A Water–Urea–Ammonium Sulfamate system: Experimental investigation and thermodynamic modelling

Kosova, D. A.; Voskov, A. L.; Коваленко, Н. А.; Uspenskaya, I. A.

doi:10.1016/j.fluid.2016.06.021

Cited by 19 publications

(4 citation statements)

References 62 publications

(36 reference statements)

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“…• For the NH 3 −H 2 O binary system reference data by Tillner-Roth and Friend 44 for T = (293 to 523) K and p = (0.012 to 14.7) MPa have been used. 50 all of them are for t < 135 °C. That temperature is lower than urea synthesis conditions and we did not use them in the model parameters optimization.…”

Section: ∑ ∑mentioning

confidence: 99%

“…Although there are many (about 1000 points) experimental data for the H 2 O–(NH 2 ) 2 CO binary subsystem that are reviewed and used for its thermodynamic modeling by Kosova et al all of them are for t < 135 °C. That temperature is lower than urea synthesis conditions and we did not use them in the model parameters optimization.…”

Section: Parameters Optimization Proceduresmentioning

confidence: 99%

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Thermodynamic Model of the Urea Synthesis Process

Voskov

Voronin

2016

J. Chem. Eng. Data

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A thermodynamic model of the ammonia−carbon dioxide–water–urea system at urea synthesis conditions, that is, at t = (135 to 230) °C, p = (3.5 to 45) MPa, L = n N/n C = (2 to 5.5) and W = ( n H2O – n (NH2)2CO) = n O/n C – 2 = (−0.75 to 1.2) was developed. A liquid phase was described by the UNIQUAC model including urea, ammonium carbamate, and ammonium bicarbonate as compounds; the gas phase was described by a virial equation of state. Bubble point pressures and carbon dioxide to urea conversion data were used for the model parameters optimization. The unique features of the model are the correct description of the saddle azeotrope and intensive use of existing thermodynamic data about constituents and binary subsystems vapor–liquid equilibria data.

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Section: ∑ ∑mentioning

confidence: 99%

Section: Parameters Optimization Proceduresmentioning

confidence: 99%

Thermodynamic Model of the Urea Synthesis Process

Voskov

Voronin

2016

J. Chem. Eng. Data

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“…Ammonium sulfamate is a crystalline ammonium salt of sulfamic acid highly soluble in water [ 14 ]. It can be used as a herbicide [ 15 ], a fire-protecting additive [ 16 ], an additive in the fabrication of cigarette paper [ 17 ], and a deicer [ 18 ]. The physicochemical properties of ammonium sulfamate are being intensively studied to expand its application range [ 19 , 20 , 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

“…In [ 18 ], the eutectic and other thermodynamic properties of a water–urea–ammonium sulfamate system were experimentally examined. The study was based mainly on thermodynamic modeling and, according to the results of the physicochemical analysis, only the differential scanning calorimetry (DSC) data on the solidus–liquidus point were reported.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Study of the Ammonium Sulfamate–Urea Binary System

et al. 2023

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The physicochemical properties of binary systems are of great importance for the application of the latter. We report on the investigation of an ammonium sulfamate–urea binary system with different component ratios using a combination of experimental (FTIR, XRD, TGA/DSC, and melting point) and theoretical (DFT, QTAIM, ELF, RDG, ADMP, etc.) techniques. It is shown that, at a temperature of 100 °C, the system under study remains thermally and chemically stable for up to 30 min. It was established using X-ray diffraction analysis that the heating time barely affects the X-ray characteristics of the system. Data on the aggregate states in specified temperature ranges were obtained with thermal analysis and determination of the melting point. The structures of the ammonium sulfamate–urea system with different component ratios were optimized within the density functional theory. The atom-centered density matrix propagation calculation of the ammonium sulfamate–urea system with different component ratios was performed at temperatures of 100, 300, and 500 K. Regardless of the component ratio, a regular increase in the potential energy variation (curve amplitude) with an increase in temperature from 100 to 500 K was found.

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