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Ammonium dihydrogen phosphate

CAS:
7722-76-1
MF:
H6NO4P
MW:
115.03

Properties

Melting point:
190 °C (dec.)(lit.)
Boiling point:
87.4 °C
Density 
1.02 g/mL at 20 °C
vapor pressure 
0.066 hPa (125 °C)
RTECS 
TC6587000
storage temp. 
2-8°C
solubility 
H2O: 0.1 M at 20 °C, clear, colorless
form 
Solid
color 
White or colorless
Specific Gravity
1.803
PH
3.8-4.4 (25℃, 50mg/mL in H2O)
PH Range
3.8 - 4.4
Water Solubility 
368 g/L (20 ºC)
λmax
λ: 260 nm Amax: ≤0.059
λ: 280 nm Amax: ≤0.050
Merck 
14,543
InChIKey
LFVGISIMTYGQHF-UHFFFAOYSA-N

Safety Information

Symbol(GHS) 

GHS07
Hazard statements 
H315-H319-H335
Precautionary statements 
P261-P280a-P304+P340-P305+P351+P338-P405-P501a
Hazard Codes 
Xi
Risk Statements 
36/37/38
Safety Statements 
24/25-36-26
RIDADR 
UN3264
WGK Germany 
1
TSCA 
Yes
HazardClass 
8
PackingGroup 
III
HS Code 
31054000
Toxicity
LD50 orally in Rabbit: 5750 mg/kg LD50 dermal Rabbit > 7940 mg/kg

Use

Venturi loop reaction method: 85% thermal phosphoric acid will be diluted 1.3 to 1.4 times, after the measurement into the venturi tube flow mixing reactor, where it is sufficiently homogeneously mixed and reacted with the incoming ammonia gas, and the reaction process is continued in the pipeline. Finally the qualified liquid enters into the cycle reaction tank, adjusting the Ph value between the range 4.4 to 4.6, filtering and cooling the filtrate down to 26 oC, obtaining the crystal solid, separating and dehydrating, and then drying it to obtain the dihydrogen phosphate Ammonium products. H3PO4 + NH3 NH4H2PO4 Neutralization method: firstly dilute the phosphoric acid to get a solution with 50% to 55% concentration, and then take some measured solution into an enamel reaction tank with stirring and jacket. In stirring, the ammonia gas is slowly added into the ammonia tube distributor for neutralization. Waiting till the Ph value of the neutralized solution gets between 4.2~4.6, filter it immediately and send it into the cooling crystallization mold, then obtain crystallization when the temperature gets down to 26 . Dry after dehydration and then obtain ammonium dihydrogen phosphate products. H3PO4 + NH3 NH4H2PO4 Mother liquor from separator is added into the iron remover with ammonium sulfide for removing iron, filtering, and then senting to the acid tank to adjust the acidity to Ph4.4~4.6. Refined mother liquor is supplied for recycling. Metathesis method Calcium dihydrogen phosphate and ammonium sulfate were melted at 85-90 C to produce a clear solution below the saturation concentration. Firstly, the calcium dihydrogen phosphate solution is added into the reactor, and the temperature of the steam is raised to 95 oC under stirring, and the ammonium sulphate solution is added slowly for metathesis reaction to produce ammonium dihydrogen phosphate and calcium sulphate. The end point of the reaction is that Ph value is about 4.4 to 4.6. After filtration, the filtrate is sent into the evaporator to the boiling point of 108 C, and then is sended into the cooling crystallizer, cooling to 40 C for crystallization, centrifugal separating, drying, and then obtaining ammonium dihydrogen phosphate product. Ca (H2PO4) 2 H2O + (NH4) 2SO4 This product + CaSO4 + H2O The separated calcium sulfate is filtered and washed to produce a by-product. The lotion is returned for the feed.

337 supplier list of "Ammonium dihydrogen phosphate"

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Ammonium dihydrogen phosphate Related Search:

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