Potassium sulfite is an inorganic substance with the chemical formula K2SO3, white crystals, soluble in water, insoluble in ethanol, heated to 130 decomposition. used as a reducing agent, preservative, dechlorinating agent, for the preparation of sulfite, thiosulfate, bisulfite, etc.
The production methods of potassium sulfite are mainly as follows:
1.Ore melting method: sulfite minerals such as sulfurite are crushed to a certain particle size and then added to the melting furnace, and then coke powder or pulverized coal is added, burned and melted at high temperature, and the sulfide generated is oxidized into sulfate at high temperature, and then cooled, crystallized, separated and dried to obtain the product.
2.Liquid sulfur dioxide method: liquid sulfur dioxide and potassium hydroxide solution are mixed in a certain proportion, activated carbon is added for decolorization after reaction, and then filtered, crystallized and centrifuged, and finally dried to obtain the product.
3.Sodium formate method: sodium formate is added to dilute sulfuric acid for reaction, carbon dioxide is introduced for carbonization, and when the reaction solution is close to neutral, a small amount of sodium formate is added for secondary carbonization, and then filtered, crystallized and dried to obtain the product.
4.*Method: Made from sulfite waste liquid in industrial by-products**.
Potassium sulfite is versatile and can be used in a variety of fields. In the food industry, potassium sulfite is mainly used as antioxidants and preservatives for jams, dried fruits and other foods, which can extend the shelf life of food, and can also be used to make food additives such as starch sugar and blood tonics. In the pharmaceutical industry, potassium sulfite can be used to synthesize a variety of drugs, such as antibacterial drugs, anticancer drugs, etc. In addition, potassium sulfite can also be used as a reducing agent and bleach agent in textile, printing and dyeing, papermaking and other industries.
The safety of potassium sulfite is also one of the important factors for its widespread application. According to the research and evaluation of authoritative institutions, potassium sulfite is considered to be a low-toxicity, non-irritating substance, and has little impact on the environment and human health. However, in some cases, high concentrations of potassium sulfite may cause irritation or discomfort to the body's respiratory system,** and eyes, among others. Therefore, it is necessary to take appropriate safety measures when using potassium sulfite, such as wearing protective clothing and gloves, avoiding direct contact with highly concentrated solutions, etc.
In conclusion, potassium sulfite is an important inorganic salt product with a wide range of application prospects and market demand. With the continuous progress of science and technology and the improvement of industrialization, the production process and technology of potassium sulfite are also constantly improving and perfecting. It is believed that in the future, potassium sulfite will be applied in more fields, bringing more convenience and contribution to human production and life. Food bleach