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Kun Zhou - One of the best experts on this subject based on the ideXlab platform.
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solid liquid phase equilibrium for the ternary system urea Phosphate Ammonium Dihydrogen Phosphate water at 25 and 55 c
Fluid Phase Equilibria, 2012Co-Authors: Zhaopeng Yang, Jianhong Luo, Pan Wang, Kun ZhouAbstract:Abstract The ternary system of urea Phosphate + Ammonium Dihydrogen Phosphate + water at 25 and 55 °C was investigated by the method of isothermal solution saturation and moist residues. Solubility and density data of the system were determined experimentally, and corresponding phase diagrams were constructed on the basis of solubility data. The solid phase in this system was comfirmed by Schreinemaker's method of wet residue. The trajectories at different temperatures are approximately similar, and the crystallization regions of urea Phosphate and Ammonium Dihydrogen Phosphate increase as the temperature decreases. The solubility data, density, and the phase equilibrium diagrams for the ternary system can provide the fundamental basis for the preparation of urea Phosphate in Ammonium Dihydrogen Phosphate and urea Phosphate aqueous mixtures.
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Solid–liquid phase equilibrium for the ternary system urea Phosphate + Ammonium Dihydrogen Phosphate + water at 25 and 55 °C
Fluid Phase Equilibria, 2012Co-Authors: Zhaopeng Yang, Jianhong Luo, Pan Wang, Kun ZhouAbstract:Abstract The ternary system of urea Phosphate + Ammonium Dihydrogen Phosphate + water at 25 and 55 °C was investigated by the method of isothermal solution saturation and moist residues. Solubility and density data of the system were determined experimentally, and corresponding phase diagrams were constructed on the basis of solubility data. The solid phase in this system was comfirmed by Schreinemaker's method of wet residue. The trajectories at different temperatures are approximately similar, and the crystallization regions of urea Phosphate and Ammonium Dihydrogen Phosphate increase as the temperature decreases. The solubility data, density, and the phase equilibrium diagrams for the ternary system can provide the fundamental basis for the preparation of urea Phosphate in Ammonium Dihydrogen Phosphate and urea Phosphate aqueous mixtures.
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Study on Mg2+ removal from Ammonium Dihydrogen Phosphate solution by solvent extraction with di-2-ethylhexyl phosphoric acid
Korean Journal of Chemical Engineering, 2011Co-Authors: Jianhong Luo, Kun Zhou, Yang JinAbstract:The extraction of Mg2+ from Ammonium Dihydrogen Phosphate (MAP) solution by extractant (D2EHPA) and its mixture, including acidic extractant (HEHPEHE), alkaline extractant (TOA) and neutral extractant (TBP) respectively, is investigated. The good extraction selectivity of Mg2+ with D2EHPA from Ammonium Dihydrogen Phosphate solution is verified, which is found to be associated with the cation exchange and chelation capability of D2EHPA on the basis of its molecular structure. The related thermodynamic data are also obtained in terms of experimental results as follows: the extraction enthalpy is 2.659×10−2 (J·mol−1·K−1), the free energy is 1.501×103 (J·mol−1) and the entropy is 4.441 (J·mol−1). Meanwhile, the major influencing factors, such as the initial pH, the initial concentration of extractant, phase ratio and the extraction temperature on the extraction ratios of Mg2+, are studied, and the optimal process conditions are obtained. As shown in the extraction experiments for practical MAP solution, superior grade MAP can be obtained by three levels of extraction under optimal condition.
Zhaopeng Yang - One of the best experts on this subject based on the ideXlab platform.
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solid liquid phase equilibrium for the ternary system urea Phosphate Ammonium Dihydrogen Phosphate water at 25 and 55 c
Fluid Phase Equilibria, 2012Co-Authors: Zhaopeng Yang, Jianhong Luo, Pan Wang, Kun ZhouAbstract:Abstract The ternary system of urea Phosphate + Ammonium Dihydrogen Phosphate + water at 25 and 55 °C was investigated by the method of isothermal solution saturation and moist residues. Solubility and density data of the system were determined experimentally, and corresponding phase diagrams were constructed on the basis of solubility data. The solid phase in this system was comfirmed by Schreinemaker's method of wet residue. The trajectories at different temperatures are approximately similar, and the crystallization regions of urea Phosphate and Ammonium Dihydrogen Phosphate increase as the temperature decreases. The solubility data, density, and the phase equilibrium diagrams for the ternary system can provide the fundamental basis for the preparation of urea Phosphate in Ammonium Dihydrogen Phosphate and urea Phosphate aqueous mixtures.
