- Pulverization: The lignin-rich plant material is first pulverized to increase its surface area and make it easier to extract lignin.
- Extraction: The pulverized plant material is subjected to a chemical extraction process. Typically, a mixture of water and a strong alkaline solution, such as sodium hydroxide (NaOH), is used as the extracting agent. The alkaline solution helps break down the plant fibers and solubilize lignin.
- Filtration: The extracted solution is then filtered to separate the insoluble plant residues from the lignin-containing solution.
- Acidification: The lignin-containing solution obtained from the filtration step is acidified to precipitate lignin in the form of lignosulfonate salts. Sulfuric acid (H2SO4) or another suitable acid is added to lower the pH of the solution. This acidification step converts the lignin into water-soluble lignosulfonates.
- Filtration and Washing: The precipitated lignosulfonate salts are filter.
Sodium lignosulfonate manufacturing process
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