SILICA STANDARD
Sodium metasilicate
CAS: 6834-92-0
Molecular Formula: Na2O3Si
SILICA STANDARD - Names and Identifiers
| Name | Sodium metasilicate |
| Synonyms | WATER GLASS SILICA STANDARD SODIUM-M-SILICATE Sodium metasilicate SODIUM METASILICATE SODIUM SILICATE, META disodium metasilicate SODIUM SESQUISILICATE DISODIUM TRIOXOSILICATE Sodium Metasilicate Anhydrous SODIUM METASILICATE N-HYDRATE |
| CAS | 6834-92-0 |
| EINECS | 215-687-4 |
| InChI | InChI=1/2Na.HO3Si/c;;1-4(2)3/h;;4H/q2*+1;-2 |
| InChIKey | NTHWMYGWWRZVTN-UHFFFAOYSA-N |
SILICA STANDARD - Physico-chemical Properties
| Molecular Formula | Na2O3Si |
| Molar Mass | 122.06 |
| Density | 2.4 |
| Melting Point | 1089°C |
| Water Solubility | Soluble in cold water. Hydrolyzes in hot water. Insoluble in acids, alcohol and salt solutions. |
| Appearance | powder |
| Specific Gravity | 2.61 |
| Color | White |
| Merck | 14,8642 |
| PH | 11(1 mM solution);11.91(10 mM solution);12.62(100 mM solution) |
| Stability | hygroscopic |
| Sensitive | 0: forms stable aqueous solutions |
| Refractive Index | nD25 (glass) 1.520 |
| Physical and Chemical Properties | Character white square crystal. melting point 40~48 ℃ relative density 0.7~0.9 solubility: soluble in water and dilute alkali, insoluble in alcohol and acid. The aqueous solution is alkaline. |
| Use | Used in textile, electroplating, packing and catalyst |
SILICA STANDARD - Risk and Safety
| Hazard Symbols | C - Corrosive |
| Risk Codes | R36/37/38 - Irritating to eyes, respiratory system and skin. R37 - Irritating to the respiratory system R34 - Causes burns |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. S13 - Keep away from food, drink and animal foodstuffs. S24/25 - Avoid contact with skin and eyes. |
| UN IDs | UN 3253 8/PG 3 |
| WGK Germany | 1 |
| RTECS | VV9275000 |
| FLUKA BRAND F CODES | 3 |
| TSCA | Yes |
| HS Code | 28391910 |
| Hazard Class | 8 |
| Packing Group | III |
SILICA STANDARD - Upstream Downstream Industry
| Raw Materials | Sodium silicate Sodium hydroxide |
SILICA STANDARD - Reference Information
| NIST chemical information | information provided by: webbook.nist.gov (external link) |
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Overview | sodium metasilicate is a salt of silicic acid, belonging to inorganic salt products, molecular formula Na2SiO3 · nH2O, is a non-toxic, tasteless, pollution-free white powder or crystalline particles, soluble in water, insoluble in alcohol and acid, aqueous solution is alkaline, easily hygroscopic deliquescence in the air, with descaling, emulsification, dispersion, wet, permeability and pH buffer capacity, by the state as "China's priority development of fine chemicals" and "future development of inorganic chemical products in China one of the priorities. Sodium metasilicate is a low molecular weight Crystal prepared by the hydrothermal reaction of ordinary bubbling alkali and caustic soda. There are anhydrous, pentahydrate and nonahydrate, among which nonahydrate exists only in China's market, it is an emergency product with low technical content that was developed in an urgent need of sodium metasilicate in the Eighties of the last century. Because its melting point is only 42 ℃, when it is 30~40 ℃, it will release crystal water, to the use of inconvenience, storage is easy to become liquid or paste, is gradually being eliminated, but due to some user habits and some areas of crystal water is not very concerned about, nine sodium metasilicate still has a certain market. in the inorganic electrolyte, sodium metasilicate has the highest active alkalinity and PH buffer index, and has strong wetting, emulsification and saponification of oil, dispersion and suspension of dirt has excellent performance, and can prevent the re-deposition of dirt, Strong decontamination capacity, large buffer capacity, can neutralize acidic dirt, fat and oil emulsification, anti-flocculation effect on inorganic matter, anti-corrosion effect on metal, it can be used instead of sodium tripolyphosphate in the synthesis of efficient detergents and metal cleaning agents to reduce the pollution of sodium tripolyphosphate to the environment. The application of sodium metasilicate in detergents has a history of more than 40 years abroad, and the application technology is relatively mature. There are also more than 20 years of domestic application to detergents and other industries, is a mature chemical products, but also has a mature and broad market. Sodium metasilicate has a large number of applications in detergent, ceramic, electroplating, textile, printing and dyeing, paper making, cement, concrete, refractory materials, oil and leather processing and other industrial fields. At present, the industry order of large amount of application is: ceramics, industrial cleaning, detergent, concrete, printing and dyeing, paper making, cement, oil mining, other. |
| uses | sodium metasilicate is widely used in various types of washing industry. In the washing industry, such as super concentrated detergent, laundry detergent, laundry cream, dry cleaning agent, fiber bleach, fabric bleach, etc., also a large number of used for metal surface cleaning agent, beer bottle, aerosol detergent, after fully dissolved, it can be used as metal rust inhibitor, scale cleaning agent and electric device cleaning agent, and can be used as food industry detergent. It can also be used as mud consistency regulator and mud coagulant in crude oil and natural drilling and excavation engineering; in the construction industry, it is used as a coagulant for preparing acid-resistant mortar, acid-resistant commercial concrete and cement; In the paper industry, it can be used as an adhesive, an ink agent, and a paper surface treatment agent; in the textile industry as a printing and dyeing auxiliaries, fabric pre-treatment agent; Can also be used as soap filler, detergent, egg preservative, and vegetation molecular sieve, silicic acid and fire materials. Sodium metasilicate has lubricity, can be used for the production of ceramic body mud; With strong alkalinity, strong decontamination ability, large buffer capacity, can neutralize acidic dirt. Emulsification of fat and oil, has anti-flocculation effect on inorganic substances, has anti-corrosion effect on metals, so it is one of the main components of super concentrated detergent powder, and is also used in dishwashing detergent, food industry detergent, metal detergent and waste paper deinking. |
