Biphenyl is found in coal tar, crude oil and natural gas. The preparation methods of biphenyl include the chemical composition method of making biphenyl through benzene pyrolysis and the separate extraction method of making biphenyl through various coal tar fractions. The mass fraction of biphenyl in coal tar is 0.20%-0.40%, and coal tar extraction method and chemical composition method coexist.

Properties: White or slightly yellow scaly crystals with unique fragrance.

Solubility: Insoluble in water, acid and alkali, but soluble in organic solvents such as alcohol, ether and benzene.

It can be used to form plasticizers, preservatives, and can also be used to make fuels, engineering plastics, and high-energy fuels.