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Solid–liquid phase equilibrium for the ternary system urea Phosphate + Ammonium Dihydrogen Phosphate + water at 25 and 55 °C
Fluid Phase Equilibria, 2012Co-Authors: Zhaopeng Yang, Jianhong Luo, Pan Wang, Kun ZhouAbstract:Abstract The ternary system of urea Phosphate + Ammonium Dihydrogen Phosphate + water at 25 and 55 °C was investigated by the method of isothermal solution saturation and moist residues. Solubility and density data of the system were determined experimentally, and corresponding phase diagrams were constructed on the basis of solubility data. The solid phase in this system was comfirmed by Schreinemaker's method of wet residue. The trajectories at different temperatures are approximately similar, and the crystallization regions of urea Phosphate and Ammonium Dihydrogen Phosphate increase as the temperature decreases. The solubility data, density, and the phase equilibrium diagrams for the ternary system can provide the fundamental basis for the preparation of urea Phosphate in Ammonium Dihydrogen Phosphate and urea Phosphate aqueous mixtures.
S.i. Saleh - One of the best experts on this subject based on the ideXlab platform.
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thermal behaviour of Ammonium Dihydrogen Phosphate crystals in the temperature range 25 600 c
Thermochimica Acta, 1991Co-Authors: A Abdelkader, A. A. Ammar, S.i. SalehAbstract:Abstract A slow evaporation technique was used to grow single crystals of Ammonium Dihydrogen Phosphate (ADP) from supersaturated aqueous solutions An identification of crystal structure for as-grown ADP crystals was achieved Simultaneous TG, DTG and DTA showed that the ADP crystals decompose at 210 ° C to orthophosphoric acid with evolution of ammonia The orthophosphoric acid converts to pyrophosphoric acid and then to metaphosphonc acid. A pronounced resolution of the overlap between phase transition, melting and decomposition of ADP crystals was obtained at relatively high heating rates. Differential scanning calorimetry (DSC) confirmed the phase transition in ADP crystals at 175° C Kissinger and Ozawa methods were applied to calculate the activation energies for the thermal processes occurring at 210°C, which are 90.37 kJ mol−1 and 99.12 kJ mol−1 respectively. The phase transitions and thermal decompositions of ADP crystals have been confirmed by X-ray diffraction and infrared absorption spectra.
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Thermal behaviour of Ammonium Dihydrogen Phosphate crystals in the temperature range 25-600° C
Thermochimica Acta, 1991Co-Authors: A. Abdel-kader, A. A. Ammar, S.i. SalehAbstract:Abstract A slow evaporation technique was used to grow single crystals of Ammonium Dihydrogen Phosphate (ADP) from supersaturated aqueous solutions An identification of crystal structure for as-grown ADP crystals was achieved Simultaneous TG, DTG and DTA showed that the ADP crystals decompose at 210 ° C to orthophosphoric acid with evolution of ammonia The orthophosphoric acid converts to pyrophosphoric acid and then to metaphosphonc acid. A pronounced resolution of the overlap between phase transition, melting and decomposition of ADP crystals was obtained at relatively high heating rates. Differential scanning calorimetry (DSC) confirmed the phase transition in ADP crystals at 175° C Kissinger and Ozawa methods were applied to calculate the activation energies for the thermal processes occurring at 210°C, which are 90.37 kJ mol−1 and 99.12 kJ mol−1 respectively. The phase transitions and thermal decompositions of ADP crystals have been confirmed by X-ray diffraction and infrared absorption spectra.
Pan Wang - One of the best experts on this subject based on the ideXlab platform.
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solid liquid phase equilibrium for the ternary system urea Phosphate Ammonium Dihydrogen Phosphate water at 25 and 55 c
Fluid Phase Equilibria, 2012Co-Authors: Zhaopeng Yang, Jianhong Luo, Pan Wang, Kun ZhouAbstract:Abstract The ternary system of urea Phosphate + Ammonium Dihydrogen Phosphate + water at 25 and 55 °C was investigated by the method of isothermal solution saturation and moist residues. Solubility and density data of the system were determined experimentally, and corresponding phase diagrams were constructed on the basis of solubility data. The solid phase in this system was comfirmed by Schreinemaker's method of wet residue. The trajectories at different temperatures are approximately similar, and the crystallization regions of urea Phosphate and Ammonium Dihydrogen Phosphate increase as the temperature decreases. The solubility data, density, and the phase equilibrium diagrams for the ternary system can provide the fundamental basis for the preparation of urea Phosphate in Ammonium Dihydrogen Phosphate and urea Phosphate aqueous mixtures.
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Solid–liquid phase equilibrium for the ternary system urea Phosphate + Ammonium Dihydrogen Phosphate + water at 25 and 55 °C
Fluid Phase Equilibria, 2012Co-Authors: Zhaopeng Yang, Jianhong Luo, Pan Wang, Kun ZhouAbstract:Abstract The ternary system of urea Phosphate + Ammonium Dihydrogen Phosphate + water at 25 and 55 °C was investigated by the method of isothermal solution saturation and moist residues. Solubility and density data of the system were determined experimentally, and corresponding phase diagrams were constructed on the basis of solubility data. The solid phase in this system was comfirmed by Schreinemaker's method of wet residue. The trajectories at different temperatures are approximately similar, and the crystallization regions of urea Phosphate and Ammonium Dihydrogen Phosphate increase as the temperature decreases. The solubility data, density, and the phase equilibrium diagrams for the ternary system can provide the fundamental basis for the preparation of urea Phosphate in Ammonium Dihydrogen Phosphate and urea Phosphate aqueous mixtures.
