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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+),…

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sodium lignosulfonate as dispersant of coal water slurry

In order to use lignosulfonates (a by-product of pulp and paper processes) as an effective dispersant of coal water slurry five purified sodium lignosulfonate (SL) samples with different molecular weights were prepared by fractionation using…

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Molacular Weight Decide Lignosulfonate Dispensing Capability

The three purified Sodium lignosufonate fractions with different molecularweights were obtained using ultrafiltration. With theincrease in molecular weight, the content of phenolichydroxyl group, sulfonic acid group, and carboxyl groupdecreases, the purity of Sodium lignosulfonate increases,…

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Effect of SL on Dyestuff Reduction and Dyeing Properties

The content of catechol of Sodium lignosulfonate with different molecularweights is different based on the different content of hydrophilic functional groups, which would affect the reductionof SL on dyestuff caused by the oxidative processes ofcatechol…

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Effect of Sodium lignosulfonate on Fiber Staining

Both the adsorption of SL on the fiber surface and thedark brown color of SL would cause fiber staining, whichtends to distort the authentic color of dye on the fabric.[23]The degree of fiber staining would…

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Molecular Weight of Sodium lignosulfonate Related with Dye Dispersant

Although lignosulfonate has been widely used as dye dispersant, it has some disadvantages. On the one hand, thecolorless catecholic structure in lignin is easy to oxidize toquinonoid structure in lignin isolation procedures and pulping processes,…

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Lignin and sulfonated lignin

Lignin is the largest reservoir of aromatic compounds on earth and has great potential to be used in many industrial applications. Alternative methods to produce lignosulfonates from spent sulfite pulping liquors and kraft lignin from…