93%-97% Sodium lignosulfonate CAS 8061-51-6

What is sodium lignosulfonate? What are its industrial applications?

1. What is Sodium lignosulfonate?

Sodium lignosulfonate, also known as sodium lignin sulfonate (or sodium Sodium lignosulfonate (also called sodium lignin sulfonate, or sodium lignin sulfonate, sulfonated lignin sodium salt, also known as lignin sodium) is a natural anionic surfactant with high molecular weight, extracted and purified from sulfite pulping wastewater. It is also one of the most commonly used lignin derivatives in the industrial field. The composition can be reduced to:

Sodium lignosulfonate (CAS No.: 8061-51-6, a natural high molecular weight polymer with no fixed molecular formula).

It is a brownish-brown powder at room temperature (it also exists in liquid form), easily soluble in water, and has various properties such as dispersion, water reduction, binding and chelation. Sodium lignosulfonate is a typical anionic polymeric surfactant composed of a lipophilic lignin skeleton and a hydrophilic sulfonic acid group (-SO3Na). It can disperse and suspend solid particles in water and can chelate polyvalent metal ions such as calcium, magnesium.

Sodium lignosulfonate is the result of comprehensive utilization of sulfite pulping waste liquor of papermaking industry from the source. It converts the “black liquor”, an environmental burden at the start, into a green chemical with economic value. It is a typical renewable biomass resource chemical product, in line with the concepts of green environmental protection and circular economy.

Chemically, sodium lignosulfonate is a natural high molecular weight surfactant. It is chemically stable, acid and alkali resistant, biodegradable and low toxicity. It requires a small dosage and is highly effective as a dispersant and its price is more advantageous than petroleum-based dispersants. It should be kept in an airtight, moisture-proof container.

Industrial-grade sodium lignosulfonate is a product (technical grade) that is used in industrial applications such as concrete, drilling, coal-water slurry, and ceramics and is commonly available in powder or liquid form. Industrial-grade products are more targeted to the following indicators than Feed-grade and Pesticide-grade products:

1. reducing sugar content

Reducing sugars reflect sugar impurities in pulping waste liquor, affecting product performance (such as water reduction rate in concrete), and must be controlled within a reasonable range.

2. Water-insoluble matter

Water-insoluble matter reflects the total amount of impurities, affecting solubility and application performance. Industrial grade generally requires less than 0.3% and must be strictly controlled.

3. Moisture

Moisture content affects product storage stability and the accuracy of ingredient addition; moisture content must be strictly controlled for powder products.

4. pH value

pH value affects the properties of the product and the compatibility of the formulation. It must be controlled within the indicated range to ensure compatibility with concrete, slurry and other systems.

5. Ash and sulfate

Ash and sulfate content reflect the content of inorganic impurities, affecting product purity and application performance, and must be controlled within a reasonable range.

6. Viscosity (liquid type)

The viscosity of liquid products affects their use and transportation; batch stability must be maintained.

What are the uses of industrial-grade Sodium lignosulfonate?

Industrial-grade sodium lignosulfonate, with its unique combination of dispersing, water-reducing, binding, and chelating properties, is widely used in the construction, energy, ceramics, and environmental protection fields.

1.Concrete water-reducing agent (core application)

Sodium lignosulfonate is a conventional concrete water reducing agent and plasticizer (usually dosed at 0.2%-0.5% of the cement dosage). It helps to improve concrete workability, reduce water consumption and increase strength. It is widely used in cost-sensitive projects and is the largest downstream product of lignin in terms of output due to its price advantage.

2. Drilling mud diluents and dispersants

Purified lignin sulfonates are used as oil drilling mud diluents, dispersants and viscosity reducers. They are an important additive to oil and gas drilling industry as they help to control rheological properties of the mud, stabilize the wellbore and prevent mud flocculation.

3. Coal-water slurry additives

Sodium lignosulfonate is a dispersant and stabilizer for coal-water slurry, allowing the coal powder to be evenly dispersed in water, reducing viscosity, improving slurry concentration and stability, and serving the coal chemical industry and clean energy industry.

4.Water-reducing agents for ceramics and refractory materials

Sodium lignosulfonate is used in ceramic blanks, glazes and refractory materials as a water-reducing and dispersing agent to reduce molding moisture, improve the strength and density of the blank and serve the building ceramics and refractory materials industries .

5.Additives for Resins and Rubbers

The sodium lignosulfonate is used as a modifier for resins such as phenolic resins and as a rubber processing aid to help improve processing performance and product properties. It can also be used as an adhesive component for the polymer materials industry.

6.Asphalt emulsifier

Sodium lignosulfonate is an emulsifying stabilizer for emulsified asphalt, which makes asphalt form a stable emulsion in water, and is used in road construction and waterproofing materials industries.

7. Flotation Reagent for Ore

Sodium lignosulfonate is an auxiliary reagent in mineral flotation to contribute to improve flotation separation results and serve the mining and mineral process industry.

8. Additives for water treatment and industrial cleaning

Uses of Sodium Lignosulfonate Sodium lignosulfonate is used as a component of industrial cleaning agents, a scale inhibitor and dispersant in circulating water treatment. It is useful in chelating calcium and magnesium ions, dispersing scale and suspended solids. It can also be used as a chelating agent for heavy metals.

9. Other applications

With the development of green chemicals, the application scope of industrial-grade sodium lignosulfonate is continuously expanded, such as in carbon black and pigment dispersion, soil improvement and dust control and curing .

Summary

Sodium lignosulfonate (CAS No. 8061-51-6) is a natural anionic surface active agent with high molecular weight which is obtained and purified from the waste water of sulfite pulping. It is a brownish red powder, and easily soluble in water. Its unique properties of dispersing, water reducing, binding and chelating make it one of the most widely used lignin derivatives and green chemicals. In our daily life, we come across it on the concrete construction, ceramic sanitary ware, the road asphalt, the petroleum energy and the industrial products. Sodium lignosulfonate is widely used in industry as a water-reducing agent for concrete, a diluent for drilling mud, an additive for coal-water slurry, a water-reducing agent for ceramic refractories, an additive for resin rubber, an emulsifier for asphalt, an agent for ore flotation and an aid to industrial cleaning and water treatment. It is an environmentally-friendly, multi-purpose chemical that links “natural high-molecular-weight surfactant chemistry” with “construction, energy, ceramics and environmental protection.”