Phosphoricacid,ammoniumsalt
Ammonium orthophosphate
CAS: 10124-31-9
Molecular Formula: H12N3O4P
Phosphoricacid,ammoniumsalt - Names and Identifiers
Phosphoricacid,ammoniumsalt - Physico-chemical Properties
| Molecular Formula | H12N3O4P |
| Molar Mass | 149.09 |
| Physical and Chemical Properties | Colorless and transparent crystals of platelets or white rhomboids. |
| Use | Analytical reagents, fine chemical raw materials |
Phosphoricacid,ammoniumsalt - Reference Information
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| agricultural use as fertilizer | ammonium phosphate is composed of phosphoric acid (H3PO4) and ammonia (NH3) the reaction produces a compound fertilizer containing two standard amounts of nitrogen and phosphorus. The most widely used ammonium phosphate varieties in the world are monoammonium phosphate and diammonium phosphate, and the ammonium phosphate used as fertilizer is often a mixture of monoammonium and diammonium. when ammonium phosphate is used as fertilizer in agriculture, special attention should be paid to its thermal decomposition and alkali decomposition. In calcareous soil with a pH value greater than 7.5, decomposition and volatilization of ammonia are easy to occur, and water-soluble phosphorus is converted to phosphorus. The main chemical reaction is: CaCO3 +(NH4)2HPO4--2NH3 + CaHPO4 + CO2 + H2O. ammonium phosphate is a high-concentration and rapid-acting compound fertilizer. The content of N + P2O5 is about 64%, which is soluble in water and has high salt index. The salt index of monoammonium phosphate and diammonium phosphate are 30 and 34, respectively. Therefore, special attention should be paid to the direct contact with the seed when the seed fertilizer is used, in order to avoid the release of ammonia in the molecule of the burn. Ammonium phosphate can be used as base fertilizer and topdressing, but because the phosphorus nutrient contained in its molecule is higher than that of nitrogen, the N: P2O5 ratio of monoammonium phosphate is about 1:5, and the diammonium phosphate is about 1:2.5, in order to fully exert the effect of phosphorus in the early stage of crop growth, it is generally appropriate to be used as a base fertilizer, for those with high available phosphorus or for crops with relatively low phosphorus requirements such as rice, even if it is used as a basal fertilizer, a certain amount of nitrogen fertilizer must be applied to adjust the ratio of N: P2O5 to an appropriate level. Ammonium phosphate can be applied in admixture with most fertilizers, but must be avoided in admixture with alkaline fertilizers, which can promote the decomposition of ammonium phosphate and release ammonia. In addition, using ammonium phosphate as raw material, can also be made into a variety of compound fertilizer, the main varieties are: ① ammonium sulfate phosphate. Such as 32% ammonium phosphate and 59% ammonium sulfate production grade of 16-20-0 ammonium phosphate, the physical properties of the product is good, the critical moisture absorption point for the relative humidity of 75.8%, higher than the monoammonium phosphate; ② ammonium phosphate nitrate. Representative varieties of the grade 25-25-0, 28-14-0, etc., by phosphoric acid nitric acid mixed acid and ammonia neutralization products; Urine ammonium phosphate. This is a high concentration of solid compound fertilizer, there are N-P type and N-P-K type, such as grade 28-28-0 and 22-22-11 varieties, generally by the ammonium phosphate slurry or by the powder granular products and spray granulated urea granulation together, the product is good physical, suitable for a variety of soil and crops. |
| compound fertilizer | ammonium phosphate (ammonium phosphate for short) is a binary compound fertilizer of nitrogen and phosphorus made by neutralizing phosphoric acid with ammonia. Monoammonium phosphate (NH4H2PO4) and diammonium phosphate [(NH4)2HPO4] are available due to different degrees of neutralization 〕. Monoammonium phosphate contains 11% ~ 12% N and 560% P2O; Diammonium phosphate contains 20% ~ 21% N and 551% ~ 53% P2O. Most ammonium phosphate produced in China is monoammonium phosphate with N 12% and P2O 560%. The pH of the aqueous solution was 7.0-7.2. Gray or dark gray, generally made into granular, good physical properties. Suitable for use in a variety of soils and crops. Ammonium phosphate can be used as base fertilizer and topdressing. When it is used in cereal crops, it should be supplemented with appropriate amount of nitrogen fertilizer. Ammonium phosphate is the preparation of a series of mixed compound fertilizer or mixed compound fertilizer base fertilizer, such as urea can be made into urea ammonium phosphate, nutrient content of 28~28~0. |
| production method | neutralization method diammonium hydrogen phosphate is added into the chemical tank and dissolved in hot water at about 60 ℃, prepared into a solution of about 50% concentration, after filtration, the clear liquid is sent to the reactor, slowly adding 27% ~ 28% ammonia water under stirring for neutralization reaction, and the triammonium phosphate solution is formed when the pH value is 14, the reaction solution was put into a cooling crystallizer, and after all the triammonium phosphate crystals were precipitated, the reaction solution was centrifuged and dried to obtain triammonium phosphate. |
Last Update：2024-04-10 22:29:15
