Determination of the Solubility of Ammonium Dihydrogen Phosphate in Water–Ethanol System at Different Temperatures from 283.2 to 343.2 K

Xu, Dong; Xiong, Xiaoli; Yang, Lin; Zhang, Zhiye; Wang, Xinlong

doi:10.1021/acs.jced.5b00224

Cited by 21 publications

(7 citation statements)

References 18 publications

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“…Figure (a) and (b) shows that the particles of (NH 4 )(H 2 PO 4 ) obtained in both methods had stick-like shapes, with some agglomerations. The powder XRD spectra of (NH 4 )(H 2 PO 4 ) particles obtained by the freeze-dissolving method and the freeze-drying method proved to be the same polymorph as the anhydrate form reported . The particles obtained by the two methods had good crystalline structures, shown as sharp peaks in the powder XRD spectra.…”

Section: Resultsmentioning

confidence: 55%

“…The powder XRD spectra of (NH 4 )(H 2 PO 4 ) particles obtained by the freeze-dissolving method and the freeze-drying method proved to be the same polymorph as the anhydrate form reported. 28 The particles obtained by the two methods had good crystalline structures, shown as sharp peaks in the powder XRD spectra. They shared the same powder XRD spectrum as that of the simulated XRD spectrum from the single crystal of the anhydrate form.…”

Section: Resultsmentioning

confidence: 93%

“…Therefore, the ice scaffolding will be quickly dissolved in the second solvent, with only the target materials left as a solid phase in the solution, and the structure of target materials formed inside the ice will be preserved. Sodium bicarbonate, − baking soda, and ammonium dihydrogen phosphate, fire extinguishing agents, , are soluble in water and insoluble in ethanol. NaHCO 3 or (NH 4 )(H 2 PO 4 ) in water with different concentrations was used to produce nanoparticles by the freeze-dissolving method, which were compared with nanoparticles generated by freeze-drying, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Freeze-Dissolving Method: A Fast Green Technology for Producing Nanoparticles and Ultrafine Powder

Wang

Luo

et al. 2022

ACS Sustainable Chem. Eng.

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A new technology, a freeze-dissolving method, has been developed to isolate nanoparticles or ultrafine powder and is a more efficient and sustainable method than the traditional freeze-drying method. In this work, frozen spherical ice particles were produced with an aqueous solution of sodium bicarbonate or ammonium dihydrogen phosphate at various concentrations to generate nanoparticles of NaHCO 3 or (NH 4 )(H 2 PO 4 ). The freeze-drying method sublimates ice, and nanoparticles of NaHCO 3 or (NH 4 )(H 2 PO 4 ) in the ice templates remain. The freeze-dissolving method dissolves ice particles in a low freezing point solvent at temperatures below 0 °C, and then, nanoparticles of NaHCO 3 or (NH 4 )(H 2 PO 4 ) can be isolated after filtration. The freeze-dissolving method is 100 times faster with about 100 times less energy consumption than the freeze-drying method as demonstrated in this work with a much smaller facility footprint and produces the same quantity of nanoparticles with a more uniform size distribution.

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Section: Resultsmentioning

confidence: 55%

Section: Resultsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Freeze-Dissolving Method: A Fast Green Technology for Producing Nanoparticles and Ultrafine Powder

Wang

Luo

et al. 2022

ACS Sustainable Chem. Eng.

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“…The concentrations of metal ions in the permeate and filtration cake were determined by an inductively coupled plasma‐optical emission spectrometer (ICP‐OES, Perkin Elmer, America). The contents of P 2 O 5 and N were measured by the gravimetric analysis and micro‐kjeldahl method . The generated water‐insoluble compounds were characterized by x‐ray powder diffraction (XRD, PANalytical B. V., UK), a Fourier transform infrared spectrometer (FTIR, Thermo Nicolet Corporation, America), and an x‐ray photoelectron spectrometer (XPS, Kratos Analytical Ltd., UK).…”

