Introduction

Sodium Sulfide is a powerful inorganic compound known for its reducing and desulfurizing capabilities. This yellow crystalline solid emits a strong hydrogen sulfide odor and plays a vital role in numerous industrial processes. From leather production to wastewater treatment, sodium sulfide is valued for its efficiency, reactivity, and cost-effectiveness, making it a high-demand chemical in global supply chains.

What is Sodium Sulfide?

Sodium Sulfide (Na₂S) is an industrial chemical available in both anhydrous and hydrated forms. It appears as yellow to red flakes or crystals and is highly soluble in water, forming an alkaline solution. When exposed to moisture, sodium sulfide releases hydrogen sulfide gas (H₂S), which gives it its characteristic pungent smell. This compound serves as a strong reducing agent and is essential in several purification and manufacturing processes.

Chemical and Physical Properties of Sodium Sulfide

• Chemical formula: Na₂S

• Molar mass: 78.04 g/mol

• Appearance: Yellow to reddish flakes or crystals (color varies due to polysulfide impurities)

• Solubility: Easily dissolves in water, forming a strongly alkaline solution

• Melting point: Approx. 1,176°C

• Reactivity: Reacts readily with acids and oxidizing agents

• Odor: Sharp smell of hydrogen sulfide due to decomposition upon moisture exposure

Because Na₂S can oxidize in air and release toxic gases, it must be stored and handled with care.

Grades and Forms of Sodium Sulfide

Depending on the application, Na₂S is available in multiple forms and concentrations:

• Sodium Sulfide 60% Flakes – Widely used in mining and leather processing

• Sodium Sulfide 70% – Higher purity for sensitive chemical and industrial applications

• Liquid Na₂S – Suitable for automated or closed system dosing

Choosing the correct grade is critical for achieving desired results in specific processes

Production Process

Na₂S is typically produced by reacting sodium carbonate (soda ash) with sulfur or hydrogen sulfide under controlled conditions. Another method involves the direct reduction of sodium sulfate using carbon at high temperatures. The final product is purified, cooled, and flaked or dissolved based on its end use.

Applications and Uses of Sodium Sulfide

Na₂S is widely used across various industries for its unique chemical behavior. Here are its most important applications:

1. Pulp and Paper Industry

In the Kraft process, sodium sulfide breaks down lignin in wood, separating cellulose fibers for high-quality paper production. It ensures efficient pulping and improves yield in packaging, tissue, and printing paper manufacturing.

2. Water Treatment

Na₂S is used to precipitate heavy metals from wastewater by converting them into insoluble sulfides. It also serves as an oxygen scavenger, minimizing corrosion in industrial pipelines and water systems.

3. Textile Industry

In textile processing, sodium sulfide acts as a degumming and desulfurizing agent. It neutralizes chlorine from bleaching agents and removes impurities, improving fabric quality and process sustainability.

4. Leather Industry

In tanning, Na₂S is used to remove hair from animal hides and soften the leather. This chemical action is crucial in producing smooth, high-grade leather used in apparel, upholstery, and accessories.

5. Chemical Manufacturing

Na₂S is essential in manufacturing sulfur-based dyes and rubber accelerators. It enhances the elasticity of rubber products and contributes to producing long-lasting, colorfast dyes for textiles.

Packaging and Storage

• Sodium Sulfide is commonly packed in:
  • 25 kg and 50 kg plastic-lined woven bags
  • 1000 kg jumbo bags
  • For liquid form: IBC tanks or drums

  It must be stored in a dry, well-ventilated area, away from moisture and acids. Containers should be sealed tightly to prevent degradation and gas emission.

Safety Considerations

• Personal Protection: Use gloves, goggles, and a suitable respirator
• Ventilation: Ensure adequate airflow to prevent H₂S accumulation
• Spill Management: Contain spills with absorbent materials; dispose of according to local regulations
• First Aid: In case of contact, rinse affected areas with water for at least 15 minutes and seek medical attention

Due to its reactive nature, Na₂S must be handled using proper safety measures:

Why Choose Sodium Sulfide?

Na₂S offers unmatched versatility, efficiency, and cost-effectiveness in industrial applications. Its reducing capabilities and multifunctional nature make it indispensable in sectors such as pulp and paper, wastewater treatment, textiles, and chemicals.

For consistent quality and tailored supply, trust ZÜMRÜT International Kimya Co., a leading global supplier of high-purity sodium sulfide for diverse industrial applications. Contact Us Today

TECHNICAL DATASHEET

SPECIFICATIONS	RESULTS
Appearance	Yellow Flakes
Na2S, %	60 ± 2
Na2SO3, %	< 2
Na2CO3, %	< 0.5
Fe, ppm	< 10
Insoluble Content, %	< 12
Density, g/ cmᵌ	1600
Melting Point, ℃	92

 

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