... .Best Service Definition: Wash oil is an important process of coal tar distillation fractions, one of about 6.5-10% coal ... tar is a complex mixture, rich in quinoline, isoquinoline, indole, α-Anaphthalene ... , methyl naphthalene, acenaphthene, fluorene, dibenzofurans and other products of raw materials, used to absorb benzene.In addition, for ...