Low-ash lignin production technology

The inorganic content (also known as ash content), typically including metal ions, present in Kraft lignin hampers its use in higher-value applications. The production of carbon fiber (CF), carbon fiber reinforced polymers (CFRP), and anode materials require low ash content lignin as raw material. There is thus a great desire to reduce the ash content in kraft lignin significantly below the current level achieved by the industry (LignoBoostÒ and LignoForce™ technologies provide lignin with an ash content of 0.5-3%).

We have developed technology for low-ash content Kraft lignin production (0.01-0.03% ash content), which is environmentally friendly with reduced risk for hazards in the production process. The method could be integrated with already known Kraft lignin separation processes in a simple way.

Patent pending.