DIAMMONIUM PHOSPHATE

PRODUCT IDENTIFICATION
CAS NO.

7783-28-0

DIAMMONIUM PHOSPHATE
EINECS NO. 231-987-8
FORMULA (NH4)2HPO4
MOL WT.

132.05

H.S.CODE

  
TOXICITY  
SYNONYMS

Ammonium phosphate, dibasic;

Diammonium hydrogenorthophosphate; Phosphoric Acid, Diammonium Salt; DAP; Diammonium hydrogenphosphate; Diammonium phosphate; Ammonium hydrogen phosphate;
SMILES  

CLASSIFICATION

 

PHYSICAL AND CHEMICAL PROPERTIES
PHYSICAL STATE

White Crystal
MELTING POINT 155 C (Decomposes)
BOILING POINT  
SPECIFIC GRAVITY 1.62
SOLUBILITY IN WATER 58 g/100ml
pH  

AUTOIGNITION

 
NFPA RATINGS Health: 1; Flammability: 0; Reactivity: 0

REFRACTIVE INDEX

 
FLASH POINT  
STABILITY Stable under ordinary conditions of use and storage

APPLICATIONS
Fertilizer, industrial uses, animal feed
SALES SPECIFICATION

TECH GRADE

APPEARANCE

White Crystal

PURITY

 98.0% min

pH

7.6 - 8.4 (1% sol'n)

SULFATE

0.05 % max

FOOD GRADE

APPEARANCE

White Crystal

PURITY

96.0 - 102.0 %

pH

7.6 - 8.4 (1% sol'n)

SULFATE

0.04 % max

CHLORIDE

0.035 % max

ARSENIC

4 ppm max

HEAVY METAL

10 ppm max
FERTILIZER

APPEARANCE

free flowing light yellow granular

TOTAL N + P

64.0% min

TOTAL N

16.0 - 18.0%

TOTAL P2O5

46.0 - 48.0%

MOISTURE

1.5% max

PARTICLE SIZE

90.0% min (1 - 4.75mm)

PRICE INDICATION

Price: U$270/mt CIF ASWP for 12,500mts per shipment
Payment: Transferable, confirmed, irrevocable at sight Letter of Credit 
TRANSPORTATION
PACKING  
HAZARD CLASS Not regulated
UN NO.  
GENERAL DESCRIPTION OF PHOSPHORIC ACID
Phosphoric acid is a phosphorus-containing inorganic acid made up of phosphorus, oxygen, and hydrogen. In a broardened term, it includes the monomeric (orthophosphoric acid), dimeric (pyrophosphoric acid), and polymeric (metaphosphoric acid) forms of the acid.  Phosphoric acid commonly indicates the monomeric form orthophosphoric acid. On heating to about 225 C, it dehydrates to form pyrophosphoric acid and to metaphosphoric acid (2HPO3 = P2O5.H2O) at higher temperatures. Pyrophosphates are salts of pyrophosphoric acid and metaphosphates are salts of metaphosphoric acid. Two molecules of orthophosphoric acid are formed when three molecules of water are added to one molecule of phosphorus pentoxide (2H3PO4 = P2O5.3H2O). The pyrophosphates are formed by the loss of 1 molecule of water from 2 moles of an orthophosphate. Pure orthophosphoric acid is a crystalline solid; melting point 42 C; soluble in alcohol, and very soluble in water. Phosphoric Acid violently polymerizes under the influence of azo compounds, epoxides and other polymerizable compounds. It forms toxic fumes of phosphorous oxides when combusted. It is a medium strong acid and attacks metals to release flammable hydrogen gas. Decomposition may occur on contacting with alcohols, aldehydes, cyanides, ketones, phenols, esters, sulfides, halogenated organics compounds.

