Sodium lignosulphonate

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  • Sodium lignosulfonate (lignosulfonic acid, sodium salt) is used in the food industry as a de-foaming agent for paper production and in adhesives for items that come in contact with food.
  • It has antimicrobial and preservative properties, and is used as an ingredient in animal feeds.
  • It is also used for construction, ceramics, mineral powder, chemical industry, textile industry (leather), metallurgical industry, petroleum industry, fire- retardant materials, rubber vulcanization, organic polymerization.
  • Sodium lignosulfonate (NaLS) is obtained from renewable sources and was chosen as a substitute for phenol in the preparation of phenolic resins in view of its chemical structure, which features aromatic rings of the phenolic type.
  • Sodium lignosulfonate was prepared from stripped sulphite waste liquor obtained from the Rhinelander Paper Company, Rhinelander, Wisconsin. Twelve L of this liquor were filtered and then saturated with sodium chloride.
  • Metal salts of lignosulfonic acid (LS), such as sodium (Na), calcium (Ca) and magnesium (Mg) are produced from an eluted solution obtained as a by-product of cooking process in sulfite pulping.
  • The sulfonic group is usually introduced into -position of the phenylpropane structure of lignin via cleavage of the side chain.
  • The corrosion and scale inhibition properties of sodium lignosulfonate (SL) were investigated by determining the corrosion and scale inhibition efficiency, the polarization curve, the residual turbidity, and the polymorph of calcium carbonate (CaCO3) scale.
  • The pH value of 10 wt % SL solution is about pH 6, and the percentage of SL was determined by ultraviolet spectrophotometry.
  • Sodium lignosulfonate was used as a substitute for phenol in the preparation of phenolic resin, as it contains aromatic rings of phenolic type, and as a substitute for polyols in the preparation of polyurethane, due to the presence of alcoholic hydroxyls which can react with the isocyanate group.

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