Section: Methodsmentioning

confidence: 99%

Chelation of metal ions with citric acid in the ammoniation process of wet‐process phosphoric acid

Wan

Luo

et al. 2019

Can J Chem Eng

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A new process is proposed in which citric acid is added during the ammoniation process of wet-process phosphoric acid (WPA) to chelate metal ions to produce fertilizer ammonium dihydrogen phosphate (MAP) containing medium trace elements. The parameters of the chelation reaction were studied systematically and the results show that the optimal reaction condition is pH 3.0, reaction time 60 minutes, temperature 50.0 C, and citric acid content 1.48%. The XRD patterns show that the waterinsoluble compounds are complex mixtures, and the composition of the waterinsoluble compounds are changed through the addition of citric acid. FTIR and XPS analyes further demonstrate that water-insoluble compounds are complex mixtures. The XRD patterns of the MAP products indicate that the structure and morphology of the MAP were changed by the addition of citric acid. In addition, the contents of major elements, medium elements, and trace elements in the MAP product are 68.72%, 0.24%, and 0.50%, respectively, which is consistent with the relevant China national standard. K E Y W O R D Sammonium dihydrogen phosphate, chelation, citric acid, wet-process phosphoric acid

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“…In the washing step, low-pressure steam or hot water can be used to dissolve (NH 4 ) 2 SO 4 crystals [10]. Since the solubility of MDP in water is close to that of (NH 4 ) 2 SO 4 [38,39], similar procedures can be used to rejuvenate used H 3 PO 4 /C and H 3 PO 4 /A. For H 2 SO 4 /C, the performance of the rejuvenated one is close to the fresh sorbents [10].…”

Section: Structure Of H 3 Po 4 /C and H 3 Po 4 /A Characterized By X-ray Diffraction (Xrpd)mentioning

confidence: 99%

Effects of Moisture on NH3 Capture Using Activated Carbon and Acidic Porous Polymer Modified by Impregnation with H3PO4: Sorbent Material Characterized by Synchrotron XRPD and FT-IR

2022

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The performances of reactive adsorbents, H3PO4/C (activated carbon) and H3PO4/A (Amberlyst 35), in removing NH3 from a waste-gas stream were investigated using a breakthrough column. Accelerated aging tests investigated the effects of the water content on the performance of the adsorbents. Results of breakthrough tests show that the adsorption capacity greatly decreased with the drying time of H3PO4/C preparation. Synchrotron XRPD indicated increased amorphous phosphorus species formation with drying time. Nitrogen adsorption-desorption isotherms results further suggested that the evaporation of water accommodated in macropores decreases adsorption capacity besides the formation of the amorphous species. Introducing water moisture to the NH3 stream increases the adsorption capacity concomitant with the conversion of some NH4H2PO4 to (NH4)2HPO4. Due to the larger pore of cylindrical type and more hydrophilic for acidic porous polymer support, as opposed to slit-type for the activated carbon, the adsorption capacity of H3PO4/A is about 3.4 times that of H3PO4/C. XRPD results suggested that NH3 reacts with aqueous H3PO4 to form NH4H2PO4, and no significant macropore-water evaporation was observed when acidic porous polymer support was used, as evidenced by N2 isotherms characterizing used H3PO4/A.

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Determination of the Solubility of Ammonium Dihydrogen Phosphate in Water–Ethanol System at Different Temperatures from 283.2 to 343.2 K

Cited by 21 publications

References 18 publications

Freeze-Dissolving Method: A Fast Green Technology for Producing Nanoparticles and Ultrafine Powder

Freeze-Dissolving Method: A Fast Green Technology for Producing Nanoparticles and Ultrafine Powder

Chelation of metal ions with citric acid in the ammoniation process of wet‐process phosphoric acid

Effects of Moisture on NH3 Capture Using Activated Carbon and Acidic Porous Polymer Modified by Impregnation with H3PO4: Sorbent Material Characterized by Synchrotron XRPD and FT-IR

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