Sodium Hydrosulfite Na2s2o4 88% Bleaching Agents

• CAS No.: 7775-14-6
• Formula: Na2s2o4
• EINECS: 231-890-0
• Colour: White
• Appearance: Powder
• Usage: Paper, Textile
• Model NO.: Sodium Hydrosulfite
• Application Material: Natural Silk
• Content: 88%
• C.I.No.: Vat Yellow 1
• Transport Package: Iron Drum
• Specification: 50kg
• Origin: China
• HS Code: 2831101000
• Production Capacity: 50000mt / Year

Product Description

Industry

Being water-soluble, sodium dithionite is used as a reducing agent in some industrial dyeing processes. In the case of sulfur dyes and vat dyes, an otherwise water-insoluble dye can be reduced into a water-soluble alkali metal salt (e.g. indigo dye).

Sodium dithionite can also be used for water treatment, aquarium water conditioners, gas purification, cleaning, and stripping. It has also been applied as a sulfonating agent. In addition to the textile industry, this compound is used in industries concerned with leather, foods, polymers, photography, and many others, often as a decolourising agent. It is even used domestically as a decoloring agent for white laundry, when it has been accidentally stained by way of a dyed item slipping into the high temperature washing cycle. It is usually available in 5 gram sachets termed hydrosulfite after the antiquated name of the salt.

It is the an active ingredient in "Iron Out Rust Stain Remover", a commercial rust product.

Sodium dithionite is stable when dry, but aqueous solutions deteriorate due to the following reaction:

2 S2O42− + H2O → S2O32− + 2 HSO3−
This behavior is consistent with the instability of dithionous acid. Thus, solutions of sodium dithionite cannot be stored for a long period of time.

Anhydrous sodium dithionite decomposes to sodium sulfate and sulfur dioxide above 90 °C in the air. In absence of air, it decomposes quickly above 150 °C to sodium sulfite, sodium thiosulfate, sulfur dioxide and trace amount of sulfur.