Characterization and Comparison of Some Kraft Lignins Isolated from Different Sources

Lignin characteristics are significantly affected by kraft processing and isolation conditions. In the studies carried out in this context, commercial lignins or isolated from industrial black solutions generally preferred. study, order to conduct more comprehensive research, three lignin samples were liquor obtained laboratory cooking trials of pine, poplar, wheat straw chips, representing softwoods, hardwoods, annual plants, respectively, according efficient pulping studies. addition, another lignin-containing waste was provided a pulp mill (OBL). The acidification method applied for isolating samples. After different sources, they characterized compared with commercially available sample (Indulin AT). Total phenolic groups, carboxyl purity, functional nitrobenzene oxidation products, molecular weight, thermal stability, element contents analyzed. (except straw) as pure lignin. Since agricultural an plant, inorganic elements such P, K, Si abundant than other However, polydispersity weight all higher those Because ash OBL, indulin AT between 1 3%, can be used high-value applications. particular, despite some disadvantages, has greater potential use extruders softwood due their syringyl content.