Sodium sulfide, Inorganic compound. Pure Sodium sulfide is a colorless crystalline powder. Strong moisture absorption, easily soluble in water. The aqueous solution exhibits a strong alkaline reaction. Touching the skin and hair can cause burns. Therefore, Sodium sulfide is commonly known as alkali sulfide. Sodium sulfide aqueous solution will slowly oxidize into Sodium thiosulfate, Sodium sulfite, sodium sulfate and Sodium sulfide in air. As Sodium thiosulfate is generated rapidly, the main product of oxidation is Sodium thiosulfate. Sodium sulfide deliquests in the air, carbonates and deteriorates, constantly releasing hydrogen sulfide gas. Industrial Sodium sulfide is pink, brownish red and yellowish brown due to impurities. The specific gravity, melting point, and boiling point also vary due to the influence of impurities.
Sodium sulfide, a Inorganic compound, is also called stink alkali, stink soda, yellow alkali and sulfide alkali. Pure Sodium sulfide is a colorless crystalline powder. Strong moisture absorption, easily soluble in water. The aqueous solution exhibits a strong alkaline reaction. Touching the skin and hair can cause burns. Therefore, Sodium sulfide is commonly known as alkali sulfide. Sodium sulfide aqueous solution will slowly oxidize into Sodium thiosulfate, Sodium sulfite, sodium sulfate and Sodium sulfide in air. As Sodium thiosulfate is generated rapidly, the main product of oxidation is Sodium thiosulfate. Sodium sulfide deliquests in the air, carbonates and deteriorates, constantly releasing hydrogen sulfide gas. Industrial Sodium sulfide is pink, brownish red and yellowish brown due to impurities. The specific gravity, melting point, and boiling point also vary due to the influence of impurities.
Chemical name
Chinese name of chemicals: Sodium sulfide, Sodium sulfide monohydrate, Sodium sulfide dihydrate, caustic soda, caustic soda, xanthine, caustic sulfide
English name of chemical: sodium sulfide
Commonly known as: odorous alkali
Technical specification code: 950
Chemical formula of Sodium sulfide
Chemical formula: Na2S
Molecular weight: 78.04
Composition/Composition Information
Content of harmful substances CAS No
Sodium sulfide ≥ 60.0% 7757-83-7
Chemical equation for generating Sodium sulfide: 2Na+S===Na2S
Hazard Overview
This product can decompose into hydrogen sulfide in the gastrointestinal tract and can cause hydrogen sulfide poisoning after oral administration. It has corrosive effects on the skin and eyes. Environmental hazards: Harmful to the environment. Explosion hazard: This product is flammable, highly corrosive, and irritating, and can cause burns to the human body. Hazard characteristics: crystalline Sodium sulfide is strongly alkaline corrosive. Anhydrous Sodium sulfide is self igniting. Crystalline Sodium sulfide reacts with acids and emits toxic and flammable hydrogen sulfide gas. Slightly corrosive to most metals. Sulfur dioxide gas is released during combustion, and Sodium sulfide powder can form explosive mixture with air. Sulfide alkali is highly soluble in water, and the aqueous solution is highly alkaline. It has strong irritation and corrosiveness when in contact with the skin and mucous membranes. Sodium sulfide Jiushui can absorb carbon dioxide in the air and produce hydrogen sulfide. Contact with acids will react violently and release a large amount of hydrogen sulfide gas, which will cause serious poisoning if inhaled. Fire protection method: Use water to extinguish the fire. First aid: When eyes are irritated, rinse with plenty of water and seek medical attention; Rinse with plenty of water in case of skin contact; If taken by mistake, rinse your mouth immediately and seek medical attention. Test Item GB/T10500-2000 Measured value of standard value of Class I first-class product: Sodium sulfide (Na2S) content% ≥ 60.0 60.32 Sodium sulfite (Na2SO3)% ≤ 1.08 Sodium thiosulfate (Na2S2O3)% ≤ 0.86 iron (Fe) content% ≤ 0.12 0.10 sodium carbonate (Na2CO3)% ≤ 5.0 2.45 water insoluble content% ≤ 0.40 0.30
First aid measures
Skin contact: Immediately remove contaminated clothing and rinse with plenty of flowing water for at least 15 minutes. Seek medical attention.
Eye contact: Immediately lift the eyelids and rinse thoroughly with a large amount of flowing water or physiological saline for at least 15 minutes. Seek medical attention.
