Sulphite lignin applications

Crude spent sulphite liquor in a concentrated form, or as a powder, is available as a product (Fig. 10.2), but purified forms of sulphite lignin have broader applications and higher value [8]. Such purified lignins are obtained by diverse techniques (sometimes involving the simultaneous recovery of co-products) such as ... 

Lignin, Industrial production. Sulphite pulping, Kraft pulping. Soda pulping, Lignosulphonates, Properties, Applications, Steam explosion, Organosolv technology... 

The introduction of lignins in urea-formaldehyde (UF) resins has also been extensively investigated [38] and successful industrial applications for particleboard have been operating with about 10 per cent of spent sulphite liquor in the UF formulation. Higher lignin contents have been applied to improve water resistance. In these resins, the lignin does not replace another reagent, as in the case of the PF counterparts, but simply intervenes as a third component, whose reactivity is lower, but whose interests lie in its low price and hydrophobic contribution to the final crosslinked material. 

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