Sodium hydrosulfide is an important chemical raw material
2026-06-01
sodium hydrosulfide is an important chemical raw material and by-product, and its evaporation and concentration process faces unique challenges such as strong corrosiveness and high thermal sensitivity.
Analysis of the Special Characteristics of the Sodium Hydrosulfide Evaporation Process
The evaporation of sodium hydrosulfide solutions differs significantly from that of conventional salts, mainly in two aspects: material properties and process requirements.
Chemically, sodium hydrosulfide readily hydrolyzes at high temperatures, producing hydrogen sulfide gas and sodium hydroxide. This reaction not only causes the loss of active ingredients but also leads to severe equipment corrosion. Experimental data shows that the hydrolysis rate of sodium hydrosulfide rises exponentially when the temperature exceeds 80°C, requiring precise control of operating temperatures in the evaporation system.
Physically, sodium hydrosulfide solutions are strongly alkaline and highly corrosive, imposing strict requirements on equipment materials. Conventional stainless steels develop pitting corrosion and stress corrosion cracking after prolonged contact, necessitating the use of special alloys or lining technologies. Meanwhile, sulfide ions in the solution react with metal surfaces to form a loose FeS layer, further accelerating corrosion. Operational data indicates that the service life of unprotected carbon steel equipment in a sodium hydrosulfide environment typically does not exceed 6 months.
Typical physical parameters of sodium hydrosulfide solutions include: a boiling point elevation of 15–25°C for a 30% concentration solution; a corrosion rate of 0.5–2.0 mm/year for 316L stainless steel at 80°C; a hydrolysis rate of 3–8% per hour at 90°C under atmospheric pressure; and a crystallization temperature of 40–60°C for saturated solutions.
The evaporation of sodium hydrosulfide solutions differs significantly from that of conventional salts, mainly in two aspects: material properties and process requirements.
Chemically, sodium hydrosulfide readily hydrolyzes at high temperatures, producing hydrogen sulfide gas and sodium hydroxide. This reaction not only causes the loss of active ingredients but also leads to severe equipment corrosion. Experimental data shows that the hydrolysis rate of sodium hydrosulfide rises exponentially when the temperature exceeds 80°C, requiring precise control of operating temperatures in the evaporation system.
Physically, sodium hydrosulfide solutions are strongly alkaline and highly corrosive, imposing strict requirements on equipment materials. Conventional stainless steels develop pitting corrosion and stress corrosion cracking after prolonged contact, necessitating the use of special alloys or lining technologies. Meanwhile, sulfide ions in the solution react with metal surfaces to form a loose FeS layer, further accelerating corrosion. Operational data indicates that the service life of unprotected carbon steel equipment in a sodium hydrosulfide environment typically does not exceed 6 months.
Typical physical parameters of sodium hydrosulfide solutions include: a boiling point elevation of 15–25°C for a 30% concentration solution; a corrosion rate of 0.5–2.0 mm/year for 316L stainless steel at 80°C; a hydrolysis rate of 3–8% per hour at 90°C under atmospheric pressure; and a crystallization temperature of 40–60°C for saturated solutions.
About Zibo Anhao Chemical Co., Ltd. 
Sodium Hydrosulfide (NaHS)
Zibo Anhao Chemical Co., Ltd. is a professional supplier of high-quality Sodium Hydrosulfide, a widely used inorganic chemical with CAS No. 16721-80-5. Our product is available in solid flake and liquid forms, featuring high purity, stable chemical properties and good solubility in water.
It is extensively applied across multiple industries: as a flotation agent in mining for non-ferrous metal processing; a dehairing and tanning auxiliary in the leather industry; a reducing agent and dye assistant in textile and dyeing fields; as well as a key raw material for chemical synthesis, wastewater treatment and paper making.
We adopt strict quality control standards and provide flexible packaging solutions. With sufficient stock and efficient logistics, we can fulfill bulk orders and deliver goods on time. Welcome global customers to contact us for cooperation.
Zibo Anhao Chemical Co., Ltd. is a professional supplier of high-quality Sodium Hydrosulfide, a widely used inorganic chemical with CAS No. 16721-80-5. Our product is available in solid flake and liquid forms, featuring high purity, stable chemical properties and good solubility in water.
It is extensively applied across multiple industries: as a flotation agent in mining for non-ferrous metal processing; a dehairing and tanning auxiliary in the leather industry; a reducing agent and dye assistant in textile and dyeing fields; as well as a key raw material for chemical synthesis, wastewater treatment and paper making.
We adopt strict quality control standards and provide flexible packaging solutions. With sufficient stock and efficient logistics, we can fulfill bulk orders and deliver goods on time. Welcome global customers to contact us for cooperation.
Email: info@anhaochemical.com