Inhalation: Quickly remove from the scene to a place with fresh air. Maintain unobstructed respiratory tract. If breathing is difficult, administer oxygen. If breathing stops, immediately perform artificial respiration. Seek medical attention.
Ingestion: Rinse mouth with water and drink milk or egg white. Seek medical attention.
Fire protection measures
Hazard characteristics: Anhydrous is self igniting, and its dust is easy to self ignite in the air. Decomposes when exposed to acid, releasing highly toxic and flammable gases. Powder and air can form explosive mixtures. Its aqueous solution is corrosive and strongly irritating. Evaporation begins at 100 ℃, and vapor can corrode the glass.
Harmful combustion products: hydrogen sulfide, sulfur oxide.
Fire extinguishing method: Use water, mist water, and sand to extinguish the fire.
Leakage emergency response
Emergency response: isolate the contaminated area and restrict access. It is recommended that emergency personnel wear dust masks (full face masks) and acid and alkali resistant work clothes. Enter the scene from the windward position. Small leakage: Avoid dust and collect with a clean shovel in a dry, clean, and covered container. You can also rinse with a large amount of water, dilute the washing water and put it into the wastewater system. Large amount of leakage: collected and recycled or transported to a waste treatment site for disposal.
Handling and Storage
Precautions for operation: Closed operation. Operators must undergo specialized training and strictly adhere to operating procedures. It is recommended that operators wear self-priming filter type Dust mask, chemical safety goggles, rubber acid and alkali resistant clothing, and rubber acid and alkali resistant gloves. Keep away from sparks and heat sources, and smoking is strictly prohibited in the workplace. Use explosion-proof ventilation systems and equipment. Avoid generating dust. Avoid contact with oxidants and acids. When transporting, it is necessary to load and unload gently to prevent damage to the packaging and containers. Equip corresponding types and quantities of firefighting equipment and emergency response equipment for leaks. Empty containers may have residual harmful substances.
Storage precautions: Store in a cool and ventilated warehouse. Keep away from sparks and heat sources. The humidity inside the warehouse should not exceed 85%. Packaging sealing. It should be stored separately from oxidants and acids, and mixed storage should be avoided. Not suitable for long-term storage to avoid spoilage. Equip corresponding types and quantities of fire-fighting equipment. The storage area should be equipped with suitable materials to contain leaks.
Exposure control/personal protection
Occupational exposure limit
China MAC (mg/m3): No standard established
Former Soviet MAC (mg/m3): 0.2
TLVTN: No standards established
TLVWN: No standards established
Monitoring method:
Engineering control: closed operation. Provide safety showers and eye wash equipment.
Respiratory system protection: When it is possible to contact with its dust, you must wear a self-priming filtering Dust mask. If necessary, wear an air respirator.
Eye protection: Wear chemical safety goggles.
Body protection: Wear rubber acid and alkali resistant clothing.
Hand protection: Wear rubber acid and alkali resistant gloves.
Other protections: Smoking, eating, and drinking are prohibited in the workplace, and hands should be washed before meals. After work, take a shower and change clothes. Pay attention to personal cleanliness and hygiene.
purpose
Titration analysis of cadmium. Mineral flotation. Analyze the hardness of water in nitrogen fertilizer production. Analyze the copper solution of ammonia water. Analyze copper ammonia solution of Ammonium bicarbonate. Metal purification. Electrogalvanizing, cadmium, etc.
The pharmaceutical industry is used to produce antipyretic drugs such as Phenacetin. [1]
Physical and chemical properties
Main ingredients: Content: Industrial Grade 1 ≥ 60.0%.
Appearance and properties: colorless or beige granular crystals, industrial products are reddish brown or brick red blocks.
Flaky, brownish red, easily soluble in water, slightly soluble in alcohol, insoluble in ether, its aqueous solution is strongly alkaline, easily oxidized in air, and toxic.
The strong Sodium sulfide solution has a bad smell because S2- hydrolyzes to generate hydrogen sulfide
S2-+H2O=HS -+OH -, HS -+H2O=OH -+H2S ↑
Due to the hydrolysis of OH -, it is alkaline
When Sodium sulfide is exposed to humid air, Na2S and its hydrate eject hydrogen sulfide.
