Biphenyl is an important organic raw material, it is widely used in medicine, pesticides, dyes and liquid crystal materials. Biphenyl can be used to synthesize plasticizers, preservatives, also can be used to make fuel, engineering plastics and high-energy fuel. Biphenyl present in coal tar, crude oil and natural gas. Biphenyl by preparation methods such as benzene pyrolysis of biphenyl through chemical synthesis and separation of coal tar distillate extraction system of biphenyl. Biphenyl in the mass fraction of coal tar 0.20% -0.40%, the current coal tar extraction and chemical synthesis co-exist.Biphenyl is colorless or light yellow, flaky crystals, slightly sweet odor.Another major use of biphenyl is uesd as lead agentin the printing industry , also used as the impregnating agent orange wrapping paper.
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