Sodium sulfocyanate
Sodium sulfocyanate
CAS: 540-72-7
Molecular Formula: CNNaS
Sodium sulfocyanate - Names and Identifiers
| Name | Sodium sulfocyanate |
| Synonyms | scyan haimased usafek-t-434 natriumrhodanid Sodium rhodanate Sodium rhodanide Sodium isocyanate thiocyanatesodium Sodium thiocyanate sodium sulfocyanide SodiumThiocyanateGr Sodium sulfocyanate SodiumThiocyanateAcs SodiumThiocyanateExtraPure sodium (thioxomethylidene)azanide sodiumthiocyanatesolutionsodiumthiocyanide |
| CAS | 540-72-7 |
| EINECS | 208-754-4 |
| InChI | InChI=1/CNS.Na/c2-1-3;/q-1;+1 |
| InChIKey | VGTPCRGMBIAPIM-UHFFFAOYSA-M |
Sodium sulfocyanate - Physico-chemical Properties
| Molecular Formula | CNNaS |
| Molar Mass | 81.07 |
| Density | 1.295g/mLat 20°C |
| Melting Point | 287 °C (dec.) (lit.) |
| Water Solubility | 139 g/100 mL (21 ºC) |
| Solubility | Soluble in water, soluble in ethanol. |
| Vapor Presure | <1 hPa (20 °C) |
| Appearance | White crystal |
| Color | White |
| Odor | Odorless |
| Exposure Limit | NIOSH: IDLH 25 mg/m3 |
| Merck | 14,9327 |
| BRN | 3594965 |
| PH | 6-8 (100g/l, H2O, 20℃) |
| Storage Condition | Store at +5°C to +30°C. |
| Stability | Stable. Incompatible with acids, strong bases. May decompose on exposure to light. Contact with acid liberates highly toxic gas. |
| Sensitive | Hygroscopic |
| MDL | MFCD00011123 |
| Physical and Chemical Properties | properties white orthorhombic crystal or powder. |
| Use | It is used as a spinning solvent for polypropylene fiber, and also used in medicine, printing and dyeing, rubber, nickel plating, color film, pesticide and other industries |
Sodium sulfocyanate - Risk and Safety
| Hazard Symbols | Xn - Harmful |
| Risk Codes | R32 - Contact with acids liberates very toxic gas R52/53 - Harmful to aquatic organisms, may cause long-term adverse effects in the aquatic environment. R20/21/22 - Harmful by inhalation, in contact with skin and if swallowed. R36 - Irritating to the eyes |
| Safety Description | S36/37 - Wear suitable protective clothing and gloves. S61 - Avoid release to the environment. Refer to special instructions / safety data sheets. S13 - Keep away from food, drink and animal foodstuffs. S46 - If swallowed, seek medical advice immediately and show this container or label. S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. |
| WGK Germany | 1 |
| RTECS | XL2275000 |
| FLUKA BRAND F CODES | 3 |
| TSCA | Yes |
| HS Code | 28429011 |
| Toxicity | LD50 orally in rats: 764 mg/kg; i.v. in mice: 484 mg/kg (Anderson, Chen) |
Sodium sulfocyanate - Upstream Downstream Industry
Sodium sulfocyanate - Nature
Open Data Verified Data
white orthorhombic crystal or powder. The melting point was about 300 °c. Deliquescence in air. Sensitive to light. Soluble in water, ethanol, acetone and other solvents. The aqueous solution was neutral.
Last Update：2024-01-02 23:10:35
Sodium sulfocyanate - Preparation Method
Open Data Verified Data
sodium cyanide reacts with sulfur to form sodium thiocyanate, and then barium thiocyanate is added to remove impurities, which is obtained by filtration, evaporation and crystallization
Last Update：2022-01-01 08:51:53
Sodium sulfocyanate - Introduction
Easily soluble in water, ethanol, acetone and other solvents. The aqueous solution is neutral, and it produces blood-red iron thiocyanide with iron salt, does not react with ferrous salt, and produces yellow sodium bisulfate with concentrated sulfuric acid, and reacts with cobalt salt to produce dark blue cobalt thiocyanide, and silver salt Or copper salt reacts to produce white silver thiocyanide precipitate or black copper thiocyanide precipitate.
