Baking soda (sodium thiosulfate, Na2S2O3) is a common raw material for the production of chemicals, which is widely used in photography, printing, medicine, textile and other industries. This article will introduce the manufacturing method of baking soda.
I. Preparation of raw materials
The main raw materials for manufacturing baking soda include sodium hydroxide (NaOH), sulfur yellow (S) and sodium sulfite (Na2SO3). In order to ensure the quality and purity of the product, it is necessary to select high-quality raw materials and ensure that the ratio of raw materials is reasonable.
II. Reaction Principle
The manufacturing process of baking soda involves the following chemical reactions:
1. Sodium hydroxide reacts with sulfur yellow to form sodium polysulfide (Na2Sx):
NaOH + S → Na2Sx + H2O
2. Sodium polysulfide reacts with sodium sulfite to form sodium thiosulfate (Na2S2O3) and sodium sulfate (Na2SO4):
Na2Sx + Na2SO3 → Na2S2O3 + Na2SO4
III. Manufacturing process
The manufacturing process of baking soda mainly includes the following steps:
1. Dosing: add sodium hydroxide, sulfur yellow and sodium sulfite into the reactor according to the predetermined ratio.
2. Melting: Heat the reactor to melt the ingredients and mix them thoroughly.
3. Reaction: Under appropriate temperature and pressure, allow the raw materials to fully react to produce baking soda.
4. Cooling and Crystallization: After the reaction is finished, the reactor is cooled down so that the baking soda can be crystallized and precipitated.
5. Centrifugal Separation: Separate the crystallized baking soda from the mother liquor by centrifuge.
6. Drying: The separated crystallized baking soda is dried to obtain the final product.
4. Precautions
During the manufacturing process, the following matters need to be paid attention to in order to ensure the quality and yield of the product:
1. Control the reaction temperature and pressure to ensure the reaction goes on smoothly.
2. Strictly monitor the quality and proportion of raw materials to avoid impurities into the product.
3. Keep equipment clean to prevent equipment failure from affecting production.
4. Regularly check and maintain the production process to ensure the stable operation of the production line.
5. Product quality inspection
In order to ensure the quality of big soda products, strict quality inspection is needed, including appearance, purity, pH value, heavy metal content and many other indexes. For the unqualified products, rework or scrap treatment is needed to ensure the quality and safety of the products.
In short, the manufacturing process of big soda requires strict control of factors such as the quality of raw materials, reaction conditions and operation process to ensure the quality and yield of the product. At the same time, strict quality testing is needed to ensure the quality and safety of the product.
