scholarly journals Antipyrene preparation based on phosphoric acid with carbamide

2020 ◽  
Vol 3 (10) ◽  
pp. 292-299
Author(s):  
Olimova Mohinur Karimjon qizi
Keyword(s):  
Phosphoric Acid ◽  
Orthophosphoric Acid ◽  
Dihydrogen Phosphate ◽  
Ammonium Dihydrogen Phosphate ◽  
Fire Retardants ◽  
Nitrogen And Phosphorus ◽  
Phosphorus Containing

In this work, we have carried out research on the synthesis of nitrogen and phosphorus-containing fire retardants. Epichlorohydrin, urea, melamine, ammonium dihydrogen phosphate, orthophosphoric acid, morpholine were selected as objects of research

scholarly journals Mathematical Modeling of Urea Reaction with Sulfuric Acid and Phosphoric Acid to Produce Ammonium Sulfate and Ammonium Dihydrogen Phosphate Respectively

Energies ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 8004
Author(s):  
Juan Carlos Beltrán-Prieto ◽  
Karel Kolomazník
Keyword(s):  
Sulfuric Acid ◽  
Phosphoric Acid ◽  
Ammonium Sulfate ◽  
Organic Fertilizer ◽  
Reaction Rates ◽  
Dihydrogen Phosphate ◽  
Ammonium Dihydrogen Phosphate ◽  
Acid Media ◽  
Safe Handling ◽  
Full Conversion

Urea is the final product of protein metabolism in mammals and can be found in different biological fluids. Use of mammalian urine in agricultural production as organic fertilizer requires safe handling to avoid the formation of ammonia that will decrease the fertilizer value due to the loss of nitrogen. Safe handling is also required to minimize the decomposition of urea into condensed products such as biuret and cyanuric acid, which will also have a negative impact on the potential sustainable production of crops and sanitation technologies. The study of thermodynamics and reaction kinetics of urea stabilization plays a key role in understanding the conditions under which undesirable compounds and impurities in urea-based fertilizers and urea-based selective catalytic reduction systems are formed. For this reason, we studied the reaction of urea in acid media to achieve urea stabilization by modeling the reaction of urea with sulfuric acid and phosphoric acid, and estimating the reaction enthalpy and adiabatic heat difference for control of the heat released from the neutralization step using Ca(OH)2 or MgO for the safety of the process. Numerical and simulation analyses were performed by studying the effect of the surrounding temperature, the ratio of acid reagent to urea concentration, the rate of addition, and the reaction rate to estimate the required time to achieve an optimum value of urea conversion into ammonium dihydrogen phosphate or ammonium sulfate as potential technological opportunities for by-product valorization. Full conversion of urea was achieved in about 10 h for reaction rates in the order of 1 × 10−5s−1 when the ratio of H2SO4 to CH4N2O was 1.5. When increasing the ratio to 10, the time required for full conversion was considerably reduced to 3 h.

scholarly journals Mass transfer process study of Fe(III) extraction from ammonium dihydrogen phosphate solution

2020 ◽  
Vol 85 (8) ◽  
pp. 1055-1065
Author(s):  
Weiqi Li ◽  
Hui Liu ◽  
Jun Li ◽  
Caixia You ◽  
Jianhong Luo ◽  
...  
Keyword(s):  
Phosphoric Acid ◽  
Mass Transfer Process ◽  
Dihydrogen Phosphate ◽  
Phosphate Solution ◽  
Ammonium Dihydrogen Phosphate ◽  
Extraction Mechanism ◽  
Wet Process ◽  
Industrial Grade ◽  
Map Solution ◽  
Kinetics Of

The crystallization of ammonium dihydrogen phosphate (MAP) is largely affected by certain metal ions such as Fe (III), and the influence seems to be pointed at both ends. Therefore, the industrial-grade MAP products can only be obtained by purifying the neutralized MAP solution from wet-process phosphoric acid (WPA). The extraction kinetics of Fe (III) from MAP solution using di-2-ethylhexyl phosphoric acid (D2EHPA) in sulfonated kerosene measured by the Lewis cell. The extraction mechanism is discussed and confirmed on the basis of the dimeric model of D2EHPA in non-polar solution. From the temperature dependence of reaction rate, the value of Ea and Kf are calculated and the extraction regimes are deduced to be mixed controlled with diffusion and chemical reaction for Fe (III). Ultimately, the rate equation for the extraction reaction of Fe (III) with D2EHPA is obtained as follows: Rf = 0.028cFe3+1.2cH2A2 0.81cH+-0.85.

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