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Sodium Lignosulfonate from Sulfite Pulp
The sulfite process is also used by the paper and pulp industry for producing lignosulfonates. The pulping solution employs salts of sulfurous acid, either salts of sulfites (SO32 −), or bisulfites (HSO32 −). The common counterions are single-valent sodium (Na+), potassium (K+), and ammonium (NH4+), and doubly-valent calcium (Ca2 +) and magnesium (Mg2 +). The sulfite process can be carried out in a wide range of…
