Phosphorus trihydroxide
Phosphorous acid
CAS: 13598-36-2
Molecular Formula: H3O3P
Phosphorus trihydroxide - Names and Identifiers
| Name | Phosphorous acid |
| Synonyms | Phosphonsure AURORA KA-1076 Phosphonic acid Orthophosphorus Phosphorous acid Trihydroxyphosphine hydrogen phosphonate Orthophosphorous acid phosphorustrihydroxide PHOSPHOROUSACID,REAGENT Phosphorus trihydroxide phosphorus(+3) trihydride cation trihydroxide |
| CAS | 13598-36-2 |
| EINECS | 237-066-7 |
| InChI | InChI=1/3H2O.H3P/h3*1H2;1H3/q;;;+3/p-3 |
Phosphorus trihydroxide - Physico-chemical Properties
| Molecular Formula | H3O3P |
| Molar Mass | 82 |
| Density | 1.651g/mLat 25°C(lit.) |
| Melting Point | 73 °C |
| Boling Point | 200 °C |
| Flash Point | 200°C |
| Water Solubility | SOLUBLE |
| Vapor Presure | 0.001Pa at 20℃ |
| Appearance | Crystals |
| Specific Gravity | 1.651 |
| Color | White |
| Merck | 14,7346 |
| pKa | pK1 1.29; pK2 6.74(at 25℃) |
| Storage Condition | 0-6°C |
| Stability | Stable. Incompatible with strong bases. Hygroscopic. |
| Sensitive | Air Sensitive & Hygroscopic |
| Physical and Chemical Properties | Colorless crystals. |
| Use | Used as a reducing agent, nylon whitening agent, also used as phosphite raw materials, pesticide intermediates |
Phosphorus trihydroxide - Risk and Safety
| Hazard Symbols | C - Corrosive |
| Risk Codes | R22 - Harmful if swallowed R35 - Causes severe burns |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) |
| UN IDs | UN 2834 8/PG 3 |
| WGK Germany | 1 |
| RTECS | SZ6400000 |
| FLUKA BRAND F CODES | 3 |
| TSCA | Yes |
| HS Code | 28092019 |
| Hazard Class | 8 |
| Packing Group | III |
Phosphorus trihydroxide - Upstream Downstream Industry
| Raw Materials | Phosphorus trichloride |
| Downstream Products | phosphine Glyphosate Lead phosphite,dibasic 2-Hydroxyphosphonoacetic Acid Diethylenetriaminepenta(methylenephosphonic) acid |
Phosphorus trihydroxide - Nature
Open Data Verified Data
colorless crystals. The relative density of 1.651(21.2 deg C). Melting Point 73,6. Boiling point 200 degrees C (decomposition). Soluble in water and alcohol. In the air slowly oxidized to orthophosphoric acid, heated to 180 deg C when the decomposition of orthophosphoric acid and phosphine (highly toxic). Phosphorous acid is a dibasic acid, and its acidity is slightly stronger than that of phosphoric acid. It has strong reducibility, easily reduces Ag ions to metal silver, and can reduce sulfuric acid to sulfur dioxide. Strong hygroscopicity and deliquescence, corrosive.
Last Update：2024-01-02 23:10:35
Phosphorus trihydroxide - Preparation Method
Open Data Verified Data
The industrial production methods include the hydrolysis of phosphorus trichloride and The phosphite method.
Hydrolysis method: phosphorus trichloride is slowly added with water under stirring for hydrolysis reaction to generate phosphorous acid, which is refined, cooled, crystallized and decolorized to obtain phosphorous acid product. The hydrogen chloride produced in the production process is recycled and can be made into hydrochloric acid.
Last Update：2022-01-01 11:02:32
Phosphorus trihydroxide - Use
Open Data Verified Data
is the raw material for the manufacture of phosphite, and is also the raw material for the manufacture of plastic stabilizers (such as: dibasic lead phosphite) and organophosphorus pesticides. Used as a stabilizer for polycarbonate. Also used as an antioxidant for nylon 1010.
Last Update：2022-01-01 11:02:32
Phosphorus trihydroxide - Safety
Open Data Verified Data
is a Class II inorganic acid corrosion articles, risk code: GB 8.1 class 81520. UNN0.2854; IMDG CODE page 8205, class 8.1. Should be stored in a cool, ventilated, dry warehouse. The package is sealed, and it is strictly prohibited to be subjected to moisture and inverted, and it is not allowed to be stored and transported together with alkali substances, toxic substances, H porogen and other easily corrosive substances. Transport should be protected from rain and sunlight; Marine transport should not be placed on the deck. When loading and unloading should be light, not roll and inverted, to prevent damage to the package. Three-ply drum for export packaging, lined with two layers of polyethylene plastic bags, each net weight 50kg. Polyethylene plastic drum for domestic packaging, 30kg net weight per barrel. Or an iron drum lined with two layers of polyethylene plastic bags, each net weight 25kg. The package shall be marked with "corrosive items. When fire occurs, sand and dry powder can be used to kill
Firearm suppression. Toxicity and protection: see industrial phosphoric acid.
Last Update：2022-01-01 11:02:33
Phosphorus trihydroxide - 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) |
| toxicity | see industrial phosphoric acid. |
| Use | used as a reducing agent, nylon whitening agent, also used as phosphite raw materials, pesticide intermediates is the raw material for the manufacture of phosphite, it is also a raw material for the manufacture of plastic stabilizers (such as: dibasic lead phosphite) and organophosphorus pesticides. Used as a stabilizer for polycarbonate. Also used as an antioxidant for nylon 1010. used as chemical reagent Water Treatment determination of mercury, gold, silver and lead, reducing agent, determination of iodic acid, copper and cadmium. Industrial phosphorous acid is a raw material for the manufacture of stabilizers for plastics. It is also used in the manufacture of synthetic fibers and phosphites. |
| production method | industrial production methods include phosphorus trichloride hydrolysis method and phosphite method. Phosphorus trichloride is hydrolyzed by slowly adding water Dropwise with stirring to produce phosphorous acid, which is refined, cooled, crystallized and decolorized to obtain phosphorous acid product. The hydrogen chloride produced in the production process of PCI3 3H2O → H3PO3 3HCl is recycled and can be made into hydrochloric acid. |
| category | corrosive article |
| toxicity grade | poisoning |
| Acute toxicity | oral-rat LD50: 1895 mg/kg; Oral-mouse LD50: 2172 mg/kg |
| flammability hazard characteristics | combustible pore forming agent in case of H; thermal decomposition of toxic phosphorus oxide smoke |
| storage and transportation characteristics | The warehouse is ventilated and dried at low temperature; It is stored separately from H pore forming agent and alkali. |
| fire extinguishing agent | Sand, foam, water mist, carbon dioxide |
Last Update：2024-04-09 02:00:04
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View History
Raw Materials for Phosphorus trihydroxide
Downstream Products for Phosphorus trihydroxide
phosphine
Glyphosate
Lead phosphite,dibasic
2-Hydroxyphosphonoacetic Acid
Diethylenetriaminepenta(methylenephosphonic) acid
Glyphosate
Lead phosphite,dibasic
2-Hydroxyphosphonoacetic Acid
Diethylenetriaminepenta(methylenephosphonic) acid