Molecular Formula | H6NO4P |
Molar Mass | 115.03 |
Density | 1.02g/mLat 20°C |
Melting Point | 190 °C (dec.) (lit.) |
Boling Point | 87.4 °C |
Water Solubility | 368 g/L (20 ºC) |
Solubility | H2O: 0.1M at20°C, clear, colorless |
Vapor Presure | 0.066 hPa (125 °C) |
Appearance | Crystalline powder |
Specific Gravity | 1.803 |
Color | White or colorless |
Maximum wavelength(λmax) | ['λ: 260 nm Amax: ≤0.059', , 'λ: 280 nm Amax: ≤0.050'] |
Merck | 14,543 |
PH | 3.8-4.4 (25℃, 50mg/mL in H2O) |
Storage Condition | Inert atmosphere,Room Temperature |
Sensitive | Easily absorbing moisture |
MDL | MFCD00003396 |
Physical and Chemical Properties | melting point 190°C (dec.)(lit.) |
Use | It can be used as a flame retardant for wood, paper and fabric, a dispersant for fiber processing and dye industry, a compounding agent for fire-retardant coatings, a dry powder extinguishing agent, etc. |
Hazard Symbols | Xi - Irritant |
Risk Codes | 36/37/38 - Irritating to eyes, respiratory system and skin. |
Safety Description | S24/25 - Avoid contact with skin and eyes. S36 - Wear suitable protective clothing. S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. |
UN IDs | UN3264 |
WGK Germany | 1 |
RTECS | TC6587000 |
TSCA | Yes |
HS Code | 31054000 |
Hazard Class | 8 |
Packing Group | III |
Toxicity | LD50 orally in Rabbit: 5750 mg/kg LD50 dermal Rabbit > 7940 mg/kg |
Raw Materials | Phosphoric acid Ammonia |
Reference Show more | 1. Changxiaojie. Study on the content of phenolic compounds, organic acids, triterpene acids, VC and antioxidant activity of jujube with different maturity [J]. Preservation and processing, 2021,21(02):28-32. 2. Liu, SS., yang, K., sun, ZL. et al. A novel two-dimensional liquid chromatography system for the simultaneous determination of three monoterpene inkaloids in biological matrices. Anal Bioanal Chem 3857, 1-3870 (2019). https://doi.org/10.1007/s0021 |
ammonium dihydrogen phosphate is a colorless and transparent tetragonal coarse or fine crystal. Relative density (19 ℃)1. 803, melting point 150 ℃. Soluble in water, slightly soluble in alcohol, insoluble in ketone. Stable in air, heating to 100~110 ° C will not lose ammonia; Heating to 130 ° C or more began to decompose, and gradually release ammonia and water, forming a mixture of ammonium phosphate and phosphoric acid. The aqueous solution is acidic and the pH of the 1% solution is 4.5.
after 85% of the thermal phosphoric acid was appropriately diluted, it was introduced into a winn's tubular gas flow mixing reactor, and ammonia gas was further introduced for mixing reaction, followed by filtration after completion of the reaction. The filtrate is cooled to below 26 ° C. In a cooling crystallizer, crystallized, separated, dehydrated and dried to obtain a finished product. Alternatively, dilute phosphoric acid diluted to so%~ ss% is metered into an enamel kettle with a stirrer and a jacket, and ammonia gas is slowly introduced into the ammonia distributor to carry out neutralization reaction under stirring, after completion of the reaction, cooling crystallization was carried out, and after separation and dehydration and drying, a final ammonium dihydrogen phosphate product was obtained. It is also possible to prepare solutions of Calcium dihydrogen phosphate and ammonium sulfate, respectively, at concentrations below saturation. The Calcium dihydrogen phosphate solution was added to the reactor, and the temperature was raised to above 95 ° C. By steam under stirring, and then the ammonium sulfate solution was slowly added to perform the metathesis reaction to generate phosphoric acid = ammonium hydrogen and calcium sulfate. The reaction solution was filtered, and the resulting solution was sent to the evaporator to evaporate to the boiling point, and then put into the cooling crystallizer to cool to 40 ° C. Or less to precipitate crystals, and then centrifuged and dried to obtain ammonium dihydrogen phosphate.
In circulating water and boiler water treatment, can be used as an anode corrosion inhibitor, ammonium dihydrogen phosphate and chromate, can form a layer of very hard protective film on the metal surface. In the biochemical treatment of water, ammonium dihydrogen phosphate can be used as a biological Culture agent
phosphoric acid vapor can cause atrophy of nasal mucosa. I it has a strong corrosive effect on skin, can cause skin inflammatory diseases, and can cause systemic poisoning. The maximum allowable concentration in air is 1mg/m3. Production personnel should wear protective equipment, such as work clothes, rubber gloves, rubber or plastic aprons, long plastic boots. Pay attention to the protection of respiratory organs and skin, such as accidentally spattering to the skin, should be immediately washed with plenty of water, phosphoric acid after washing, generally available red mercury solution or gentian violet solution smeared on the affected area, serious should be immediately sent to the hospital for diagnosis and treatment.
Phosphoric acid with polyethylene plastic barrel or steel plastic barrel, the barrel must be added to the inner cover and outer cover close. Net content per barrel 25kg, 30kg, 35kg, 200kg, 330kg. When the user has special requirements, the supply and demand are negotiated. Should be carried with light and light. It is strictly prohibited to expose to the scorching sun and impact to prevent rupture of the container. The package shall be marked with the name of the manufacturer, site, product name, specification, grade, batch number, net content, date of production, trademark and No. Of this standard. Belongs to grade II inorganic acid corrosion articles, risk code number; GB 8.1 class 81501. UN N0.1805; IMDG CODE P. 8024, Category 8.1. Should be stored in a cool, ventilated warehouse. High concentration of phosphoric acid in the winter cold area should pay attention to heat preservation, prevent icing, prevent container rupture leakage. It shall not be stored and mixed with alkalis, toxic substances and other corrosive substances. Fire, dry sand, dry powder can be used to stop the fire.