Last Update：2022-10-16 17:26:04
Sodium sulfocyanate - Use
Open Data Verified Data
is commonly used as a corrosion inhibitor for acid washing, and produces a synergistic effect with other components. In order to improve the efficiency of corrosion inhibition, many industrial pickling inhibitor products contain thiocyanate, and some patented pickling inhibitor formulations also have thiocyanate components. Thiocyanate also has the effect of preventing the corrosion of high-valent metal ions. During chemical cleaning, due to different corrosion mechanisms, ordinary pickling corrosion inhibitors are difficult to prevent the accelerated corrosion of high-valent metal ions on structural metals. At this time, thiocyanate can be added to the system, the high-valent metal ions are reduced to relatively harmless ions. It is also used as a polyacrylonitrile fiber spinning solvent, a chemical analysis reagent, a color film rinsing agent, a prospective plant defoliation agent, and an airport road herbicide. Sodium thiocyanate can also be used in pharmacy, printing and dyeing, rubber processing, black nickel plating and the manufacture of artificial mustard.
Last Update：2022-01-01 08:51:54
Sodium sulfocyanate - Safety
Open Data Verified Data
- operators should wear protective equipment. Sealed storage in a dry room.
- It is packed in a dry plastic drum or plywood drum lined with a polyethylene plastic bag, with a net weight of 25kg and 40kg per barrel. This product is easily deliquescent in the air and stored in a cool, dry place. Should pay attention to moisture, do not pressure, to prevent the lid and broken barrels. It is not allowed to be stored and mixed with acid and edible articles, and should be protected from rain and sunlight during transportation. Toxicity and protection: the role of cyanide is very different. No acute toxicity. Damage to the thyroid gland occurs during chronic intoxication. After taking 30g orally, acute psychosis similar to schizophrenia occurs after 4-8H. With disorientation, hallucinations and acute gastritis. Sodium thiocyanate industrial maximum allowable concentration of 50mg/m3.
Last Update：2022-01-01 08:51:54
Sodium sulfocyanate - Reference Information
| LogP | 0.58 |
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| identification test | ▼ solubility (OT-42) soluble in water, slightly soluble in ethanol 5%(W/V) aqueous solution Ph value 5.5~8.5 sodium test (IT-28) positive |
| content analysis | accurately weigh about 1.0g of sample, fix the volume with water to 100ml, and move it into a burette. Take another 250ml triangular flask, add 0.1mol/L silver nitrate 10ml, dilute nitric acid test solution (TS-158)5ml and ammonium ferric sulfate test solution (TS-99)2ml. Titrate the liquid with the sample liquid to produce pink yellow. 10ml of silver nitrate is equivalent to NaSCN84.1mg. |
| toxicity | has very different effects from cyanide. it is not highly toxic and thyroid injury occurs during chronic poisoning. After 30g of oral administration, acute psychosis similar to schizophrenia occurred after 4~8 h, accompanied by disorientation, hallucinations and acute gastritis. (The maximum allowable concentration of sodium thiocyanate industrial products is 50mg/m3)ADI deferred decision (FAO/WHO,2001); Thyroid injury may occur during chronic poisoning. |
| usage limit | GB 2760-89: the maximum usage per liter of raw milk is 2.0ml of 0.3% hydrogen peroxide plus 15.0mg of sodium thiocyanate. Can be used in Heilongjiang and Inner Mongolia. If you want to expand the use of areas, the provincial health department must report to the Ministry of Health for review and approval and implement it in accordance with the relevant implementation norms of the Ministry of Agriculture. |
| preparation | industrially prepared by azeotropic sodium cyanide and sulfur slurry, one of the coke oven gas purification products in a coking plant, and the waste liquid from anthraquinone disulfonic acid method. When desulfurization and dehydrogenation of coke oven gas is carried out by anthraquinone disulfonic acid method, the sodium carbonate in the absorption liquid absorbs hydrogen sulfide in the gas to generate sodium hydrosulfide, which reacts with hydrogen cyanide in the gas to generate sodium thiocyanate; when the absorption liquid is regenerated with compressed air in the regeneration tower, the sodium hydrosulfide is oxidized to generate sodium thiosulfate. The accumulation of these two sodium salts will affect the desulfurization and decyanation efficiency