Phosphoric acid is essential in the body organism as the constituent of bones and teeth as well as in many metabolic process of carbohydrate, fat and protein. Phosphoric acid is abundant in natural foods as the form of free phosphoric acid itself or as the mineral salts (potassium, sodium or calcium). Phosphoric acid is used to acidify foods and beverages. But the continuous and excessive absorption of beverages particularly Coca Cola and Pepsi Cola which contain large amount of phosphoric acid should be limited. Phosphate excretion takes place in the form of calcium phosphate. The excessive amounts of phosphoric acid in the body may cause calcium deficiency which causes poor teeth and weak bone density (osteoporosis). Phosphoric acid is used in pharmaceutical preparations as a solvent and as a gastric acidifier orally.  Phosphoric acid is important raw material in industrial field. It is a tribasic acid (having three replaceable hydrogen atoms) which can forms phosphates with either one, two, or all three of the hydrogen by replacing with some other positive ion. The structure of the phosphate anion consists of phosphorus at the center of a tetrahedron defined by a solid bond between one oxygen atom and phosphorus and single bonds for the other oxygen atoms. In this very formal depiction, negative charge is localized on the O atoms of the single P-O bonds. It is used in making fertilizers, electrolytes, electroplating and derusting solutions. It is used in the manufacture of industrial cleaning products, other inorganic and organic phosphoric chemicals, foundry resins, paints, enamels and refractory, antifreeze productions, and textile process materials. It is used in water treatment. Food grade phosphoric acid is used; as a acidulation in soft drink (particularly cola); ph control in imitation jellies; nutrient in production of yeast; bacteria growth control in selected processed foods; flocculating agent for clarification of sugar juices after liming process.

  • Phosphorous acid:  a diprotic acid which contains one hydrogen bonded directly to the central phosphorus atom and two hydrogens bonded to oxygen
  • Phosphite:any salt, ester or anion of phosphorous acid
  • Phosphate: any salt, ester or anion of phosphoric acid
  • Phosphide: any binary compound of phosphorus with another element or radical
  • Phosphine:  binary compound of phosphorus with hydrogen or organic compounds derived from this

One of the important phosphates is calcium phosphate, Ca3(PO4)2. The most important phosphorus fertilizer is monobasic calcium phosphate, called superphosphate[Ca(H2PO4)2], derived by treating rock phosphate with sulfuric acid (or phosphoric acid).  Superphosphate is soluble in water and acts as a carrier of phosphorus needed by plants. Dibasic calcium phosphate (CaHPO4) is used in pharmaceuticals, animal feeds, and toothpastes. Tribasic calcium phosphate, [Ca3(PO4)2] is used as a fertilizer and as a plastics stabilizer. Other important inorganic phosphates include ammonium phosphate [(NH4)2HPO4] used as a fertilizer and fire retardant; trisodium phosphate used in detergents and for softening water; mono and disodium phosphate used for dispersion, sequestration, scale inhibition and preparing baking powders. The salt forms of phosphate polymers is used as a sequestering agent. As phosphate polymers themselves are hydrated in water at high temperature or high pH, and thereby revert to a more simple and stable phosphate form, which can no longer sequester metal ions.

Mono and dibasic phosphate esters produced by the reaction of either alcohols, alcohol ethoxylates or phenyl ethoxylates with polyphosphoric acid or phosphorous pentoxide are anionic surfactants which have the main feature of the stability in alkaline conditions over other surfactants. They have a wide range of properties including outstanding wetting, emulsification, lubrication, coupling activity and detergency. They exhibit the properties of anti-wear and corrosion inhibition either as free esters or in the forms of metal and amine salts. They are used in:
  • Heavy duty alkaline cleaning products
  • Laundry Detergents
  • Emulsion polymerisation
  • Textile auxiliaries
  • Acid cleaners
  • Metal working fluids
  • Emulsifiers
  • Wetters
  • Dispersants
  • Water based lubricants
  • Intermediate for the synthesis of other anionic surfactants

Phosphoric acid alkyl esters are also used as alkylation agent for nitrogen heterocyclic compounds and as catalysts to produce phenolic and urea resins. They are used flame retarding plasticizers for cellulose esters, lacquers, plastic and vinyl resins as well as as dispersing agents in plastisols. They are used as solvents in liquid-liquid extractants or separation agent of metals. They are is used as heat exchange media and as pigment grinding assistants and antifoam agents.