Sodium sulfite, a vital chemical compound, plays a significant role in various industries, including food preservation, water treatment, and paper manufacturing. In China, its production and application have grown substantially, reflecting the country’s expanding industrial landscape. Understanding sodium sulfite’s properties and uses is essential for professionals and enthusiasts alike.
This guide delves into the production processes, regulatory frameworks, and market dynamics surrounding sodium sulfite in China. Readers will gain insights into its applications, benefits, and potential challenges faced by the industry.
Additionally, the guide will explore the environmental implications of sodium sulfite usage and the ongoing efforts to promote sustainable practices. By the end, readers will have a comprehensive understanding of sodium sulfite’s significance in China and its impact on various sectors.
Comprehensive Guide to Sodium Sulfite in China
Sodium sulfite, also known as sodium sulphite, is a soluble sodium salt of sulfurous acid with the chemical formula Na2SO3. It is widely used in various industries, including food preservation, photography, and water treatment. This guide will delve into the technical features, types, and applications of sodium sulfite, particularly focusing on its production and suppliers in China.
Technical Features of Sodium Sulfite
Sodium sulfite is characterized by its white crystalline powder form and its ability to dissolve in water. Below is a comparison table highlighting its key technical features:
| Feature | Description |
|---|---|
| Chemical Formula | Na2SO3 |
| Molecular Weight | 126.04 g/mol |
| Appearance | White crystalline powder |
| Solubility | Soluble in water (67.8 g/100 mL at 18 °C) |
| Melting Point | 150 °C (decomposes with water loss) |
| Density | 2.63 g/cm³ |
| CAS Number | 7757-83-7 |
| pH | Alkaline (pH 9 to 9.5 in solution) |
Types of Sodium Sulfite
Sodium sulfite is available in various forms, each suited for specific applications. The following table outlines the different types of sodium sulfite and their characteristics:
| Type | Description |
|---|---|
| Sodium Sulfite Anhydrous | A dry form, used in chemical synthesis and as a reducing agent. |
| Sodium Sulfite Food Grade | Purified for use in food preservation and processing. |
| Sodium Sulfite Industrial Grade | Used in industrial applications, such as water treatment and textile processing. |
| Sodium Sulfite Liquid | A solution form, often used in photography and as a bleaching agent. |
Applications of Sodium Sulfite
Sodium sulfite has a wide range of applications across various industries:
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Food Preservation: It is commonly used as a preservative to prevent discoloration in dried fruits and meats. Its ability to inhibit oxidation makes it valuable in food processing.
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Photography: Sodium sulfite is utilized in photographic developers to control the pH and enhance image quality.
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Water Treatment: It acts as an oxygen scavenger in water treatment processes, preventing corrosion in steam boilers.
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Textile Industry: In textiles, sodium sulfite is used as a bleaching agent and for desulfurizing processes.
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Chemical Production: It serves as a reducing agent in various chemical reactions, including the production of sodium thiosulfate.
Suppliers of Sodium Sulfite in China
China is home to several prominent manufacturers and suppliers of sodium sulfite. Here are some notable companies:
– Guangdi Chemical Company (gdchemical.com): A leading manufacturer of sodium hydrosulfite and sodium sulfite, known for its commitment to quality and innovation.
– Fengchen Group (www.fengchengroup.com): Offers a range of sodium sulfite products, including food-grade and industrial-grade options, emphasizing quality control and customer satisfaction.
– Bergano Chemical Co., Ltd (berganochem.com): Specializes in food additives, including sodium sulfite, with a focus on high-quality production standards.
– Qingdao Tianya Chemical Co., Ltd (sodiummetabisulfite.cn): A major supplier of sodium sulfite anhydrous, catering to various industrial applications.
– Toption Chemical (www.toptionchem.com): Provides a variety of sodium sulfite products, including anhydrous and liquid forms, for diverse applications.
Conclusion
Sodium sulfite is a versatile chemical with significant applications in food preservation, photography, water treatment, and more. Its various forms cater to different industry needs, making it an essential compound in many sectors. With several reputable suppliers in China, businesses can access high-quality sodium sulfite products to meet their specific requirements.
FAQs
1. What is sodium sulfite used for?
Sodium sulfite is primarily used as a preservative in food, a reducing agent in chemical processes, and a bleaching agent in textiles.
2. Is sodium sulfite safe for food use?
Yes, sodium sulfite is generally recognized as safe for food use when used within regulated limits.
3. How is sodium sulfite produced?
Sodium sulfite is produced by reacting sulfur dioxide with sodium carbonate or sodium hydroxide.
4. Can sodium sulfite be used in photography?
Yes, sodium sulfite is commonly used in photographic developers to control pH and enhance image quality.
5. Where can I buy sodium sulfite in China?
Sodium sulfite can be purchased from various suppliers in China, including Guangdi Chemical, Fengchen Group, Bergano Chemical, Qingdao Tianya Chemical, and Toption Chemical.
