7783-28-0

Basic information

• Product Name: Ammonium hydrogen orthophosphate
• Synonyms: Ammonium hydrogen phosphate;Ammonium monohydrogen phosphate;Ammoniumorthophosphate dibasic;Ammonium phosphatedibasic;Diammonium acid phosphate;Diammonium hydrogen phosphate((NH4)HPO4);Diammonium orthophosphate;Dibasic ammonium phosphate
• CAS NO: 7783-28-0
• Molecular Formula: H9N2O4P
• Molecular Weight: 132.056221
• EINECS: 231-987-8
• Mol File: 7783-28-0.mol
• Article Data: 7

Chemical Properties

• Melting Point: 155 °C
• Boiling Point: 158 °C at 760 mmHg
• Appearance: white crystalline powder
• Density: 1.619 g/cm³
• Water Solubility: 58 g/ 100mL (10℃)
• CAS DataBase Reference: Ammonium hydrogen orthophosphate(CAS DataBase Reference)
• NIST Chemistry Reference: Ammonium hydrogen orthophosphate(7783-28-0)
• EPA Substance Registry System: Ammonium hydrogen orthophosphate(7783-28-0)

Safety Data

• Hazard Codes: Xi:Irritant
• Statements: R36/37/38:
• Safety Statements: S26:; S36:
• Hazardous Substances Data: 7783-28-0(Hazardous Substances Data)

Usage

General Description

Ammonium hydrogen orthophosphate, also known as diammonium phosphate (DAP), is a water-soluble chemical compound with the formula (NH4)2HPO4. This salt is useful as a fertilizer for its high content of nitrogen and phosphorous, two of the three essential nutrients for plant growth - the third being potassium. DAP is also used as a leavening agent in food to help it rise, as well as a fire retardant and yeast nutrient in brewing and winemaking. It's often seen as a white crystalline solid and may cause mild skin irritations or more serious harm if ingested or inhaled in large quantities.

InChI:InChI=1/2H3N.H3O4P/c;;1-5(2,3)4/h2*1H3;(H3,1,2,3,4)/p-1

Upstream product

• 86119-84-8 phosphoric acid 
• 1333-74-0 hydrogen 
• 10124-31-9 diammonium phosphate 
• 57-13-6 urea 
• 14700-20-0 phosphoramidic acid 
• 1066-33-7 ammonium bicarbonate 
• 13446-12-3 ammonium dihydrogenphosphite 
• 7664-41-7 ammonia 
• 7789-77-7 calcium hydrogen phosphate 
• 7803-63-6 ammonium bisulfate 
• 10102-43-9 nitrogen(II) oxide 

Downstream Products

• 721880-19-9 CePO4, hexagonal, low temperature 
• 721880-19-9 CePO4, high temperature, monoclinic 
• 13843-41-9 lithium pyrophosphate 
• 721880-19-9 cerium orthophosphate 

Relevant articles and documents

PROCESS FOR RECOVERING PHOSPHORIC ACID FROM SOLID PHOSPHORUS SOURCES

The invention pertains to a process for preparing phosphoric acid from a solid phosphorus-containing material, comprising the steps of: - reacting a solid phosphorus-containing material with strong acid in an amount of 1.0-15 mole acid, calculated as protons, per mole of phosphorus (calculated as P) in the solid phosphorus-containing material in a monophasic reaction medium comprising an organic solvent, to form a solution of phosphoric acid in organic solvent and remaining solid material, - separating the solution of phosphoric acid in organic solvent from the remaining solid material. It has been found that phosphoric acid can be recovered from a solid phosphorus-containing material in high purity and efficiency via a solid-state rearrangement/elution process. The process according to the invention does not require the use of the large amounts of water required by the conventional dissolution/extraction processes known in the art. The solution of phosphoric acid in organic solvent can be used as a starting material for further processes.

Method for preparing hydroxylamine

A method for preparing hydroxylamine is provided that includes the steps of (i) pretreating an acidic buffer solution; and (ii) reducing nitrate ions in the acidic buffer solution with hydrogen to give hydroxylamine in the presence of catalysts, wherein the pretreatment is performed by adding a precipitant represented by formula (I) to the acidic buffer solution, [in-line-formulae][(A)aM(CN)6.xH2O]??(I) [/in-line-formulae] allowing the metal impurities in the acidic buffer solution to react with the precipitant to form metal complex, and then to remove the metal complex. The metal complex is formed and separated by pretreating the acidic buffer solution with a specific precipitant without adjusting pH and changing the composition of the acidic buffer solution prior to hydroxylamine synthesis, thus enhancing the selectivity of the hydroxylamine production.

Solid-Phase Interaction of Fluorapatite with Ammonium Hydrogen Difluoride

A solid-phase interaction of fluorapatite with ammonium difluoride was studied in the temperature range 25-900°C. At room temperature, calcium fluoride and ammonium dihydrogen phosphate or isostructural ammonium florophosphate were formed as the result of grinding a mixture of theinitial components. Above 200°C, the reaction was accompanied by the formation of a volatile phosphor compound. At the final stage of th e process (above 500°C), glassy ammonium hydrogen ultrafluorophosphate of nonstoichiometric composition was formed, which again yielded fluorapatite upon reaction with calcium fluoride.