Boric anhydride
Boric anhydride
CAS: 1303-86-2
Molecular Formula: B2O3
Boric anhydride - Names and Identifiers
| Name | Boric anhydride |
| Synonyms | B-O B2O3 Boria Boric oxide BORON OXIDE Boron trioxide BORON TRIOXIDE dioxodiboroxane Boric anhydride boricoxide(b2o3) Boron oxide (B2O3) boricacid(hbo2),anhydride |
| CAS | 1303-86-2 |
| EINECS | 215-125-8 |
| InChI | InChI=1/B2O3/c3-1-5-2-4 |
| InChIKey | JKWMSGQKBLHBQQ-UHFFFAOYSA-N |
Boric anhydride - Physico-chemical Properties
| Molecular Formula | B2O3 |
| Molar Mass | 69.62 |
| Density | 2.46g/mLat 25°C(lit.) |
| Melting Point | 450°C(lit.) |
| Boling Point | 1860 °C |
| Flash Point | 1860°C |
| Water Solubility | 36 g/L (25 ºC) |
| Solubility | 36g/l |
| Vapor Presure | 1Pa |
| Vapor Density | >1 (vs air) |
| Appearance | White crystalline powder |
| Specific Gravity | 2.46 +/- 0.01 |
| Color | White |
| Odor | Odorless |
| Exposure Limit | ACGIH: TWA 10 mg/m3OSHA: TWA 15 mg/m3NIOSH: IDLH 2000 mg/m3; TWA 10 mg/m3 |
| Merck | 14,1337 |
| PH | 4 (10g/l, H2O, 25℃) |
| Storage Condition | Inert atmosphere,Room Temperature |
| Stability | Stable. Moisture sensitive. Incompatible with water. |
| Sensitive | Hygroscopic |
| MDL | MFCD00011315 |
| Physical and Chemical Properties | Properties of colorless glass-like crystals or powder. The surface is greasy and tasteless. relative density 2.46 solubility soluble in acid, ethanol, hot water, slightly soluble in cold water. |
| Use | Used as a flux, also used in glass, enamel, manufacturing boron compound raw materials and color TV industry It can be used as the doping source of semiconductor silicon and the flux in the decomposition of silicate, and can also be used in the manufacture of boron |
Boric anhydride - Risk and Safety
| Risk Codes | R36/37/38 - Irritating to eyes, respiratory system and skin. R61 - May cause harm to the unborn child R60 - May impair fertility |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S37/39 - Wear suitable gloves and eye/face protection S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) S53 - Avoid exposure - obtain special instructions before use. |
| WGK Germany | 1 |
| RTECS | ED7900000 |
| FLUKA BRAND F CODES | 3-10 |
| TSCA | Yes |
| HS Code | 28100010 |
| Toxicity | LD50 orally in Rabbit: 3150 mg/kg |
Boric anhydride - Upstream Downstream Industry
| Raw Materials | Orthoboric acid |
Boric anhydride - Reference
| Reference Show more | 1. [IF=13.273] Xin Ji et al."Developing visible light responsive Z-scheme BN-PDI photocatalysts with good degradation performance for antibiotics."Chem Eng J. 2021 Dec;425:131260 2. [IF=10.588] Yong Guo et al."UV-light promoted formation of boron nitride-fullerene composite and its photodegradation performance for antibiotics under visible light irradiation."J Hazard Mater. 2021 May;410:124628 3. [IF=3.591] Congcong Yan et al."Improved photoremoval performance of boron carbon nitride–pyromellitic dianhydride composite toward tetracycline and Cr(VI) by itself to change the solution pH."New J Chem. 2020 Jul;44(26):11105-11124 4. [IF=5.268] Bo Jiang et al."Precursor structure-determined fluorescence labeling for mesenchymal stem cells among four polyethylenimine-based carbon quantum dots."Colloid Surface B. 2022 May;213:112411 |
Boric anhydride - Nature
Open Data Verified Data
colorless glassy crystals or powders. The appearance of the product prepared by the atmospheric pressure method and the vacuum method is different, the former is a tough solid, and the latter is a porous solid. The surface is greasy and tasteless. The relative density was 2. 46. Soluble in acid, ethanol, hot water, slightly soluble in cold water. It is stable to heat and is not reduced by carbon in the case of White Heat, but alkali metals, magnesium and aluminum can be reduced to elemental boron. When heated to 600 °c, it becomes a highly viscous liquid. In the air can strongly absorb water, generation of boric acid. Several metal oxides can be combined to form a boron glass with a characteristic color that is fully miscible with oxides of alkali metals, copper, silver, aluminum, arsenic, antimony, bismuth.
Last Update：2024-01-02 23:10:35
Boric anhydride - Preparation Method
Open Data Verified Data
boron oxide can be prepared by boric acid dehydration or ammonium pentaborate heating decomposition, and boric acid dehydration methods are divided into normal pressure heating dehydration, vacuum dehydration, hot gas flow heating and boiling bed dehydration.
