LignoBoost process

LignoBoost works in conjunction with evaporation. The two-step process results in a very pure lignin with low ash content.

Black liquor is taken from the evaporation plant and the pH is lowered with CO2. The precipitated lignin is dewatered with a filter press. LignoBoost then overcomes conventional filtering and sodium separation problems by redissolving the lignin in spent wash water and acid. The resulting slurry is once again dewatered and washed, with acidified wash water, to produce virtually pure lignin cakes. The lignin lean liquor is returned to the liquor cycle.

LignoBoost process

Stora Enso Sunila Mill - LignoBoost plant for high quality kraft lignin production

Stora Enso’s Sunila Mill produces kraft lignin with Valmet’s LignoBoost™ technology.

LignoBoost plant at Domtar's Plymouth mill in North Carolina

Domtar's LignoBoost plant at Plymouth, North Carolina, USA is integrated with the pulp mill and separates and collects lignin from the pulping liquor. This provides the Plymouth NC mill with numerous benefits. Lignin is a high-quality bio-based alternative to fossil fuel based materials. Separation of a portion of the mill's total lignin production also off-loads the recovery boiler, and allows an increase in pulp production capacity.