Jianhong Luo - One of the best experts on this subject based on the ideXlab platform.
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Mass transfer process study of Fe(III) extraction from Ammonium Dihydrogen Phosphate solution
Journal of the Serbian Chemical Society, 2020Co-Authors: Li Weiqi, Jianhong Luo, Hui Liu, Lan SunAbstract: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 E a and K f 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: R f = 0.028 c Fe 3+ 1.2 c H 2 A 2 0.81 c H + -0.85.
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Study on Mg2+ removal from Ammonium Dihydrogen Phosphate solution by an emulsion liquid membrane
Chemical Industry, 2014Co-Authors: Jianhong Luo, Bao Ming WangAbstract:Mg2+is extracted from Ammonium Dihydrogen Phosphate (NH4H2PO4) solution by an emulsion liquid membrane (ELM) using mono-(2-ethylhexyl) 2-ethylhexyl phosphonate (HEHPEHE)as a carrier, sulfonated liquid polybutadiene (LYF) as a surfactant and kerosene as a solvent. To study the extraction efficiency and advantages of the ELM process in the separation of Mg2+,the effects of various operating conditions on the extraction -HEHPEHE volume fraction, reaction temperature, treat ratio (emulsion phase / external phase), phase ratio (membrane phase / internal phase), agitation speed, extraction time, internal phase concentration, surfactant LYF concentration and initial pH of NH4H2PO4 solution are experimentally investigated and discussed. The results show that Mg2+ in NH4H2PO4 solution can be effectively removed by the ELM process. An extraction efficiency of more than 83.1% is attained at the optimized parameters and superior-grade NH4H2PO4can be obtained by two levels of extraction.
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solid liquid phase equilibrium for the ternary system urea Phosphate Ammonium Dihydrogen Phosphate water at 25 and 55 c
Fluid Phase Equilibria, 2012Co-Authors: Zhaopeng Yang, Jianhong Luo, Pan Wang, Kun ZhouAbstract:Abstract The ternary system of urea Phosphate + Ammonium Dihydrogen Phosphate + water at 25 and 55 °C was investigated by the method of isothermal solution saturation and moist residues. Solubility and density data of the system were determined experimentally, and corresponding phase diagrams were constructed on the basis of solubility data. The solid phase in this system was comfirmed by Schreinemaker's method of wet residue. The trajectories at different temperatures are approximately similar, and the crystallization regions of urea Phosphate and Ammonium Dihydrogen Phosphate increase as the temperature decreases. The solubility data, density, and the phase equilibrium diagrams for the ternary system can provide the fundamental basis for the preparation of urea Phosphate in Ammonium Dihydrogen Phosphate and urea Phosphate aqueous mixtures.
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Solid–liquid phase equilibrium for the ternary system urea Phosphate + Ammonium Dihydrogen Phosphate + water at 25 and 55 °C
Fluid Phase Equilibria, 2012Co-Authors: Zhaopeng Yang, Jianhong Luo, Pan Wang, Kun ZhouAbstract:Abstract The ternary system of urea Phosphate + Ammonium Dihydrogen Phosphate + water at 25 and 55 °C was investigated by the method of isothermal solution saturation and moist residues. Solubility and density data of the system were determined experimentally, and corresponding phase diagrams were constructed on the basis of solubility data. The solid phase in this system was comfirmed by Schreinemaker's method of wet residue. The trajectories at different temperatures are approximately similar, and the crystallization regions of urea Phosphate and Ammonium Dihydrogen Phosphate increase as the temperature decreases. The solubility data, density, and the phase equilibrium diagrams for the ternary system can provide the fundamental basis for the preparation of urea Phosphate in Ammonium Dihydrogen Phosphate and urea Phosphate aqueous mixtures.
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Study on Mg2+ removal from Ammonium Dihydrogen Phosphate solution by solvent extraction with di-2-ethylhexyl phosphoric acid
Korean Journal of Chemical Engineering, 2011Co-Authors: Jianhong Luo, Kun Zhou, Yang JinAbstract:The extraction of Mg2+ from Ammonium Dihydrogen Phosphate (MAP) solution by extractant (D2EHPA) and its mixture, including acidic extractant (HEHPEHE), alkaline extractant (TOA) and neutral extractant (TBP) respectively, is investigated. The good extraction selectivity of Mg2+ with D2EHPA from Ammonium Dihydrogen Phosphate solution is verified, which is found to be associated with the cation exchange and chelation capability of D2EHPA on the basis of its molecular structure. The related thermodynamic data are also obtained in terms of experimental results as follows: the extraction enthalpy is 2.659×10−2 (J·mol−1·K−1), the free energy is 1.501×103 (J·mol−1) and the entropy is 4.441 (J·mol−1). Meanwhile, the major influencing factors, such as the initial pH, the initial concentration of extractant, phase ratio and the extraction temperature on the extraction ratios of Mg2+, are studied, and the optimal process conditions are obtained. As shown in the extraction experiments for practical MAP solution, superior grade MAP can be obtained by three levels of extraction under optimal condition.