of the absorption liquid, so the waste liquid must be continuously discharged. One of the treatment methods of this waste liquid in the coking plant is to extract the salts. First, crude sodium thiosulfate is separated from the waste liquid, and then sodium thiocyanate containing two parts of crystal water is prepared. The quality requirement of the product is that the dry basis content of sodium thiocyanate is greater than 98%. The desulfurization and decyanation waste liquid without sulfur particles is sent to the evaporator by compressed air from the waste liquid tank, concentrated and filtered by a vacuum filter. The filter residue is mainly sodium carbonate, which is dissolved and sent back to the anthraquinone disulfonic acid desulfurization and decyanation device. The filtrate is put into a crystallization tank, cooled and crystallized, separated by a centrifuge, and filtered to obtain crude sodium thiosulfate. The filtrate is returned to the evaporator, and then concentrated, vacuum filtered, cooled crystallized and filtered by a centrifuge to obtain crude sodium thiocyanate, and the filtrate is returned to the evaporator for reuse. The crude sodium thiocyanate is sent to the reactor, and the solution is prepared with distilled water. First, sulfuric acid with a concentration of 93% (the addition amount is 120% of the theoretical amount) is added to decompose the complex of sodium thiosulfate and iron, and then barium salt is added to remove sulfuric acid sulfate, and finally solid sodium hydroxide is added to remove iron ions. The material after the reaction is vacuum filtered, the filtrate is put into another reactor, acetic acid is added to the pH value of 7, and activated carbon is added to decolorize. Then it is moved into another intermediate tank for vacuum filtration, and the obtained filtrate is concentrated by an evaporator, vacuum filtered, cooled in the crystallization tank, and homogenized crystal seeds are added to crystallize it. The crystallization is filtered in a centrifuge to produce a sodium thiocyanate product containing two parts of crystal water. |
| use | sodium thiocyanate can be used as polyacrylonitrile fiber spinning solvent, color film flushing agent, some plant defoliants, and airport road herbicides. it is also used in pharmaceutical, printing and dyeing, rubber treatment, black nickel plating, color movies, pesticides and other industries. It is also used as a mildew-suppressing preservative. GB 2760-The 2001 regulations are combined with hydrogen peroxide for the preservation of raw milk. It can also be used as an analytical reagent, such as the determination of niobium in steel and the determination of silver, copper, iron, and the manufacture of organic thiocyanates. |
| production method | synthesis method reacts sodium cyanide with sulfur to generate sodium thiocyanate. after impurity removal, activated carbon decolorization and filtration, the filtrate is evaporated, filtered, crystallized and separated to obtain sodium thiocyanate. Its NaCN + S → NaSCN arsenic alkali by-product method uses arsenic alkali solution to remove hydrogen sulfide from coke oven gas, generates sodium thiocyanide and sodium cyanide, which are converted into sodium thiosulfate and sodium cyanate through a regeneration tower. The above arsenic alkali liquor desulfurization waste liquid is treated with sulfuric acid, the Ph value is controlled to 4.5, arsenic sulfide is precipitated, and it is neutralized with soda ash. At this time, the content of sodium thiocyanate in the raw material liquid is 130~160g/L, and sodium thiosulfate is 250~300g/L. After vacuum evaporation, crystallization is carried out at 15~16 ℃, sodium sulfate and sodium thiosulfate are separated and removed, crude product is dissolved in water, and human sulfuric acid is added at 90~100 ℃ for 2 hours, the sodium thiosulfate is converted into sodium sulfate, filtered and removed, the filtrate is added with alkali to remove iron, and barium hydroxide to remove the remaining sodium sulfate. After the upper layer is purified, the filtrate is evaporated in vacuum and centrifuged to obtain a purity of more than 98%. Sodium thiocyanate products containing less than 0.0005% ferrous oxide (FeO). The reaction is as follows: 3Na2S2O3 + H2SO4 → 3Na2SO4 + 4S + H2OFe3 + + 3OH-→ Fe(OH)3 ↓ Na2SO4 + Ba(OH)2 → BaSO4 ↓ + 2NaOH |
Last Update：2024-04-09 19:05:12
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Raw Materials for Sodium sulfocyanate
Downstream Products for Sodium sulfocyanate