Potassium Sulphite is indeed an inorganic, non-flammable, white, and soluble substance. It consists of potassium cations (K+) and sulfite anions (SO3^2- ) and is used for various purposes, including as a food preservative in the food industry.

Potassium Sulphite is a source of sulfurous acid (H2SO3) when dissolved in water, and its preservative properties arise from its ability to inhibit the growth of microorganisms that can spoil or degrade food products. By reducing the activity of bacteria, yeasts, and molds, it helps extend the shelf life of certain food items.

Structure of Potassium Sulphite

The structural formula of Potassium Sulphite is shown in the below diagram

Physical Properties

  • Appearance: A white powder
  • Molecular weight:254 g/mol
  • Density: 2.35 g/cm3
  • Purity: 45% W/W
  • Its melting point is greater than 590οC
  • Specific Gravity: 1.447 to 1.465
  • Assay as K2SO3: 45% W/W
  • pH: 9 to 10 pH

 

Health Hazards

  • Can cause eye and skin irritation
  • Can cause gastric irritation
  • Can cause respiratory irritation

 

Safety Measures to Consider

  • Avoid contact with eyes and skin.
  • Wear protective glasses and gloves.
  • Avoid inhalation.
  • Store in original containers and securely sealed the containers
  • Avoid exposure to the environment.

 

Uses in Various Industries

  • Potassium Sulphite commonly used as a food preservative
  • Used as a reducing agent in chemical industry.
  • Used for dyeing clothes and cotton printing in the textile industry.
  • Used to precipitate gold from the solution of Aqua Regia.

 

Here's a bit more detail about how Potassium Sulphite is used in the industries:

  1. Detergent Industry: Potassium sulphite can be used as an antioxidant and reducing agent in some formulations of detergents. It helps prevent the oxidation of certain components and contributes to the stability of the detergent product.
  2. Specialty Chemicals: Similar to its application in the detergent industry, potassium sulphite can be used as a reducing agent or antioxidant in various specialty chemical formulations. Its properties make it valuable in specific chemical reactions and processes.
  3. Photographic Chemicals: Potassium sulphite can be used in the production of photographic chemicals, particularly as a component in developing solutions. It helps prevent oxidation and aids in the reduction of silver ions during the development process.
  4. Fixer and Developers: In photographic processes, fixer solutions are used to remove unexposed silver halide from photographic prints or film. Potassium sulphite can be an important ingredient in fixer formulations.
  5. Dyes & Dyes Intermediate: Potassium sulphite can be employed in the dye industry for certain dyeing processes. Its reducing properties can play a role in specific dye reactions and contribute to color development.
  6. Boiler Treatment Chemicals: Like potassium hydroxide, potassium sulphite can be used in boiler water treatment as an oxygen scavenger. It helps prevent corrosion and scale formation by reacting with dissolved oxygen.

Shakti Chemicals are among the largest manufacturer and exporter of potassium sulphite solution in India and overseas. Potassium Sulphite's reducing and antioxidant properties make it a valuable additive in various industrial processes where preventing oxidation, stabilizing formulations, and enhancing certain reactions is important. As with any chemical, proper handling, storage, and safety protocols are crucial when working with potassium sulphite