Ammonium Pentaborate
ammonium pentaborate octahydrate
CAS: 12007-89-5;12229-12-8
Molecular Formula: B5H4NO8
Ammonium Pentaborate - Names and Identifiers
| Name | ammonium pentaborate octahydrate |
| Synonyms | AMMONIUM BORATE ammonium pentaborate ammomium pentaborate AMMONIUM PENTABORATE diammonium decaborate AMMONIUM BORATE 8 H2O Ammonium acid tetraborate AMMONIUM PENTABORATE 8-HYDRATE AMMONIUM PENTABORATE EXTRA PURE ammonium pentaborate octahydrate AMMONIUMPENTABORATE,OCTAHYDRATE,REAGENT |
| CAS | 12007-89-5 12229-12-8 |
| EINECS | 234-521-1 |
| InChI | InChI=1/5BO3.H3N/c5*2-1(3)4;/h;;;;;1H3/q5*-3;/p+1 |
Ammonium Pentaborate - Physico-chemical Properties
| Molecular Formula | B5H4NO8 |
| Molar Mass | 200.09 |
| Density | 1.567 |
| Melting Point | 175 °C |
| Solubility | Soluble in water, insoluble in alcohol. |
| Appearance | Colorless crystal |
| Color | White |
| pKa | 8.03[at 20 ℃] |
| Storage Condition | Room Temprature |
| Physical and Chemical Properties | Character: colorless orthorhombic crystal system, bi-vertebral crystal. relative density 1.567 solubility: soluble in water, insoluble in alcohol. |
| Use | For the manufacture of fire-resistant wood, fire-resistant textiles, telecommunications equipment and high-grade glass |
Ammonium Pentaborate - Risk and Safety
| Hazard Symbols | Xi - Irritant |
| Risk Codes | 36/37/38 - Irritating to eyes, respiratory system and skin. |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36 - Wear suitable protective clothing. |
| WGK Germany | 3 |
Ammonium Pentaborate - Nature
Open Data Verified Data
colorless orthorhombic double-cone crystals. The relative density was 1. 567. Soluble in water, insoluble in alcohol. It is a stable solid at 0-90 °c. When heated to more than 90 ° C, the ammonia gas is released. When heated to 150 °c, 75% of the crystal water is lost and less than 1% of the ammonia is lost. At a temperature of 200 ° C. And a pressure of 133. 322Pa, only 4.85% of the crystal water was contained. At high temperatures is converted to boron oxide with a small amount of ammonia.
Last Update：2024-01-02 23:10:35
Ammonium Pentaborate - Preparation Method
Open Data Verified Data
- carbon ammonia method: the calcined boron magnesium ore powder and ammonium bicarbonate are heated and reacted in a closed reactor, the slurry is filtered, and the filtrate is sent to a ammonia distillation tower to recover excess ammonia, ammonia distilled to ammonia boron molar ratio (NH3:B203) of 1-(2.3~2.5), then evaporated under reduced pressure (temperature does not exceed 70 ℃), cooling crystallization, centrifugal separation, the final ammonium pentaborate product was obtained by drying below 70 °c.
- double decomposition method: boric acid is put into a solution of ammonia or the like prepared with liquid ammonia, and the reaction is carried out at a boiling temperature. In order to ensure the progress of the reaction, ammonia should be appropriate excess. After all the materials were dissolved, the clear liquid was cooled, crystallized, centrifuged and dried at less than 20 ° C. To obtain a final ammonium pentaborate product.
Last Update：2022-01-01 10:58:33
Ammonium Pentaborate - Introduction
Colorless orthorhombic crystal system double vertebra crystal.
Last Update：2022-10-16 17:12:35
Ammonium Pentaborate - Use
Open Data Verified Data
It is mainly used in telecommunication equipment, metal protection, glass manufacturing, wood processing, high temperature technology, fire retardant, detergent, medicine, mining and metallurgy, textile and other industrial sectors and scientific research fields.
Last Update：2022-01-01 10:58:32
Ammonium Pentaborate - Safety
Open Data Verified Data
The capacitor grade ammonium pentaborate is packed with two layers of polyethylene plastic bag and one layer of kraft paper bag plus polypropylene woven bag. 25kg net weight per bag. Should be stored in a cool, dry warehouse. Stay away from heat sources and fire types. The package is sealed, moisture-proof, and should be protected from rain and sunlight during transportation.
Last Update：2022-01-01 10:58:33
Ammonium Pentaborate - Reference Information
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| overview | ammonium pentaborate (tetrahydrate) chemical formula NH4B5O8 · 4H2O. Colorless orthorhombic bipyramidal crystals. Soluble in water, insoluble in alcohol. It is stable at 0~90 ℃, and when heated to above 90 ℃, it decomposes and releases ammonia, which is converted into boron trioxide with a small amount of ammonia at high temperature. Ammonium pentaborate (tetrahydrate) can be made from boric acid and ammonia (or borax and ammonium chloride). |
| use | ammonium pentaborate (tetrahydrate) can be used as boron compound intermediate, telecommunication equipment, fire retardant, detergent, glass manufacturing, wood processing, high temperature technology and medicine. Such as for the preparation of boron nitrogen co-doped porous carbon materials for supercapacitors. used in the manufacture of fireproof wood, fireproof textiles, telecommunications equipment and high-grade glass used as analytical reagent |
| preparation | a co-production preparation method of ammonium tetraborate and ammonium pentaborate. the steps are as follows: 1. acid is recrystallized and purified; 2. Wean 28kg of concentrated ammonia water and put it into a stainless steel reactor; 3. Take 45kg of purified boric acid and slowly add it into ammonia water by stirring; 4. The temperature is controlled at 35±2 ℃, and the stirring speed is slow, the feeding speed should be slow; 5. After the acid is added, the solution is basically clear, and the stirring and heating are stopped; 6. The reaction kettle jacket is filled with water, cooled to 20 ℃, and stirred until a large amount of precipitation is precipitated, and the stirring is stopped and placed overnight (the temperature is controlled at 15±2 ℃);7. Take the solid precipitate, spin dry, collect the mother liquor, spin dry the solid, and dry naturally, that is, the finished ammonium tetraborate with 99% content, the yield is 85%, and other impurity items fully conform to the analytical purity (AR) specification; 8. Combine the collected mother liquor with the mother liquor left in the reaction kettle for testing. The mother liquor contains about 7% ammonium tetraborate; 9. Inject 49kg of 1:1 ammonia water into the above mother liquor and slowly add 55kg of purified boric acid under the same operating conditions as ammonium tetraborate. 10. After the boric acid is added, the reaction solution is basically clear, stop heating and stirring, the interlayer is injected with cold water to cool and stir. When the temperature is lower than 15 ℃, stop stirring, cool and leave overnight (the temperature is controlled at 12±2 ℃), and a large amount of precipitate is precipitated. 11. Take the precipitate and spin it dry. Collect the mother liquor, throw the dried solid into a dryer and dry it at 75 ℃, which is the finished ammonium pentaborate with 99% content and 90% yield. Other impurity items also fully meet the analytical purity (AR) specification. |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
Last Update：2024-04-09 02:00:06
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