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Sodium sulfide

Sodium sulfide is also known as smelly soda and stinky base. At room temperature, the pure product is colorless or slightly purple prismatic crystal. The industrial sodium sulfide often exhibits pink, reddish brown or yellowish brown color for containing impurities. It has rotten egg smell and is corrosive and toxic.
Sodium sulfide Suppliers list
Company Name:Sino Chem Mongolia Alliance Ltd.  Gold
Products Intro: Product Name:sodiuM sulfide;sodiuM sulphide;disodiuM sulfide;Na2S
Purity:content:60% MIN;content:52%M MIN IRON:10PPM;15PPM;20PPM;30PPM;50PPM;80PPM Package:25kgs;900kgs;1000kgs PP/PE woven bags Remarks:Industry grade
Company Name:Tianjin Zhongxin Chemtech Co., Ltd.  
Products Intro: Product Name:Sodium sulfide
Purity:As required Package:25kg bag
Company Name:J & K SCIENTIFIC LTD.  
Tel:400-666-7788 +86-10-82848833;
Products Intro: Product Name:SodiuM sulfide, anhydrous
Purity:90% Package:25G,5G
Company Name:Meryer (Shanghai) Chemical Technology Co., Ltd.  
Tel:+86-(0)21-61259100(Shanghai) +86-(0)755-86170099(ShenZhen) +86-(0)10-59487313(Beijing)
Products Intro: Product Name:SodiuM sulfide, pure
Purity:90+% Remarks:31018
Company Name:Alfa Aesar  
Tel:400-610-6006; 021-67582000
Products Intro: Product Name:SodiuM sulfide, anhydrous
Package:5g Remarks:065122
Sodium sulfide Chemical Properties
mp 950 °C(lit.)
density 1.86 g/mL at 25 °C(lit.)
storage temp. Refrigerator (+4°C)
solubility H2O: 0.1 g/mL, clear, colorless
form flakes
Water Solubility 186 g/L (20 ºC)
Sensitive Hygroscopic
Merck 14,8681
Stability:Spontaneously flammable. Incompatible with acids, metals, oxidizing agents. Contact with acid liberates toxic gas. Fine dust/air mixtures are explosive. Hygroscopic.
CAS DataBase Reference1313-82-2(CAS DataBase Reference)
NIST Chemistry ReferenceSodium sulfide(1313-82-2)
EPA Substance Registry SystemSodium sulfide (Na2S)(1313-82-2)
Safety Information
Hazard Codes C,N,Xn
Risk Statements 31-34-50-22
Safety Statements 26-45-61-36/37/39
RIDADR UN 1849 8/PG 2
WGK Germany 2
RTECS WE1905000
HazardClass 4.2
PackingGroup II
Hazardous Substances Data1313-82-2(Hazardous Substances Data)
MSDS Information
Sodium sulfide English
ACROS English
SigmaAldrich English
ALFA English
Sodium sulfide Usage And Synthesis
Sodium sulfideSodium sulfide is also known as smelly soda and stinky base. At room temperature, the pure product is colorless or slightly purple prismatic crystal. The industrial sodium sulfide often exhibits pink, reddish brown or yellowish brown color for containing impurities. It has rotten egg smell and is corrosive and toxic. Its density is 2.427. It will be subject to decomposition at 920 ℃. It is soluble in cool water and easily soluble in hot water with dissolving in water almost fully being hydrolyzed into sodium hydroxide and sodium hydrosulfide (at 10 ℃, the solubility is 15.4; while the solubility is 57.2 g at 90 ℃). The aqueous water exhibits strongly alkalinity and is corrosive on copper, wood, skin, etc. It is slightly soluble in ethanol but insoluble in ether. When being encountered strong acid, the sodium sulfide will release hydrogen sulfide. It will be subject to deliquescence in air and is easily oxidized into sodium thiosulfate. Sodium sulfide is mainly used as the raw materials of hides depilatories, pulp cooking agent, and sulfur dye, the reducing agents of dye intermediates, fabric dyeing mordant, and ore flotation agent. It can also be used as viscose fiber desulfurizer and the raw material for production of sodium hydrosulfide and sodium polysulfide.
