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530 results on '"Bazhenov, S."'

19. Membrane-Based Deoxygenation of an Alkanolamine Absorbent of CO2: Formation of Composite Membranes and Influence of the Turbulators of the Liquid Phase in Them on Their Characteristics.

Author

Kalmykov, D. O., Lagutin, P. G., Tsoi, A. V., Volkov, A. V., and Bazhenov, S. D.

Subjects
CHEMICAL engineering, COMBUSTION gases, POLYMER blends, CHEMICAL engineers, LIQUID membranes
Abstract

The process of removal of the oxygen dissolved in a monoethanolamine-based absorbent from it in gas–liquid membrane contactors for the prevention of the oxidation destruction of this absorbent in the case of its use for the absorption removal of carbon dioxide from the combustion gases was investigated. The influence of the parameters of formation of composite membranes on the basis of porous tubular ceramic substrates with a thin selective nonporous polymer layer of a mixture of poly[1-(trimethylsilyl)-1-propyne] and poly(vinyl trimethylsilane) on their gas-transfer properties was determined. With the use of the membranes obtained, the process of removal of the oxygen dissolved in the aqueous solutions of monoethanolamine from them was realized. The possibility of intensification of this process with the use of a flow turbulator installed in the liquid part of a membrane contactor was demonstrated. [ABSTRACT FROM AUTHOR]

Published
2024
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33. Deoxygenation of a CO2Absorbent Based on Monoethanolamine in Gas–Liquid Membrane Contactors: Dynamic Process Modeling

Author

Kalmykov, D. O., Shirokih, S. A., Matveev, D. N., Petrova, I. V., and Bazhenov, S. D.

Abstract

Abstract—: The study focuses on the removal of dissolved oxygen from a model monoethanolamine (MEA)-based absorbent to prevent oxidative degradation during the absorption process of flue gas CO2removal. A mathematical model was developed to evaluate the deoxygenation parameters in a gas-liquid membrane contactor using composite hollow-fiber membranes with a thin non-porous layer made of a blend of polytrimethylsilylpropyne and polyvinyltrimethylsilane. The modeling results were shown to be in good agreement with experimental data on O2removal efficiency. The model was applied to assess the scaling of the membrane system for dissolved O2removal to handle an absorbent flow rate of 120 m3/h in a hypothetical CO2capture plant using absorption technology. The influence of system parameters (absorbent linear flow rate, membrane contactor length, number of membranes in the contactor, initial O2concentration in the absorbent) on O2removal efficiency was determined. It was shown that to achieve 90% removal of dissolved oxygen, at least 12 membrane modules with a length of 1 meter and a total membrane area of 1800 m2are required. Various scenarios of dynamically changing external system parameters (oxygen concentration in the feed, absorbent flow rate) were simulated for the designed membrane system to predict the system’s response.

Published
2024
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46. Influence of Deformation of Metal Matrix on the Mechanical Properties of Poly(Ethylene Terephthalate) Inside It.

Author

Kechek'yan, A. S., Bazhenov, S. L., Monakhova, K. Z., and Kurkin, T. S.

Subjects
*MECHANICAL properties of metals, *STRAIN hardening, *LEAD-tin alloys, *DEFORMATIONS (Mechanics), *POLYETHYLENE terephthalate, *DRAWING (Metalwork), *POLYMERS
Abstract

The influence of different types of deformation of the metal matrix on mechanical behavior of the amorphous PET film upon its transverse compression in the ductile metal matrix has been investigated. Three deformation modes have been probed. In the first case, a disc-shaped polymer specimen has been put between two 5 mm thick discs of the lead–tin alloy and squeezed in the press. In the second and the third cases, planar elongation has been performed in the so called "dead channel", i.e., the channel with fixed side walls, the film being elongated due to decrease in the width or thickness, respectively. The plots of true yield stress at different draw ratios have formed a common master curve. At high total draw ratio Λ, the true yield stresses have been close for the considered three types of drawing in the metal. At the draw ratio Λ > 2.6, the neck has not appeared, and the specimen has been deformed uniformly. When the film in the channel is elongated due to the decrease in thickness at constant width, the specimen width has been mainly decreased during subsequent elongation in the testing machine. When the film in the channel is elongated due to the decrease in width at constant thickness, further elongation has mainly led to the decrease in the specimen thickness. The true stress Σ has been expressed as Σ = Σ0 + KΛ3, with K being a constant. Deformation of the polymer in the channel occurred with the formation of shear bands. At the preliminary draw ratio Λ = 1.82, the bands have been oriented at the angle 21.5° with respect to the stretching axis. The planar elongation has led to abnormally strong deformation softening of the polymer. The drawing has been accompanied by an increase in the elasticity modulus of the polymer. The obtained results have suggested that the macromolecules orientation is the main reason for strain hardening of the polymer. [ABSTRACT FROM AUTHOR]

Published
2023
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