Lignin is a natural aromatically polymer which is part of plant cell walls. The content of lignin in the plant varies due to the plant resource.
For the lignin extraction a mixture of an organic solvent and water is used. The amount of lignin extracted from the plant is depending on the combination of extraction liquor composition and pH, extraction temperature and time. 
The precipitation of the lignin nanoparticles can be produced in the precipitation step directly from extraction solution just after the filtration to remove substrate particles.
The received lignin nanoparticles are in the range of several 100 nanometers and can be influenced by the extraction and the precipitation parameters.
Additionally, valuable products can be produced from the cellulose and the hemicellulose fraction of the plant.