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Sodium Sulphite Anhydrous

Anhydrous Sodium Sulfite, also known as sulfoxylate or sulfoxylate powder, is an odorless white crystalline or powdered inorganic compound belonging to the sulfite class.

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1. Products Information

Definition: Anhydrous Sodium Sulfite, also known as sulfoxylate or sulfoxylate powder, is an odorless white crystalline or powdered inorganic compound belonging to the sulfite class. It has strong reducibility, is easily oxidized, and features relatively active chemical properties.

Chemical Formula: Na₂SO₃

Molecular Weight: 126.04

CAS NO.: 7757-83-7

Industrial Grade Food Grade

PROJECT	INDEX
PROJECT	Premium	First Grade	Ordinary Goods
Main Content（Na₂SO₅）% ≥	97	96	93
Fe Content % ≤	0.003	0.005	0.02
Water Insoluble Matter % ≤	0.02	0.03	0.05
Free Base(Na₂SO₃) % ≤	0.1	0.4	0.8
Sodium Sulfate(Na₂SO₄) % ≤	2.5	--	--
Sodium Chloride(NaCl) % ≤	0.1	--	--

PROJECT	INDEX
Main Content（Na₂S₂O₅）,W/% ≥	96.0
Fe Content(mg/kg) ≤	0.01
Free Base（NaSO₃）,W/% ≤	0.60
Heavy Metal (pb)(mg/kg) ≤	10.0
As Content(mg/kg) ≤	2.0
Clarity	Through Experiments

Storage Conditions

Store in a cool, dry, and well-ventilated warehouse below 30℃. The packaging must be tightly sealed to avoid contact with air and prevent oxidation and deterioration. Meanwhile, keep it away from acids, oxidants, organic substances, etc. Due to its deliquescence, it is not suitable for long-term storage.

2. Physical Properties

Appearance: White hexagonal prismatic crystals or powder, odorless or with a slight sulfur dioxide odor.

Density: Approximately 2.63g/cm³; Melting Point: Approximately 500℃, at which it decomposes upon heating.

Solubility: Highly soluble in water, with a solubility of about 25.3 grams per 100 milliliters of water at 20℃. Its aqueous solution is alkaline, with a pH value of around 9-9.5. Slightly soluble in ethanol, insoluble in organic solvents such as liquid ammonia and liquid chlorine.

Refractive Index: 1.484; it is deliquescent and prone to state changes when absorbing moisture in humid environments.

3. Main Applications

● Food Industry

Serves as a reducing bleaching agent and preservative, applicable to foods like preserved fruits, glucose, bamboo shoots, and canned mushrooms. It inhibits the activity of oxidases in plant-based foods to prevent discoloration and deterioration, with clear limits on maximum usage and residual amounts.

● Textile Dyeing & Printing and Papermaking

Acts as a deoxidizer and bleaching agent in textile dyeing and printing, preventing local oxidation of cotton fibers during scouring and improving whiteness and fiber strength. In papermaking, it functions as a lignin remover to help decompose lignin in wood pulp.

● Water Treatment and Metallurgy

Can treat industrial wastewater from electroplating, dyeing and printing, etc., serving as a deoxidizer and dechlorinator for boiler feed water. In the metallurgical field, it is used for gold reduction; in the mining industry, it acts as a flotation and beneficiation agent for non-ferrous metal ores.

● Chemical and Pharmaceutical Industries

Used as a reducing agent in the production of various chemical products in the organic chemical industry, and also for manufacturing chemicals such as sodium hydrosulfite and sodium metabisulfite. In the pharmaceutical field, it is an intermediate raw material for producing drugs like metamizole sodium and aminopyrine.

● Other Fields

Serves as a film developer in the photographic and photosensitive industry; used for manufacturing photosensitive resistors in the electronic industry; also acts as a general analytical reagent for determining elements such as antimony, magnesium, and copper.

4. Packaging Specifications

25kg outer woven bag (with inner lining bag)

25kg kraft paper bag (with inner lining bag)

1000kg ton bag (with inner lining bag)

1250kg large bag (with inner lining bag)

Note: According to customer needs, we also provide other packaging methods, such as ton bags, full plastic bags, kraft paper bags, and drums. Different packaging options correspond to different costs.

5. Core Advantages

● Comprehensive and Efficient Functions

Integrates multiple functions such as reduction, bleaching, preservation, and deoxidation. It can efficiently remove impurities in wastewater treatment, rapidly inhibit oxidation reactions in food processing, and effectively protect fibers in the textile industry, delivering remarkable application results.

● Wide Application Scenarios

Covers multiple industries including food, textile, papermaking, metallurgy, pharmaceutical, and electronics. It can not only meet the needs of industrial production but also adapt to fields with high safety requirements such as food and medicine, featuring strong versatility.

● Convenient Use and Procurement

Simple operation methods without complex procedures; sufficient market supply with a variety of product specifications to meet the needs of different scenarios. Moreover, it is relatively cost-effective, helping enterprises reduce production costs.

● Controllable Chemical Properties

Although it is easily oxidized, its performance can remain stable as long as the packaging is properly sealed for storage. In addition, its reactions with sulfur dioxide, strong acids, etc., are regular, facilitating precise regulation of reaction processes in production.

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