Anhydrous sodium sulfite is an important raw material for the production of chemicals, which is widely used in printing and dyeing, papermaking, pharmaceuticals, synthetic fibers and other fields. This article will introduce the manufacturing method of anhydrous sodium sulfite, including raw material preparation, reaction process, post-treatment and other aspects.
I. Raw material preparation
The main raw materials for manufacturing anhydrous sodium sulfite are caustic soda and sulfur dioxide gas. In the raw material preparation process, the quality and purity of the raw materials need to be ensured to avoid adverse effects on the subsequent reaction.
II. Reaction Process
1. Absorption of Sulfur Dioxide Gas
Caustic soda is prepared into a certain concentration of lye, and air containing sulfur dioxide gas is passed through, so that the lye absorbs the sulfur dioxide gas to produce a mixture of sodium sulfite and sodium bisulfite.
2. Dehydration
Add the mixture into a vacuum tank, heat and vacuum to evaporate the water in the mixture to obtain anhydrous sodium sulfite.
III. Post-processing
1. Cooling
The anhydrous sodium sulfite was removed from the vacuum tank and cooled to room temperature.
2. Crushing
Crush the cooled anhydrous sodium sulfite to obtain a certain particle size of the product.
4. Precautions
1. During the manufacturing process, the reaction temperature and pH need to be strictly controlled to ensure the smooth progress of the reaction and the quality of the product.
2. In the dehydration process, it is necessary to keep the vacuum degree and heating temperature stable in order to avoid the product lumping and darkening of color.
3. In the post-treatment process, it is necessary to pay attention to the storage and transportation of the product to avoid moisture and deterioration of the product.
In short, the manufacture of anhydrous sodium sulfite needs to strictly control the process parameters and operating procedures of each link to ensure the quality and yield of the product. At the same time, it is necessary to strengthen the maintenance and upkeep of the equipment to ensure the normal operation and service life of the equipment.
