Method for separating and recycling naphthalene residual oil

The invention discloses a method for separating and recycling naphthalene residual oil. The method sequentially includes steps of feeding a raw material which is the naphthalene residual oil; removinglight components, to be more specific, separating the light components in the naphthalene residual oil and delivering tower bottom discharged materials to naphthalene removal towers; removing naphthalene, to be more specific, condensing tower top gas phase by the aid of condensers, then delivering a part to tower tops to be used as reflux, delivering another part to naphthalene refining sectionsand delivering tower bottom discharged materials to benzothiophene towers; removing benzothiophene, to be more specific, condensing tower top gas phase by the aid of condensers, then feeding condensedfluid into condensed fluid tanks, delivering a part to tower tops to be used as reflux, delivering another part into static crystallizers, delivering tower bottom discharged materials to byproduct storage tanks and returning m