The sodium sulfide in our county was originated in the 1830s. The production of it was earliest started from a chemical plant in Dalian, Liaoning in small-scale. Upon entering into the mid-1980s to the 1990s, with the vigorous development of the international chemical industry, the domestic industry had undergone a fundamental transformation with both the number and scale of production being dramatically increased with rapid development. The production area of sodium sulfide centered in Shanxi Yuncheng has quickly expanded to a dozen of other provinces or cities including Yunnan, Xinjiang, Inner Mongolia, Gansu, Qinghai, Ningxia, and Shaanxi. The national annual production capacity has increased from the value of 420,000 tons by the end of the 80s to a value of 640,000 tons in mid-1990s. The region with the fastest growing includes Inner Mongolia, Gansu, and Xinjiang region at northwest of China. The production capacity has reached 200,000 tons in Inner Mongolia, which has become the largest production base of sodium sulfide in China.
a picture of yellow flaky sodium sulfide
Figure 1 is a picture of yellow flaky sodium sulfide
The above information is edited by the Chemicalbook of Dai Xiongfeng.
Industrial sodium sulfideIndustrial sodium sulfide is generally a mixture with different numbers of crystalline water; the molecular formula is Na2S • nH2O; it exhibits as yellow or reddish-brown massive, flaky and granular and is mainly used in paper, dyes, mineral processing, printing and dyeing industries.
GB/T 10500-2000 standard has classified the industrial sodium sulfide products into three categories: Category 1 is ordinary sodium sulfide (commonly known as red base); Class 2 is low-iron sodium sulfide (commonly known as the yellow base); Class 3 is sodium sulfide of high content.
the reference quality indicators of industrial sodium sulfide
Figure 2 the reference quality indicators of industrial sodium sulfide
Packing, storage and shipping: sodium sulfide belongs to alkaline corrosive substances, classification: GB 8.2 class, number:82011. It is packed with a tight leakproof iron drums with the net weight per barrel being 25.50 kg or 100 kg. The packaging should contain obvious "drugs" and "corrosive substance" signs. It should be stored in a dry, airy shed asbestos with the container must be intact. It can’t be stored and shipped together with acidic materials and oxidizing agents.
ToxicitySodium sulfide is strongly corrosive to the skin. Worker subjecting to contact with a solution of sodium sulfide has their hand skin get ruffling and redness. During the operation, you should note that: upon inadvertently contact with skin, you should rinse with water. After the sodium sulfide droplets or small pieces falling into eyes, immediately wash with water for 15 min and send to hospital for treatment. To protect the skin, it is recommended to wash hands with a weak acetic acid solution and then coated with oily ointment. Pay attention to the protection of eye.
Preparation of polyarylene sulfideWe can take industrial sodium sulfide and poly-halogenated aromatic compounds as raw materials; apply multi-component composite catalyst or additive and carry out segmented poly-condensation at normal pressure in high-boiling polar organic solvent (such as hempa) for generating linear high molecular weight polyarylene sulfide. The reaction conversion rate is high with the product being white granular and with excellent mechanical properties, thermal properties and thermal processing stability. Additionally supplement of a certain amount of cross-linking agent can generate higher molecular weight branched or cross-linked polyarylene sulfide.
Chemical PropertiesIt is pale yellow flakes with the main features being the iron (Fe2O3) content is lower than 30 mg / kg. See other properties in sodium sulfide.
ApplicationIt can be used for the production of high-grade sulfur dye and high-quality leather. It can be used in the production of high-grade paper production in the paper industry.
In the dye industry, it can be used for the production of sulfur dye and is the raw material of sulfur green and sulfur blue. In the printing and dyeing industry, it can be used as a facilitator agent for dissolving sulfur dye. In the tanning industry, it can be used for the hydrolysis for hair removal of raw skin and also used for the preparation of sodium polysulfide to help accelerate soaking and softening of dry skin. It can also be used as the cooking agent of papermaking industry. In fiber textile industry, it is used for the denitrofication of artificial fiber textile as well as the reduction of nitration as well as the mordant for cotton fabric dyeing. In the pharmaceutical industry, it is mainly used for the production of antipyretic drugs such as phenacetin. In addition, it can also be used for making sodium thiosulfate, sodium hydrosulfide, and sodium polysulfide.
