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Send EmailAmmonium Dihydrogen Phosphate, Monoammonium Phosphate, Mono Ammonium phosphate, MAP, 7722-76-1
CAS: 7722-76-1
Molecular Formula: H6NO4P
Names and Identifiers
| Name | Ammonium dihydrogen phosphate |
| Synonyms | MAP Monoammonium Phosphate ammoniumdiacidphosphate mono-Ammonium phosphate Mono Ammonium Phosphate Mono Amonnium Phosphate ammoniumdihydrophosphate Ammonium diacid phosphate ammoniummonobasicphosphate ammoniumphosphate(nh4h2po4) mmonium phosphate, monobasic Ammonium phosphate monobasic Ammonium dihydrogen phosphate Ammonium phosphate, monobasic ammoniumorthophosphatedihydrogen Ammonium dihydrogen orthophosphate ammoniummonobasicphosphate(nh4h2po4) Ammonium Hydrogen Monohydric Phosphate ammoniumdihydrogenphosphate((nh4)h2po4) |
| CAS | 7722-76-1 |
| EINECS | 231-764-5 |
| InChI | InChI=1S/H3N.H3O4P/c;1-5(2,3)4/h1H3;(H3,1,2,3,4) |
| InChIKey | LFVGISIMTYGQHF-UHFFFAOYSA-N |
Physico-chemical Properties
| 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. |
Risk and Safety
| 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 |
Upstream Downstream Industry
| Raw Materials | Phosphoric acid Ammonia |
7722-76-1 - Nature
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.
Preparation Method
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.
Introduction
Stable in the air, showing an acidic reaction. Soluble in water, slightly soluble in ethanol, insoluble in acetone.
Use
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
Safety
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.
Reference Information
| pH range of acid-base indicator discoloration | 3.8 - 4.4 |
| properties | diamine phosphate is a highly efficient fertilizer widely used in vegetables, fruits, rice and wheat. |
| solubility in water (g/100ml) | grams dissolved per 100ml of water at different temperatures (℃): 22.7g/0 ℃;39.5g/10 ℃;37.4g/20 ℃;46.4g/30 ℃;56.7g/40 ℃; 82.5g/60 ℃;118g/80 ℃;173g/100 ℃ |
| content analysis | accurately weigh about mg of sample, dissolve in 50ml of water, titrated to pH 0.1 with 8.0 mol/L sodium hydroxide. Per mL,0.1mol/L sodium hydroxide corresponds to 11.50mg of diammonium phosphate [NH4H2 PO4]. |
| toxicity | ADI 0-70mg/kg (total phosphate based on phosphorus; FAO/WHO,2001). GRAS(FDA,§ 184.1141a,2000). |
| usage limit | GB 2760-96: meat products, 1 g/kg; Fruits and vegetables peeling, GMP. |
| Use | mainly used for the preparation of compound fertilizer, can also be directly applied to farmland used as analytical reagents, buffer used in food industry as leavening agent, dough regulator, yeast food, brewing and fermentation aid, buffer. It is also used as an animal feed additive. is a high efficient compound fertilizer of nitrogen and phosphorus. It can be used as a flame retardant for wood, paper and fabric, a dispersant for fiber processing and dye industry, an enamel for enamel, a compounding agent for fire-retardant coatings, an burnout agent for wood stems and candle cores, and a dry powder fire extinguishing agent. It is also used in printing plate making and pharmaceutical manufacturing. used as fertilizer, fire retardant, also used in printing plate, pharmaceutical and other industries. preparation of buffer and medium, production of phosphate, phosphor, wood, paper, fabric flame retardant, dry powder extinguishing agent. Analytical standards are used for nitrogen determination by Kjeldahl method. After the first use, argon or nitrogen filling is recommended. 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-resistant coatings, a dry powder fire extinguishing agent, etc. |
| production method | Venturi circulation reaction method 85% thermal phosphoric acid was Diluted 1.3~1.4 times, after being metered, it is sent to the Winnet tubular gas flow mixing reactor, where it is fully and uniformly mixed and reacted with the introduced ammonia gas, and the reaction process is continued to be completed in the pipeline. Finally, enter the qualified reaction solution in the circulation reaction tank, adjust the pH value in the range of 4.4~4.6, filter, cool the filtrate to below 26 ℃ in the cooling crystallizer, precipitate crystals, separate and dehydrate, after drying, the final ammonium dihydrogen phosphate was obtained. The H3PO4 + NH3 → NH4H2PO4 neutralization method first diluted phosphoric acid to 50% ~ 55%, after the measurement of dilute phosphoric acid into the enamel reaction tank with stirring and jacket, under stirring, the neutralization reaction was carried out by slowly passing ammonia gas through a circular ammonia distributor. When the reaction solution is neutralized to a pH value of 4.2-4.6, it is filtered while hot, then sent to a cooling crystallizer, cooled to about 26 ° C. To precipitate crystals, separated and dehydrated, and then dried to obtain a final ammonium dihydrogen phosphate product. The mother liquor from the H3PO4 + NH3 → NH4H2PO4 separator is sent to the iron remover, and ammonium sulfide is added to remove iron. After filtration, the mother liquor is sent to the acid regulating tank to adjust the acidity to pH 4.4~4.6. The refined mother liquor is supplied for recycling. Double decomposition method of Calcium dihydrogen phosphate and ammonium sulfate in 85~90 deg C for melting, made below the saturation concentration of clear solution. First, add the Calcium dihydrogen phosphate solution to the reactor, Under stirring, steam was added to raise the temperature to above 95 ° C., and then ammonium sulfate solution was slowly added for metathesis reaction to generate ammonium dihydrogen phosphate and calcium sulfate. The end point of the reaction was Ph4.4 ~ 4.6. After filtration, the filtrate is sent to the evaporator to evaporate to a boiling point of 108 ° C., then put into a cooling crystallizer, cooled to 40 ° C. Or less to precipitate crystals, centrifuged and dried to prepare a finished ammonium dihydrogen phosphate product. Its Ca(H2PO4)2? H2O +(NH4)2SO4 → this product + CaSO4 + H2O filter separated calcium sulfate, after washing to produce by-products. The washing liquid was returned to the feed. industrial production methods include neutralization method and double decomposition method, but at present, neutralization method is widely used. The Venturi circulation reaction method refers to ammonium dihydrogen phosphate, and only increases the process of purifying the solution with arsenic removing agent and heavy metal removing agent, and filtering to remove impurities such as arsenic and heavy metals. Neutralization method the calculated amount of refined phosphoric acid and the treated mother liquor are added into the reactor with stirring and jacket, and ammonia water with a concentration of about 28% is slowly added according to the calculated amount under stirring, since ammonia water contains a large amount of water, phosphoric acid is diluted, the density of the reaction liquid phase is about 1.35, and the reaction proceeds continuously. The endpoint of the reaction solution was pH 4.4-4.6. Add arsenic removal agent and heavy metal removal agent for solution purification, filtration, removal of arsenic and heavy metals and other impurities, the filtrate is evaporated and concentrated to the surface of the crystal film, release cooling to about 26 degrees Celsius, precipitation crystallization, centrifugal separation, Dry, prepared edible ammonium dihydrogen phosphate products. The mother liquor of H3PO4 + NH4OH → NH4H2PO4 + H2O is subjected to iron removal treatment and returned to the process for recycling. |