| identification test | take a sample of 200mg and dissolve it in 10ml of water, drop it one drop on the color plate, add 1 drop of 4mol/L sodium hydroxide and 1 drop of solution from 0.5g ammonium molybdate dissolved in 10ml of water, plus 3ml of sulfuric acid, should appear dark yellow, to show the presence of silicate. A nickel-chromium alloy (nichrome) wire was dipped into the sample solution in Test 1, and the flame was extended. A bright yellow color should appear, indicating the presence of sodium. |
| content analysis | The silica sample 1G was weighed correctly, placed in a beaker and acidified with 5ml hydrochloric acid, evaporate to dryness on a steam bath, add another 5ml of hydrochloric acid, repeat once, mix the residue with 1ml of hydrochloric acid and 2ml of water, hydrolyze to soluble salts on a steam bath, filter with ashless filter paper, after washing with hot water, a platinum crucible was transferred, dried at 105 °c for 1H, and carbonized at a lower temperature. It was then burned to constant weight at 1000 °c. The residue was wetted with a few drops of water, 15ml of hydrofluoric acid and 5 drops of 1:3 sulfuric acid were added, the acid was removed on a hot plate and then burned at 1000 ° C. To constant weight. Sodium oxide accurately weigh sample 500mg, dispersed in 150ml of water, heated to all dissolved. Phenolphthalein solution (TS-167)2-3 drops and 0.1mol/L sulfuric acid 100.0. Drop to pink with 0.1mol/L sodium hydroxide, minus 0.1mol/L sulfuric acid phase per ml |
| toxic | is corrosive and cannot come into contact with eyes, skin, clothing, or inhale its vapor. GRAS(GMP;FDA,§ 184.1769a,2000). |
| Use limit | no restriction (GMP;FI)A,§ 184.1769a,2000). |
| production method | 1. Sodium carbonate (or sodium hydroxide) was mixed with silica sand in a molar ratio of Na2O/SiO2 = 1:3, melted in a platinum crucible, and dissolved in water to form an aqueous solution of sodium silicate. A calculated amount of sodium hydroxide was added to the solution so that the molar ratio of Na2O/SiO2 in the solution was 1:1. The resulting solution of Na2O/SiO2 composition was heated to several tens of degrees, concentrated, and cooled to 30 ° C. To obtain a nonahydrate, which was heated to obtain an anhydrous product. Dry methods include soda ash method, sodium sulfate (mirabilite) method and trona method. Soda ash method: the soda ash and silica sand are mixed evenly according to a certain proportion, and the melting reaction is carried out at 1400~1500 ℃. The melt is quenched and cooled by water to form glass frit, which is put into the dissolution tank while it is hot, then steam is introduced for heating, and water glass is prepared by sedimentation and concentration. The reaction scheme is as follows. Sodium sulfate method: First sodium sulfate (Glauber's salt) and coal powder are mixed evenly, then Silica sand is added, after mixing evenly, it is quickly added to the furnace for reaction, after the reaction is completed, the product is cooled, crushed, dissolved, precipitation, concentration, preparation of water glass. The reaction scheme is as follows. Trona Method: Mix Trona, silica sand and pulverized coal in a certain proportion, then add the adjustment role of caustic soda slag, the mixture is preheated by the top of the furnace for 2~4H and then put into the furnace for reaction, after 3~5h, a melt is generated, and the glass frit formed by cooling is dissolved, precipitated and concentrated to obtain water glass by quenching the discharge water. The reaction scheme is as follows. 3. The liquid caustic soda and silica sand are mixed into the autoclave in proper proportion by wet method, and heated by direct steam. After the pressure in the reactor rises to 0.7-0.8MPa, the direct steam is stopped, the pressure was maintained by a jacketed steam incubation, and the reaction was carried out for several hours. The reaction mixture was filtered and concentrated to obtain a water glass. The reaction scheme is as follows. 4. The sodium hydroxide solution is added to the silica sand according to the theoretical amount, heated and stirred until dissolved, and the reaction is maintained for several hours: After the reaction is finished, filtration is performed. After the filtrate was concentrated, the crystals were cooled to about 30 ° C., and the separated crystals were washed with ethanol and dried. 5. Add 13% ~ 14% sodium hydroxide solution to water glass containing 30.85% silica and 14.34% sodium oxide, stir and filter to make the filtrate completely transparent, and then add a small amount of sodium silicate nonhydrate seed crystal to the filtrate, stand still. The crystals were filtered with suction, washed with ethanol and dried. |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
Last Update：2024-04-09 15:16:52
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Raw Materials for SILICA STANDARD