- normal pressure method: boric acid was fed into the heating kettle, and the temperature was raised, and the boric acid was gradually dehydrated. It becomes metaboric acid (HB02) when the temperature is increased to 107.5 °c. When the temperature rises to 15 0~160 ℃, it changes to tetraboronic acid (H2 84 07). A large amount of foam is generated in the melt above 650 ° C., and finally the temperature is maintained at 800 to 1000 ° C., and the burning is dehydrated until the material is red and no longer bubbled. The relative density of the melt was 1. 52. At this time, the wire drawing machine was started and the temperature was controlled at 700-900 °c. Then, the boron oxide wire on the wire drawing machine is cut off with a back cutting machine and packaged to obtain a finished boron oxide product.
- vacuum method: boric acid was placed in a stainless steel pan, baked in an oven for 1. 5H, then heated to 150 °c for 4H. The heating process should be often turned over, so that the dehydration is uniform. The mass was then removed, cooled, pulverized, then placed in a vacuum oven, kept sealed, heated at 220 °c for 1. 5H, then warmed to 260 °c and heated for 4H. Then, the material was cooled, pulverized, put into a tube furnace, heated at 280 ° C., and dehydrated under vacuum for 4H to obtain a boron oxide product.
Last Update：2022-01-01 09:01:05
Boric anhydride - Introduction
Hard and crisp, slightly bitter, hygroscopic. Soluble in alcohol and glycerin, slowly dissolve in 30 parts of cold water or 5 parts of boiling water. It's irritating.
Last Update：2022-10-16 17:13:09
Boric anhydride - Use
Open Data Verified Data
- silica and base were detected in boron trioxide for silicate analysis. It is also used as a doping source for semiconductors, as a flux in the decomposition of silicates, and in the preparation of boron.
- It is used as a flux in the decomposition of silicates, a dopant for semiconductor materials, a refractory additive for heat-resistant Glassware and paint. It is a raw material for the preparation of elemental boron and various boron compounds. In the metallurgical industry for the production of alloy steel. It can be used as a catalyst for organic synthesis, an additive for a lubricant for high temperature use, a chemical reagent, and the like.
Last Update：2022-01-01 09:01:05
Boric anhydride - Safety
Open Data Verified Data
- toxic l mouse oral LDsa:3163mg/kg. Can stimulate the nose, eyes and skin, cause conjunctivitis, rash. Staff should be well protected, if accidentally touch the skin and eyes, should immediately rinse with plenty of water. Store in a cool, ventilated warehouse. Keep away from fire and heat source. Should be stored separately from the acid, not mixed storage.
- packed in a polyethylene plastic barrel lined with a two-layer polyethylene plastic bag. 25kg net weight per barrel. The package should have a "check to prevent moisture knife signs. Store in a ventilated, dry warehouse. Each layer of polyethylene plastic bag should be tightly tied, and the polyethylene plastic barrel should be covered tightly. Storage and transportation should be strictly moisture-proof, anti-rain, not with acid contact. When there is a fire, it can be suppressed by sand and carbon dioxide fire. The animal experiment shows that the toxicity of boron oxide is low, so the allowable concentration of boron oxide is 10 mg/m3, which is the same as that of other general dust with low toxicity.
Last Update：2022-01-01 09:01:06
Boric anhydride - Reference Information
| NIST chemical information | Information provided by: webbook.nist.gov (external link) |
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| Overview | Boron oxide is also called "boric anhydride". Chemical formula B2O3, soluble in hot water, only slightly hot in cold water. Formation of orthoboric acid in water. The volatile metaboric acid is formed in hot water vapor. In the molten state, a variety of metal oxides can be dissolved to obtain colored boron glass. Alkali metals, magnesium and aluminum can reduce it to elemental boron. In order to obtain high purity boron oxide, high purity boric acid must be prepared first. The preparation methods of high purity boric acid mainly include recrystallization method, ion exchange method, complexation method, esterification-hydrolysis method, membrane separation method, electrochemical method, adsorption method, etc. |
| properties | high purity boron trioxide generally has two appearances, one is glassy fragments and the other is white powder. Boromagnesite is the raw material for extracting boron. The boron trioxide content of boron-magnesite generally ranges from 3% to 30%. When the boron trioxide content in boron-magnesite is 15%-30%, this ore is suitable as a raw material for producing boric acid, and other grades of boron-magnesite are suitable for producing boron and boride raw materials. |
| application | boron oxide can be widely used as a flux during silicate decomposition, a dopant for semiconductor materials, an acidic catalyst in organic synthesis, a refractory additive for paints, and a raw material for preparing elemental boron and various borides, high purity boron oxide (≥ 99.999%) is a liquid sealing agent for manufacturing III ~ V compound semiconductors (such as gallium arsenide, gallium phosphide, indium arsenide). In recent years, with the rapid development of LED industry, the output of its substrate material gallium arsenide is increasing, and the demand for high purity boron oxide is also increasing. |
