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[Chemical Knowledge]：Manufacturing method and process flow of sodium dithionite

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Sodium dithionite, also known as sodium hydrosulfite, is an important chemical raw material, widely used in textile, printing and dyeing, paper, food and other industries. This article will introduce the manufacturing method of sodium dithionite, including raw material preparation, reaction process, post-treatment and other links.

1. Raw Material Preparation

The main raw materials for the manufacture of sodium dithionite are sodium hydroxide, sulfur dioxide and methanol. Among them, sodium hydroxide is used as an alkaline absorbent, sulfur dioxide is used as a sulfur source, and methanol is used as a reducing agent and a solvent. In order to ensure the quality and purity of the product, strict quality control and screening of raw materials are required.

2. reaction process

The manufacturing process of sodium dithionite mainly includes the following steps:

1. Absorption: The sodium hydroxide solution reacts with sulfur dioxide gas to generate sodium sulfite.
2. Reduction: The sodium sulfite solution is reacted with methanol under acidic conditions to generate sodium dithionite.
3. Crystallization: The reaction solution was cooled and crystallized to obtain sodium dithionite crystals.
4. Separation: The crystals were separated from the mother liquor to obtain pure sodium dithionite product.

In the above reaction process, it is necessary to control the reaction temperature, pH value, raw material ratio and other parameters to ensure the smooth progress of the reaction and the purity of the product. At the same time, the reaction equipment needs to be optimized and improved to improve production efficiency and product quality.

3. post-treatment
The sodium dithionite products manufactured by
need to be post-treated, including drying, packaging, storage and other links. In order to ensure the quality and stability of the product, it is necessary to strictly control and manage the post-processing process.

In short, the manufacturing method of sodium dithionite needs to consider multiple links such as raw material preparation, reaction process, and post-treatment to ensure the quality and purity of the product. At the same time, it is necessary to continuously optimize the production process and improve production efficiency, reduce costs, and improve the competitiveness of enterprises.

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