- 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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