| Preparation | Step 1: Preparation of high purity boric acid 1) Recrystallization. Put 360g of industrial boric acid into a 2000mL reaction bottle, add 1400mL of pure water, heat, stir and dissolve, and then add 3% (mass fraction) of hydrogen peroxide. Reaction reflux for 1h, filtering while hot, cooling crystallization, filtering, drying the material at 60 ℃. 2) Esterified boric acid. 180g of recrystallized industrial boric acid was placed in a 2000mL reaction bottle, 1500mL of anhydrous methanol (the molar ratio is 1: 12) and a few drops of acetic acid were added respectively, heated while stirring, and refluxed at constant temperature for 1h. The temperature is controlled to evaporate the azeotrope with methyl borate as the main component, and the azeotrope with distillation temperature of 40~60 ℃ is collected. When the steam temperature reaches above 60 ℃, replace the receiving bottle, recover methanol, stop heating when a small amount of solid appears in the bottle, cool the bottom liquid of the bottle, filter and recover boric acid. 3) Hydrolysis of boric acid esterification. The azeotrope at 40~60 ℃ is put into a flask, then high purity water accounting for the volume 80% of the azeotrope is added, hydrolyzed and refluxed for 1h, and methanol is distilled. Cooling crystallization, filtration, drying to obtain high purity boric acid. Step 2: Boron oxide calcination The high-purity boric acid is placed in a platinum crucible, calcined at 200°C for 0.5h, calcined at 900°C for 1h, and calcined at 800°C for 1h, and quickly removed after cooling with the furnace under vacuum, vacuum packaging. |
| solubility in water (g/100ml) | dissolved grams per 100ml of water: 2.2g/20 ℃ |
| use | used to make elemental boron and fine boron compounds, manufacture boron glass, optical glass, heat-resistant glass and glass fiber, etc., and also used as paint flame retardant and desiccant used as flux during silicate decomposition, dopant for semiconductor materials, heat-resistant glassware and paint fire-resistant additives. It is the raw material for the preparation of elemental boron and various boron compounds. It is used in the production of alloy steel in the metallurgical industry. It can be used as a catalyst for organic synthesis, an additive for high-temperature lubricants, and chemical reagents. used as a flux, also used in glass, enamel, boron compound manufacturing raw materials and color TV industry as semiconductor silicon doping source and silicate decomposition flux, also can be used in boron manufacturing metallurgy, determination of silica and alkali in silicate analysis. Blow pipe analysis. Flux for decomposing silicates. |
| production method | boric acid is sent to the heating kettle by normal pressure method, the temperature is increased, and the boric acid is slowly dehydrated. When the temperature rises to 107.5 ℃, it becomes metaboric acid (HBO2), and when the temperature rises to 150~160 ℃, it becomes tetraboric acid (H2B4O7). Above 650 ℃, the melt produces a large amount of foam, and finally the temperature is kept at 800~1000 ℃, and the burning and dehydration until the material is red and no longer bubbling. The relative density of the melt is 1.52. At this time, the shredder is turned on for shredding, and the temperature is controlled at 700~900 ℃. Then the boron oxide wire on the wire drawing machine is cut and packaged with a cutting machine to obtain the finished boron oxide product. The 2H3BO3 → B2O3 3H2O vacuum method places boric acid in a stainless steel plate, bakes it in an oven for 1.5 h, then heats it to 150 ℃ for 4 h. During the heating process, it should be turned over frequently to make it dehydrate evenly. Then the material is removed, cooled, crushed, then placed in a vacuum oven, kept sealed, heated at 220 ℃ for 1.5 h, then heated to 260 ℃, and heated for 4 h. Then the material is cooled and crushed, put into a tube furnace, the heating temperature is controlled at 280 ℃, and dehydrated under vacuum for 4 hours to obtain boron oxide product. Its 2H3BO3 → B2O3 3H2O |
| category | pesticide |
| toxicity classification | poisoning |
| acute toxicity | oral administration-mouse LD50: 3163 mg/kg; Abdominal cavity-mouse LD50: 1868 mg/kg |
| stimulation data | skin-rabbit 1000 mg; Eye-Rabbit 50 mg |
| flammability hazard characteristics | mixed with calcium oxide, or directly put into lime milk, the mixture heats up to incandescence |
| storage and transportation characteristics | warehouse ventilation and low temperature drying; separate from lime |
| fire extinguishing agent | water, dry powder, carbon dioxide |
| occupational standard | TWA 10 mg/m3 (dust); TWA 10 mg/m3 |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
| immediate life-threatening and health concentration | 2,000 mg/m3 |
Last Update：2024-04-10 22:29:15
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Raw Materials for Boric anhydride