Growth kinetics of KH2PO4 crystals in relation to solution macrocomposition

Vorontsov, Dmitry А.; Ershov, V. P.; Portnov, V. N.; Rodchenkov, V. I.; Sibirkin, A. A.

doi:10.1016/j.jcrysgro.2010.10.086

Cited by 4 publications

(2 citation statements)

References 14 publications

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“…21 The growth rate and birth rate parameters are intimately related to the solution structure. 22 Supersaturation and pH value of the solution have been recognized as two important parameters that can influence the growth rate and quality of KDP-family crystals. 23,24 In situ measurements of structural dynamics of crystal constituents, including cation and anion groups, in different aqueous solution conditions can strengthen the understanding of the crystallization mechanisms of ADP crystals.…”

Section: Introductionmentioning

confidence: 99%

Direct in situ ATR-IR spectroscopy of structural dynamics of NH4H2PO4 in aqueous solution

Sun

Xue

2013

CrystEngComm

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family crystals depends on the chemical bonding behavior of the crystal constituents in aqueous solution, which are sensitive to solution conditions. We applied in situ ATR-IR spectroscopy combined with a morphology-evolution calibration to declare the structural dynamics of NH 4 + and H 2 PO 4 2 during the NH 4 H 2 PO 4 crystallization in aqueous solution with different concentrations and pH values. For unsaturated NH 4 H 2 PO 4 solution, both the H 2 PO 4 2 stretching vibration mode and NH 4 + bending vibration mode are enhanced with increasing concentration. When the NH 4 H 2 PO 4 solution becomes a saturated and then supersaturated and crystalline state, H 2 PO 4 2 ions undergo hydrated dimerisation and polymerisation, which can be recorded by the appearance and red shift of the P-O … H-O-P in-plane bending vibration mode from 1250 to 1263 cm 21 . During this process, hydrated NH 4 + ions bind to the (H 2 PO 4 2 ) n frame, reflected by the splitting of the HN 4 + bending vibration mode at 1450 and 1400 cm 21 . For the supersaturated NH 4 H 2 PO 4 solution, HPO 4 22 and H 2 PO 4 2 coexist in solution with increasing pH value up to 6.64, whereas H 3 PO 4 and H 2 PO 4 2 coexist with decreasing pH value down to 1.52. Such an in situ recording strategy is of particular value in studying system dynamics, and in general to monitor the solution concentrations and compositions before and during the crystallization process.

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Section: Introductionmentioning

confidence: 99%

Direct in situ ATR-IR spectroscopy of structural dynamics of NH4H2PO4 in aqueous solution

Sun

Xue

2013

CrystEngComm

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“…The concentrated solution contained a certain amount of KCl, which directly affected the crystallization of KH 2 PO 4 . Thus, it is possible to control crystallization conditions by changing the composition of the mother solution . In this work, the effect of different KCl concentrations on KH 2 PO 4 crystallization was measured, and the experimental data are listed in Tabs.…”

Section: Resultsmentioning

confidence: 99%

KH₂PO₄ Production by Cooling Crystallization Using Its Phase Equilibrium in the KH₂PO₄‐KCl‐C₂H₅OH‐H₂O System

Ren

Liu

et al. 2017

Chem Eng & Technol

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Solid-liquid phase equilibrium and physicochemical properties of the KCl-KH 2 PO 4 -C 2 H 5 OH-H 2 O system at 313.15 K were investigated by the method of isothermal solution saturation, and the equilibrium solids were analyzed by Schreinemaker's method of wet residues and verified by XRD. Drowning-out precipitation of KH 2 PO 4 was carried out by mixing different ethanolic aqueous solutions, and crystal morphology was observed by polarizing microscopy. The phase diagrams exhibit one eutonic point, two univariant curves, and crystallization regions corresponding to KCl and KH 2 PO 4 . At all studied ethanol concentrations, the crystallization region of KH 2 PO 4 is larger than that of KCl. The effect of KCl (ethanol) on crystal growth morphology and KH 2 PO 4 product quality was studied.

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On growth rate hysteresis and catastrophic crystal growth

Ferreira

Rocha

Damas

et al. 2013

Journal of Crystal Growth

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Growth kinetics of KH2PO4 crystals in relation to solution macrocomposition

Cited by 4 publications

References 14 publications

Direct in situ ATR-IR spectroscopy of structural dynamics of NH4H2PO4 in aqueous solution

Direct in situ ATR-IR spectroscopy of structural dynamics of NH4H2PO4 in aqueous solution

KH₂PO₄ Production by Cooling Crystallization Using Its Phase Equilibrium in the KH₂PO₄‐KCl‐C₂H₅OH‐H₂O System

On growth rate hysteresis and catastrophic crystal growth

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Growth kinetics of KH2PO4 crystals in relation to solution macrocomposition

Cited by 4 publications

References 14 publications

Direct in situ ATR-IR spectroscopy of structural dynamics of NH4H2PO4 in aqueous solution

Direct in situ ATR-IR spectroscopy of structural dynamics of NH4H2PO4 in aqueous solution

KH2PO4 Production by Cooling Crystallization Using Its Phase Equilibrium in the KH2PO4‐KCl‐C2H5OH‐H2O System

On growth rate hysteresis and catastrophic crystal growth

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KH₂PO₄ Production by Cooling Crystallization Using Its Phase Equilibrium in the KH₂PO₄‐KCl‐C₂H₅OH‐H₂O System