Manufacturing method of sodium hydrosulfide
I. Introduction
Sodium hydrosulfide (NaHS) is an important inorganic chemical widely used in chemical industry, metallurgy, medicine, pesticide, textile and other fields. In this paper, we will introduce the manufacturing method of sodium hydrosulfide, including raw materials, process flow, operation steps, equipment, quality control and safety measures.
Second, raw materials
The main raw materials for the manufacture of sodium hydrosulfide are sodium hydroxide and hydrogen sulfide. Sodium hydroxide should be industrial grade with purity not less than 96%, and hydrogen sulfide gas should meet the relevant national standards.
Three, process flow
The manufacturing process of sodium hydrosulfide is as follows:
1. Sodium hydroxide configuration: add sodium hydroxide solid into appropriate amount of water, stirring to dissolve, to make sodium hydroxide solution.
2. Hydrogen Sulfide Passing: Pass the hydrogen sulfide gas into the sodium hydroxide solution for reaction to generate sodium hydrosulfide.
3. Crystallization: The reaction solution is cooled and crystallized to obtain sodium hydrosulfide crystals.
4. Centrifugal Separation: The crystallized material is centrifuged to obtain the finished product of sodium hydrosulfide.
5. Drying: Dry the finished product of sodium hydrosulfide after centrifugal separation.
4. Operation steps
1. Add sodium hydroxide solid into the dissolving tank according to the specified proportion, add appropriate amount of water, stir and dissolve to make sodium hydroxide solution.
2. Open the hydrogen sulfide gas valve, pass the hydrogen sulfide gas into the sodium hydroxide solution, control the gas speed and reaction temperature, and carry out the reaction to generate sodium hydrosulfide.
3. When the pH value in the reaction solution reaches a certain value, stop the aeration, cool the reaction solution to a certain temperature, and crystallize and precipitate sodium hydrosulfide.
4. Put the crystallized material into a centrifuge, and carry out centrifugal separation to get the finished product of sodium hydrosulfide.
5. Put the finished product of sodium hydrosulfide after centrifugal separation into the drying equipment and carry out drying treatment to get the final product of sodium hydrosulfide.
5. Equipment
The equipment to be used in the manufacture of sodium hydrosulfide includes dissolving tank, reactor, crystallization tank, centrifuge, drying equipment and so on. These equipments should meet the relevant production standards and safety requirements, and need to undergo regular maintenance and overhaul to ensure the normal operation and safe use of the equipment.
Sixth, quality control
In order to ensure the quality of sodium hydrosulfide products, strict quality control is needed. It mainly includes the following aspects:
1. Raw material control: make sure the quality of sodium hydroxide and hydrogen sulfide gas meets the relevant standards.
2. Reaction control: Control the aeration speed, reaction temperature and time to ensure the quality and yield of sodium hydrosulfide generated by the reaction.
3. Product testing: carry out quality testing on the produced sodium hydrosulfide products, including purity, moisture, pH value and other indexes, to ensure that the product quality meets the relevant standards.
VII. Safety measures
There are certain safety hazards in the manufacturing process of sodium hydrosulfide, so it is necessary to take corresponding safety measures:
1. Hydrogen sulfide gas is poisonous and harmful, so it is necessary to strictly control the ventilation speed and reaction temperature to avoid gas leakage and personnel poisoning accidents.
2. Safety warning signs and fire-fighting facilities should be set up at the production site to ensure personnel safety and emergency response capability.
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 operation process.
VIII.CONCLUSION
Sodium hydrosulfide, as an important chemical raw material, needs to be strictly controlled during the manufacturing process to ensure the quality of raw materials, reaction conditions and product quality and other factors to ensure the quality and yield of the product. At the same time, the implementation and management of safety measures need to be strengthened to guarantee the safety and stability of the production process.
