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[Chemical Knowledge]：Production and manufacturing method and process flow of sodium thiosulfate

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Sodium thiosulfate (Na2S2O3) is a common raw material for chemical production, which is widely used in photography, printing and dyeing, medicine, analytical chemistry and other fields. This article will introduce a method of manufacturing sodium thiosulfate, which is prepared by chemical reaction using sodium hydroxide (NaOH), sodium sulfide (Na2S) and sulfuric acid (H2SO4) as raw materials.

1. raw material preparation

1. sodium hydroxide: industrial grade sodium hydroxide, purity ≥ 96%, white solid particles.
2. Sodium sulfide: industrial grade sodium sulfide, purity ≥ 95%, yellow crystalline particles.
3. Sulfuric acid: industrial grade sulfuric acid, concentration of about 98%, colorless transparent liquid.

2. reaction principle

sodium thiosulfate preparation reaction equation is: 2NaOH + Na2S + H2SO4 → 2Na2S2O3 + 2H2O. In this reaction, sodium hydroxide and sodium sulfide are first reacted to form sodium hydrosulfide (NaHS), which is then reacted with sulfuric acid to form sodium thiosulfate and water.

3. manufacturing process

1 ingredients: according to a certain proportion of sodium hydroxide, sodium sulfide and sulfuric acid into the reaction kettle, stirring.
2. Reaction: control the reaction temperature within a certain range, so that the raw materials fully react to generate sodium thiosulfate.
3. Crystallization: The reaction solution was cooled to a certain temperature to precipitate sodium thiosulfate as a crystal.
4. Centrifugation: The crystallization was separated from the mother liquor by a centrifuge to obtain a wet product of sodium thiosulfate.
5. Drying: The wet sodium thiosulfate is dried to obtain a dried sodium thiosulfate product.
Precautions for
4.

1. Control the reaction temperature: Too high temperature may cause side reactions and affect product quality.
2. Adjust the pH value: During the reaction, it is necessary to adjust the pH value in time to promote the reaction.
3. Centrifugal separation conditions: Select the appropriate centrifugal speed and time to ensure the effective separation of crystallization and mother liquor.
4. Drying method selection: According to the nature of the product and production conditions, choose the appropriate drying method to ensure product quality.

5. Product Quality Standards The sodium thiosulfate products prepared by

shall meet the following quality standards: white or slightly yellowish crystalline particles with purity ≥ 98%, water insoluble ≤ 0.1, free alkali ≤ 0.5 and sulfate ≤ 0.05.

6. waste disposal
The waste generated by the
in the production process should be properly disposed of to avoid pollution to the environment. For example, mother liquor can be recycled after treatment, solid waste should be classified, and hazardous waste should be safely disposed of in accordance with relevant regulations.

In short, the manufacturing method of sodium thiosulfate involves multiple links and precautions. In order to ensure product quality and production safety, it is necessary to strictly control various process parameters and operating processes. At the same time, the waste should be properly treated to realize the green and sustainable development of the production process.

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