Sodium Sulfite is an inorganic sodium salt of sulfurous acid with the chemical formula Na₂SO₃. It is typically supplied as a white crystalline powder or granulated solid and is readily soluble in water.

One of its important properties is its ability to act as a reducing agent and oxygen scavenger. In water-treatment applications, Sodium Sulfite can react with dissolved oxygen and is therefore used in selected systems to reduce oxygen-related corrosion, particularly in boiler feedwater and industrial water-treatment processes.

Sodium Sulfite is also used as a dechlorinating agent, where it can help remove residual chlorine from water when appropriately dosed. This makes it useful in selected water-treatment and industrial processes.

In the textile industry, Sodium Sulfite can be used in selected dyeing and processing operations as a reducing/processing chemical. In the paper and pulp industry, sulfite chemistry has applications in processing and bleaching-related operations, although the exact application depends on the manufacturing process.

Appropriately certified Food Grade Sodium Sulfite may also be used as a preservative/antioxidant or processing aid in permitted food applications. Food applications require compliance with applicable food regulations and maximum permitted levels.

Sodium Sulfite is available in different purity and grades, so the appropriate grade should always be selected according to the intended application.

Key Features

• Effective Reducing Agent
• Excellent Oxygen Scavenging Properties
• Useful Dechlorinating Agent
• Water Soluble
• Suitable for Water Treatment
• Useful in Textile Processing
• Suitable for Paper & Industrial Applications
• Available in Different Grades
• Easy to Handle and Formulate
• Versatile Industrial Chemical

Applications / Uses

1. Water Treatment

Sodium Sulfite is commonly used in selected water-treatment applications for:

• Dissolved Oxygen Removal
• Boiler Feedwater Treatment
• Dechlorination
• Industrial Water Treatment
• Oxygen-Corrosion Control

It can react with dissolved oxygen and help reduce corrosion risk in appropriately designed water systems.

2. Boiler Water Treatment

Sodium Sulfite is used as an oxygen scavenger in certain boiler-water treatment programs.

It helps remove dissolved oxygen that can contribute to corrosion of:

• Boilers
• Feedwater Lines
• Heat Exchangers
• Related Water Systems

The correct dosage depends on dissolved oxygen concentration, temperature, pressure, water chemistry, and treatment design.

3. Dechlorination

Sodium Sulfite can be used to neutralize residual chlorine in:

• Process Water
• Industrial Wastewater
• Water Treatment Systems
• Laboratory Water Treatment

Proper dosing is important because excess sulfite can remain in the treated water.

4. Textile Industry

Used in selected textile processes as:

• Reducing Agent
• Processing Aid
• Dyeing Auxiliary
• Chemical Treatment Agent

The application depends on the specific dye and textile-processing system.

5. Paper & Pulp Industry

Sodium sulfite may be used in selected:

• Pulp Processing
• Paper Manufacturing
• Chemical Treatment
• Reducing Processes

The exact application depends on the mill's process chemistry.

6. Food Industry

Food Grade Sodium Sulfite, where legally permitted, may be used as:

• Preservative
• Antioxidant
• Anti-browning Agent
• Processing Aid

Potential applications include selected:

• Dried Fruits
• Processed Foods
• Certain Beverage/Ingredient Systems
• Food Processing Applications

Only food-grade material meeting the applicable food regulations should be used in food products.

7. Chemical & Laboratory Applications

Used as a:

• Reducing Agent
• Oxygen Scavenger
• Dechlorinating Agent
• Chemical Processing Aid
• Laboratory Reagent

The appropriate analytical or laboratory grade should be used where high purity is required.