scholarly journals EXTERNAL DIFFUSION KINETICS OF MASS TRANSFER. FEATURES OF KINETICS OF ADSORPTION

2020 ◽  
Vol 0 (2) ◽  
pp. 49-56
Author(s):  
Y. Gumnitsky ◽  
D. Symak ◽  
V. Sabadash ◽  
V. Atamanyuk
Keyword(s):  
Mass Transfer ◽  
Diffusion Kinetics ◽  
Kinetics Of Adsorption ◽  
External Diffusion ◽  
Kinetics Of

Study on the diffusion kinetics of adsorption of heavy rare earth with Cyanex272-P507 impregnated resin

2010 ◽  
Vol 28 ◽  
pp. 120-124 ◽  
Author(s):  
Chunfa LIAO ◽  
Huaping Nie ◽  
Yunfen JIAO ