... : Wash oil is an important process of coal tar distillation fractions, one of about 6.5-10% coal tar ... naphthalene.As the separation and extraction biphenyl, methyl naphthalene, acenaphthene, fluorene, dibenzofurans and other products of raw materials, used to ... absorb benzene.In addition, for the preparation of anti-corrosion oil, production of quinoline, indole, dispersants, water reducing agent. ...