Sodium Dithionite, Sodium Hydrosulfite, Disodium Hydrosulfite, Disodium Dithionite, Sodium Hyposulfite, Vatrolite, Natrium Dithionit, 7775-14-6

Sodium Dithionite, Sodium Hydrosulfite, Disodium Hydrosulfite, Disodium Dithionite, Sodium Hyposulfite, Vatrolite, Natrium Dithionit, 7775-14-6

SODIUM DITHIONITE (SODIUM HYDROSULFITE)

PRODUCT IDENTIFICATION INFORMATION

CHEMICAL STRUCTURE

Sodium Dithionite Structure:

        O           O
        ||          ||
    Na⁺—O—S—S—O—Na⁺
        ||          ||
        O           O

Structure Description:

• Inorganic salt containing two sodium ions and a dithionite anion (S₂O₄²⁻).

• Strong reducing agent.

• White to pale yellow crystalline solid.

• Highly soluble in water.

• Unstable in air and moisture; decomposes with heat generation.

• Has a characteristic sulfur dioxide-like odor.

SECTION 1: CHEMICAL IDENTITY AND DESCRIPTION

SECTION 2: PHYSICAL AND CHEMICAL PROPERTIES

SECTION 3: SODIUM DITHIONITE vs OTHER REDUCING AGENTS

SECTION 4: MECHANISM OF ACTION

SECTION 5: PRODUCTION PROCESS

Industrial Production Methods:

Method 1: Reaction of Sodium Formate with Sulfur Dioxide

Process Flow:
Sodium Formate + Sulfur Dioxide + Zinc Dust / Sodium Hydroxide → Sodium Dithionite → Filtration → Crystallization → Drying → Final Product

Description: Sodium formate is reacted with sulfur dioxide in the presence of a reducing agent (zinc dust or sodium hydroxide) to produce sodium dithionite. The product is filtered, crystallized, and dried to obtain the final product.

Method 2: Reduction of Sodium Bisulfite

Process Flow:
Sodium Bisulfite + Sodium Borohydride / Zinc Dust → Sodium Dithionite → Filtration → Crystallization → Drying → Final Product

Description: Sodium bisulfite is reduced with a strong reducing agent (sodium borohydride or zinc dust) to produce sodium dithionite. The product is purified and dried.

Method 3: Electrolytic Process

Process Flow:
Sodium Sulfite Solution → Electrolysis → Sodium Dithionite → Crystallization → Drying → Final Product

Description: Sodium sulfite is electrolyzed to produce sodium dithionite. This method is less common but used in some processes.

SECTION 6: FUNCTIONAL PROPERTIES

SECTION 7: MAIN APPLICATION AREAS

SECTION 8: SAMPLE FORMULATIONS

Textile Dyeing (Indigo Reduction):

Instructions: Dissolve sodium hydroxide and sodium dithionite in water; Add indigo dye and reduce to leuco form; Immerse fabric and dye; Oxidize after dyeing to regenerate insoluble indigo.

Cement Chromium Reduction Additive:

Instructions: Add sodium dithionite to cement during grinding; Ensures uniform distribution; Reduces Cr(VI) to Cr(III); Monitor final Cr(VI) content (≤ 2 ppm).

SECTION 9: QUALITY SPECIFICATIONS

SECTION 10: TOXICOLOGICAL PROFILE

SECTION 11: GHS CLASSIFICATION AND LABELING

GHS Classification (in accordance with CLP and UN GHS):

Signal Word: DANGER

Hazard Pictograms: GHS02 (Flame), GHS07 (Exclamation Mark)

Hazard Statements (H-Codes):

NFPA 704 Hazard Classification:

SECTION 12: PRECAUTIONARY STATEMENTS (P-CODES)

SECTION 13: FIRST AID MEASURES

SECTION 14: FIREFIGHTING MEASURES

SECTION 15: STORAGE AND SHELF LIFE

SECTION 16: PACKAGING OPTIONS

SECTION 17: TRANSPORT INFORMATION

SECTION 18: REGULATORY STATUS

SECTION 19: OTHER NAMES AND SYNONYMS

SECTION 20: SUMMARY TABLE

SECTION 21: CRITICAL WARNINGS AND BEST PRACTICES

CRITICAL WARNINGS:

• FLAMMABLE SOLID (H228): Flammable solid; Self-heating; may catch fire (H251). KEEP AWAY FROM HEAT AND IGNITION SOURCES.

