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[Chemical Knowledge]：The production and manufacturing method and process of sodium hydrogen sulfide.

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The manufacturing method
of sodium hydrosulfide
1. Introduction

Sodium hydrosulfide (NaHS) is an important inorganic chemical, widely used in chemical industry, metallurgy, medicine, pesticide, textile and other fields. This article will introduce the manufacturing method of sodium hydrosulfide, including raw materials, process flow, operation steps, equipment, quality control and safety measures.

2. Raw Material

The main raw materials for the manufacture of sodium hydrosulfide are sodium hydroxide and hydrogen sulfide. The sodium hydroxide shall be of industrial grade with a purity of not less than 96%, and the hydrogen sulfide gas shall meet the relevant national standards.

3. Process
The manufacturing process of
sodium hydrosulfide is as follows:

1. Sodium hydroxide configuration: Add sodium hydroxide solid into an appropriate amount of water, stir and dissolve to make sodium hydroxide solution.
2. hydrogen sulfide introduction: hydrogen sulfide gas is introduced into sodium hydroxide solution to react to generate sodium hydrosulfide.
3. Crystallization: The reaction solution was cooled and crystallized to obtain sodium hydrosulfide crystal.
4. Centrifugal separation: The crystallized material is centrifuged to obtain a finished product of sodium hydrosulfide.
5. Drying: The finished product of sodium hydrosulfide separated by centrifugation is dried.

4. Operation Steps

1. According to the specified ratio, add sodium hydroxide solid into the dissolving tank, add appropriate amount of water, stir and dissolve to make sodium hydroxide solution.
2. Open the hydrogen sulfide gas valve, the hydrogen sulfide gas into the sodium hydroxide solution, control the ventilation rate and reaction temperature, the reaction to generate sodium hydrosulfide.
3. When the pH value in the reaction solution reaches a certain value, the aeration is stopped, and the reaction solution is cooled to a certain temperature to crystallize and precipitate sodium hydrosulfide.
4. Put the crystallized material into a centrifuge and perform centrifugal separation to obtain a finished product of sodium hydrosulfide.
5. Put the centrifuged finished product of sodium hydrosulfide into a drying device and perform drying treatment to obtain a final product of sodium hydrosulfide.

5. equipment

The equipment used in the manufacture of sodium hydrosulfide includes dissolving tank, reaction kettle, crystallization tank, centrifuge, drying equipment, etc. These equipment should meet the relevant production standards and safety requirements, and need to be regularly maintained and overhauled to ensure the normal operation and safe use of the equipment.

6. quality control

In order to ensure the quality of sodium hydrosulfide products, strict quality control is required. It mainly includes the following aspects:

1. Raw material control: ensure that the quality of sodium hydroxide and hydrogen sulfide gas meets relevant standards.
2. Reaction control: control the ventilation rate, reaction temperature and time to ensure the quality and yield of sodium hydrosulfide.
3. Product testing: quality testing of the produced sodium hydrosulfide products, including purity, moisture, pH and other indicators, to ensure that the product quality meets the relevant standards.

7. safety measures

there are certain safety hazards in the manufacturing process of sodium hydrosulfide, so corresponding safety measures need to be taken:

1. Hydrogen sulfide gas is toxic and harmful, and it is necessary to strictly control the ventilation speed and reaction temperature to avoid gas leakage And the occurrence of personnel poisoning accidents.
2. Safety warning signs and fire-fighting facilities shall be set up on the production site to ensure the safety of personnel and the improvement of emergency handling capacity.
3. Operators need to be professionally trained to understand the nature of the product and operating procedures to ensure the safety and stability of the operating process.

8. conclusion

sodium hydrosulfide as an important chemical raw material, in the manufacturing process need to strictly control the quality of raw materials, reaction conditions and product quality and other factors to ensure product quality and yield. At the same time, it is necessary to strengthen the implementation and management of safety measures to ensure the safety and stability of the production process.

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