Depolymerized lignin products are very complex mixtures. In this paper,based on depolymerization solution of commercially available sodium lignosulfonate under mild conditions,an efficient method for separation and analysis of depolymerized lignin products and evaluation of the yields of reaction products has been developed. The GPC result indicated that lignosulfonate was almost completely converted into small molecules,which mainly dispersed in three oligomer ranges. 9 of depolymerized aromatics products ...