• SELF-HEATING (H251): May self-heat and catch fire; Keep cool and dry; Monitor for temperature rise.

• HARMFUL IF SWALLOWED (H302): Avoid ingestion; Use appropriate safety measures.

• CAUSES SKIN AND EYE IRRITATION (H315, H319): Personal protective equipment is mandatory.

• MAY CAUSE RESPIRATORY IRRITATION (H335): Avoid inhalation of dust; Use in well-ventilated areas.

• REACTS WITH AIR AND MOISTURE: Decomposes with heat generation; Can ignite combustible materials; Store in tightly closed containers.

• REACTS WITH ACIDS AND OXIDIZERS: Violent reaction; Fire and explosion hazard; DO NOT MIX WITH ACIDS OR OXIDIZERS.

• RELEASES SO₂: Decomposes with sulfur dioxide (SO₂) release; Toxic gas; Use respiratory protection.

• SHORT SHELF LIFE: Unstable; Use within 6-12 months; Regular inspection recommended.

• ENVIRONMENTAL HAZARD: Harmful to aquatic life at high concentrations; Avoid release to environment.

BEST PRACTICE RECOMMENDATIONS:

• Textile Industry: Use as vat dye reducer and bleaching agent; Indigo dyeing for denim; Dosage: 1-3 g/L; Use under alkaline conditions; Combine with sodium hydroxide; Use in dyeing processes.

• Paper Industry: Use as bleaching agent; Recycled paper pulp bleaching; Dosage: 0.2-1.0% on dry pulp weight; Kaolin clay brightening.

• Cement Industry: Use as chromium reducer; Reduces Cr(VI) to Cr(III); Dosage: 0.1-0.3% of cement weight; Ensures worker safety; Environmental compliance.

• Water Treatment: Use as oxygen scavenger; Boiler water treatment; Dosage: Low ppm levels; Dependent on water chemistry; Prevents corrosion.

• Handling: Use in well-ventilated areas; Avoid dust formation; Use dust masks (N95/FFP2) when handling powder; Use gloves and safety goggles; Avoid contact with eyes and skin; Keep away from moisture and heat.

• Personal Protective Equipment: MANDATORY: Fire-retardant clothing, chemical-resistant gloves, safety goggles or face shield, protective clothing, dust mask (N95/FFP2 or higher), self-contained breathing apparatus (SCBA) for high concentrations.

• Hygiene: Wash hands thoroughly after handling; Do not eat, drink, or smoke while using; Remove contaminated clothing and wash before reuse.

• Storage: Store in tightly closed, moisture-proof containers; Store in cool, dry, well-ventilated area; Protect from moisture and heat; Keep away from combustible materials; Opened containers must be resealed immediately; Shelf life: 6-12 months under proper conditions; Regular temperature monitoring recommended.

• Spill Management: Evacuate area; Eliminate ignition sources; Sweep or vacuum (HEPA) with spark-proof equipment; Place in suitable sealed container; Avoid dust formation; Do not allow entry into drains or waterways; Keep away from moisture.

• Disposal: Dispose of in accordance with local, regional, and national regulations; Hazardous waste (flammable, self-heating); Use authorized disposal facilities; Incineration with energy recovery possible.

DETECTION METHODS:

SODIUM DITHIONITE vs ALTERNATIVES COMPARISON:

LEGAL DISCLAIMER:
The information provided in this document is based on our current knowledge and experience and is presented in good faith. However, as all conditions of use are beyond our control, it does not constitute a binding specification or warranty. This Technical Data Sheet is for informational purposes only. Users are responsible for testing the suitability for their own applications and for complying with all local, regional, and national regulations. For complete safety, storage, use, handling, waste, and regulatory compliance information, please refer to the official Safety Data Sheet (SDS/MSDS) provided by the manufacturer/supplier. Sodium dithionite is a flammable, self-heating substance; strict safety protocols must be followed at all times.