Sodium Hydrosulphide (Sodium Hydrosulfide) 

SPECIFICATION

Item	Index
NaHS(%)	70% min
Fe	30 ppm max
Na2S	3.5%max
Water  Insoluble	0.005%max

usage

 used in mining industry as inhibitor , curing agent , removing agent

used in synthetic organic intermediate and preparation of sulfur dye additives .

  Used in textile industry as a bleaching, as a desulfurizing and as a dechlorinating agent

used in pulp and paper industry.

used in water treatment as an oxygen scavenger agent.

OTHER USED

♦ In the photographic industry to protect developer solutions from oxidation.
♦ It is used in the production of rubber chemicals and other chemical compounds.
♦ It is use in other applications include ore flotation, oil recovery, food preservative, making dyes, and detergent.

Handling and Storage

A.Precautions for Handling

1.Handling is performed in a well ventilated place.

2.Wear suitable protective equipment.

3.Avoid contact with skin and eyes.

4.Keep away from heat/sparks/open flames/ hot surfaces.

5.Take precautionary measures against static discharges.

B.Precautions for Storage

1.Keep containers tightly closed.

2.Keep containers in a dry, cool and well-ventilated place.

3.Keep away from heat/sparks/open flames/ hot surfaces.

4. Store away from incompatible materials and foodstuff containers.

Physical and chemical properties of sodium hydrosulphide(NAHS)

1. Physical properties

Appearance: Sodium hydrosulfide is usually a white or light yellow crystalline powder. It may also be a colorless to yellow, deliquescent crystal with a hydrogen sulfide odor.

Melting point: The melting point of anhydrous sodium hydrosulfide is 350°C; the melting point of the hydrate is lower, at 52-54°C. However, some data show that the melting point of sodium hydrosulfide is 55°C.

Density: The density of sodium hydrosulfide is 1.79 g/cm³, or 1790 kg/m³.

Solubility: Sodium hydrosulfide is easily soluble in water and alcohol, and its aqueous solution is alkaline. According to some data, the solubility of sodium hydrosulfide in water is 620g/L at 20°C.

2. Chemical properties

Acidity and alkalinity: The aqueous solution of sodium hydrosulfide is alkaline.

Reaction with acid: Sodium hydrosulfide releases hydrogen sulfide gas when it meets acid. The reaction equation is: NaHS + H+ → H2S↑ + Na+.

Reaction with sulfur: Sodium hydrosulfide can react with sulfur to form polysulfides, the reaction equation is: 2NaHS + 4S → Na2S4 + H2S.

Reducibility: Sodium hydrosulfide is a commonly used reducing agent that can undergo redox reactions with many oxidants.

3. Other properties

Stability: Sodium hydrosulfide is a stable compound, but it is hygroscopic. At the same time, it is also a flammable solid and may ignite in the air.

Toxicity: Sodium hydrosulfide is toxic to a certain extent and harmful to the human body and the environment. Therefore, special attention should be paid to safety protection during use and storage.