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Author: Subject: Diammonium phosphate
idrbur
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sad.gif posted on 15-5-2016 at 06:50
Diammonium phosphate


Today i got about 1 kg DAP and i was thinking to convert it into NH4NO3 but there are some problems and confusion

1 DAP is impure may be the impurity is a binder ,so how can i separate that impurity and

2 is it possible to make NH4NO3 by directly adding HNO3 to DAP , if yes then how can i separate NH4NO3 from H3PO4 or should i first make ammonia from DAP and than pass it through HNO3.
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Aqua-regia
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[*] posted on 15-5-2016 at 07:21


Dont add nitric acid to DAP solution. Buy ammonium nitrate or calciumammonium nitrate. Both is fertiliser. You can it dissolving in hot water filter and concentrate to get the cristaline AN.
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macckone
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[*] posted on 15-5-2016 at 14:50


DAP + calcium chloride in water will yield calcium phosphate as a precipitate.
Ammonium Chloride + Nitric acid will yield ammonium nitrate and off gas hydrogen chloride.
Calcium nitrate + DAP would yield a direct route.
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idrbur
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[*] posted on 15-5-2016 at 23:58


Firstly if i can get NH4NO3 from market why would i try to convert DAP to NH4NO3. In my region only 2 fertilizers are easily available DAP and urea.
And is there any way to purify DAP?
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feacetech
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[*] posted on 16-5-2016 at 17:02


DAP isn't a pure product is manufactured from phosphate rock so contains various impurities and contaminants

If you can get Urea and DAP you can also get CAN is my bet, extract the AN from the CAN
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idrbur
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[*] posted on 16-5-2016 at 21:16


there only 2 fertiliers available here i searched for other fertilizers in market but got nothing. therefor finally i decided to get DAP and now i want to know how to purify it.
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feacetech
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[*] posted on 17-5-2016 at 16:43


quite frankly I don't believe that. where is "here".

your region is missing an important macro element (two or three if you count S and Ca) if you can only get Urea and DAP.

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idrbur
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[*] posted on 18-5-2016 at 18:56


i am trying to make NH4NO3 from DAP and i am not trying to extract NH4NO3 on a large scale .i am conducting it on an experimental scale .so i just want to now the correct method to do so.
well i had added some HNO3 to DAP few days ago and now water from the mixture is evaporated and some needle like crystals has appeared is that NH4NO3?


[Edited on 19-5-2016 by idrbur]
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Aqua-regia
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[*] posted on 19-5-2016 at 08:15


Your crystals still partial DAP. HNO3 boiled mainly off . You have options:


-Buy household ammonia and neutralize with diluted HNO3
- Heat urea in oil bath over 130 degree and the liberated ammonia lead in very diluted and chilled HNO3 then evaporate to get your crystals
-do this what macckone wrote

Do you from US? Because in Europe there are plenty CAN.
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glymes
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[*] posted on 19-5-2016 at 08:17


Would NH4Cl also decompose on heating to NH3 and HCl? This might be easier to get
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idrbur
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[*] posted on 19-5-2016 at 08:35


I will try to neutralize HNO3 with NH3.
NH4Cl will doesn't decomposes on heating.
And yes i'm from india.

Thanks everyone for your suggestions.
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