It can be used for analysis reagents and leather depilatory
It can be used for the manufacture of dyes, sulfide, and used as ore flotation agent, depilatory rawhide, and the cooking agent of paper.
Production methodPulverized coal reduction method: put mirabilite and coal powder in a mixing ratio of 100: (21 to 22.5) (weight ratio) for calcination and reduction at 800 ~ 1100 ℃. The resultant after cooling is molten into a liquid. After standing for clarification, the upper portion of the alkaline solution was concentrated to obtain a solid sulfide. The flake (or granules)-like sodium sulfide is made through the transition tank and flaking. The reaction equation is as below:
Na2SO4 + 2C → Na2S + 2CO2
Absorption method: use 380 ~ 420 g/L sodium hydroxide solution to absorb H2S> 85% containing hydrogen sulfide waste gas; the resulting product was concentrated by evaporation to obtain sodium sulfide products. Its reaction equation is as below:
H2S + 2NaOH → Na2S + 2H2O
Barium sulfide method: use sodium sulfide and barium sulfide for cross-metathesis reaction to get precipitated barium sulfate. During this process, we can get the byproduct sodium sulfide. The reaction formula is as below:
BaS + Na2SO4 → Na2S + BaSO4 ↓
Gas reduction method: in the presence of iron catalyst, put hydrogen (or carbon monoxide, coal gas, methane gas) into boiling furnace for reaction with sodium sulfate, we can obtain high-quality anhydrous granular sodium sulfide (containing Na2S: 95% ~ 97% ). Its reaction equation is:
Na2SO4 + 4CO → Na2S + 4CO2
Na2SO4 + 4H2 → Na2S + 4H2O
Refined method using the byproduct (4% of sodium sulfide) during the production of precipitated barium sulfate as raw material, pump it into dual-effect evaporator for concentration into 23%; it further enters into the mixing tank for removing iron as well as carbon; pump it into the evaporator (manufactured by pure nickel material) to evaporate the lye into a certain concentration and further send it into the roller squeezing apparatus for flaking and further obtain the finished product after screening and packaging.
Pulverized coal reduction method is the traditional production method for making sodium sulfide. During the manufacturing process, improve the equipment and materials and increase the iron removal process so that the products can meet standards.
Categorycorrosive materials
Toxicity gradinghighly toxic
Acute toxicityoral-rat LD50: 208 mg / kg; Oral - Mouse LD50: 205 mg / kg
Hazardous characteristics of explosiveit is explosive upon heating and collision.
Flammability and hazard characteristicsit release toxic hydrogen sulfide gas upon acids; anhydrous sodium sulfide is flammable; heating can release toxic fumes of sulfur oxides
Chemical Propertiescrystals of varied colour, with a repulsive odour
Usageused in sulfur dyes, used as reductant, mordant, floatation agent, depilatory for leather, digestion auxiliary in paper-making, and used in textile, pigment and rubber
Storage characteristicsTreasury: ventilation, low-temperature and dry; store it separately from oxidants and acids
Extinguishing agentwater, sand
General DescriptionSodium sulfide is a yellow to brick red crystalline mass or fused solid with an odor of rotten eggs. If exposed to moist air Sodium sulfide is liable to spontaneous heating and may cause ignition of nearby combustible material. Sodium sulfide absorbs moisture from the air.
Air & Water ReactionsAqueous solutions of sodium sulfide when exposed to air slowly convert to sodium hydroxide and sodium thiosulfate. The crystalline form upon exposure to air forms hydrogen sulfide and sodium carbonate [Merck 11th ed. 1989].
Reactivity ProfileSODIUM SULFIDE is a white to yellow crystalline material, flammable. Can explode on rapid heating or when shocked. Violent reaction with carbon, charcoal, diazonium salts, N,N-dichloromethylamine, strong oxidizers, water. On contact with acids Sodium sulfide liberates highly toxic and flammable hydrogen sulfide gas. When heated to decomposition Sodium sulfide emits toxic fumes of sodium oxide, and oxides of sulfur [Bretherick, 5th ed., 1995, p. 1729].
Health HazardCaustic action on skin and eyes. If ingested may liberate hydrogen sulfide in stomach.
Fire HazardSpecial Hazards of Combustion Products: Irritating sulfur dioxide is produced in fire.
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