Technical lignins are by-products of paper and pulp industry obtained by different pulping techniques such as soda, kraft and organosolv. Soda lignin (SL) has the main advantage of being sulfur-free, thus, having a similar structure of that of native lignin. Owing to its high purity and biocompability, SL has been used in different applications, including the production of dispersants, phenolic resins and animal food. Nonetheless, around 99% of SL that could actually become the source of many other value-added aromatic compounds is currently used as cheap fuel for burning. Simplified structure of soda lignin can be seen in Scheme 2, even though its real structure is much more complicated.