Cement industry, lignosulfonates

The use of the lignin fraction is much more cumbersome currently the best-known chemical of a real commercial importance is vanillin, which is obtained by oxidation of the black liquor. Another example is a product called spray-dried lignosulfonate (as sodium salt) obtained from the older, acidic sulfite pulping process. It is sold as a commercial product primarily as a concrete additive for enhanced strength. Since the cement industry is one of the big contributors of carbon dioxide emissions (due to the production of calcium oxide from calcium carbonate), the use of this renewable, wood-derived product not only is fossil-carbon neutral in itself but also reduces carbon dioxide emission due to the diminished need for cement in large infrastructures made of concrete. 

The biggest industrial user of lignosulfonates or sulfonated lignins is the cement industry, which uses these compounds as grinding aids, air entraining agents, concrete additives, and grout... 

Lignosulfonates 400-550 Evaporation, precipitation, ultrafiltration, electrodialysis, ion exclusion Additive (oil well drilling muds, Portland cement concrete), dispersing agent and binder (textiles, products of printing industry, mineral slurries), raw material (vanillin, dimethyl sulfoxide, etc.)... 

Marasperse. [Borregaard LignoTech] Lignosulfonates or oxylignins dispersant emulsion stabilizer for ceramic slurries, stucco, agrk. formulations, dyestuffs, gypsum board, industrial cleaners, cement slurries, paper m., in mfg. of brick, tile, refractmies. 

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