Depolymerized lignin in hydrocarbon oil

The present invention relates to a method of preparing a composition comprising lignin derivative and a solvent; wherein the lignin derivative has a weight average molecular weight (M) of 250g/mol to 650g/mol， wherein the method comprises treating black or red liquor in a sealed container at 360-420°C.本发明涉及一种包含木质素衍生物与溶剂的组合物的制备方法；其中所述木质素衍生物的重均分子量（weight average molecular weight，记为M）为250g/mol至650g/mol，该方法包括在密闭容器中于360-420℃下处理黑液或红液。