PH:
Melting point (℃): 1180
Boiling point (℃): No data available
Relative density (water=1): 1.86
Relative vapor density (air=1): No data available
Saturated Vapor pressure (kPa): no data
Heat of combustion (kJ/mol): no data
Critical temperature (℃): meaningless
Critical pressure (MPa): meaningless
Logarithmic value of octanol/water Partition coefficient: no data
Flash point (℃): meaningless
Ignition temperature (℃): No data available
Upper explosion limit% (V/V): No data available
Lower explosive limit% (V/V): No data available
Thermodynamic function (298.15K, 100kPa):
Standard molar heat of formation Δ FHm θ (kJ · mol ^ -1): -364.8
Gibbs free energy of standard molar formation Δ FGm θ (kJ · mol ^ -1): -349.8
Standard entropy Sm θ (J · mol ^ -1 · K ^ -1): 83.7
Solubility: Easily soluble in water, insoluble in ether, slightly soluble in ethanol.
Main applications: used in manufacturing Sulfur dye, leather depilators, metal smelting, photography, rayon denitration, etc. It is widely used in leather making, paper making, mineral processing, dye production, organic intermediates, printing and dyeing, pharmaceuticals, monosodium glutamate, artificial fibers, special engineering plastics, Polyphenylene sulfide, polyalkali rubber, as well as in the production of Sodium hydrosulfide, polynenenebc sodium sulfide, Sodium thiosulfate, etc. It also has a certain use in the military industry.
?、?In the dye industry, it is used to manufacture Sulfur dye, sulfur blue, sulfur blue or dye intermediate reducing agent, mordant, etc.
?、?Used as a flotation agent for ores in the non-ferrous metallurgical industry.
?、?A depilatory agent for raw hides in the leather industry.
④ A cooking agent for paper in the papermaking industry.
?、?Sodium sulfide is also used in the manufacture of Sodium thiosulfate, Sodium sulfide, Sodium hydrosulfide and other products.
?、?It is also widely used in industrial sectors such as textiles, pigments, and rubber.
Production method:
After mixing raw material nitrate (sodium sulfate) and Anthracite in a certain proportion, calcine at high temperature to obtain Sodium sulfide alkali billet, heat dissolve to obtain Sodium sulfide semi-finished product solution, then add the prepared Sodium sulfide and Zinc sulfate solution into the main Sodium sulfide semi-finished product solution to remove impurities, precipitate the clarified Sodium sulfide solution, evaporate, concentrate, slice and package to obtain the finished product.
Stability and reactivity
Stability: weak
Prohibited substances: acids, strong oxidizing agents.
Conditions to avoid contact:--
Polymerization hazards:--
Decomposition products: hydrogen sulfide, etc.
Toxicological data
Acute toxicity: LD50: No data available
LC50: No data available
Subacute and chronic toxicity:--
Irritability: Irritating
Sensitization:--
Mutagenicity:--
Teratogenicity:--
Carcinogenicity:--
Ecological data
Ecological toxicological toxicity: It pollutes the environment.
Biodegradability:--
Non Biodegradability:--
Bioaccumulation or bioaccumulation:--
Other harmful effects: This substance is harmful to the environment.
Waste disposal
Nature of waste:--
Waste disposal method: Before disposal, relevant national and local regulations should be consulted. Dispose of using safe burial methods.
Disposal precautions:--
Transportation information
Dangerous goods number: 82011
UN Number: 1849
Packaging category: O52
Packaging method: tightly sealed in 0.5mm thick steel drums, with a net weight of no more than 100 kilograms per drum; Thread mouth glass bottles, iron cap pressure mouth glass bottles, plastic bottles or ordinary wooden boxes outside metal barrels (cans); A threaded glass bottle, plastic bottle, or tinned thin steel plate barrel (can) with a bottom plate full of checkered boxes, fiberboard boxes, or plywood boxes; Tinned thin steel drums (cans), metal drums (cans), plastic bottles or corrugated cardboard boxes with metal hoses.
Transportation precautions: During railway transportation, steel drum packaging can be transported by gondola cars. During railway transportation, it is necessary to strictly follow the dangerous goods loading table in the "Dangerous Goods Transport Rules" of the Ministry of Railways for loading. The packaging should be complete during shipment and the loading should be secure. During transportation, it is necessary to ensure that the container does not leak, collapse, fall, or be damaged. It is strictly prohibited to mix and transport with oxidants, acids, edible chemicals, etc. During transportation, transportation vehicles should be equipped with corresponding types and quantities of fire-fighting equipment and leakage emergency response equipment.
