for the production of thiophene through the Ferrari reaction, which is used in the production of polyamides and polyimides;Raw materials for producing decabromodiphenyl ether;Diphenyl ether has the aroma of fragrant leaves and crabapple, as well as the notes of sweet orange and narcissus. In the spice industry, it is called crystalline fragrant leaf oil or artificial fragrant leaf oil. Because diphenyl ether is relatively stable to alkalinity, it is mostly used to prepare soap essence, and it is also commonly used as a substitute for scented leaf oil, which is suitable for preparing floral cosmetics, deodorants, etc;This product is used as an organic synthesis intermediate in the spice industry, synthetic resins, and other organic synthesis production.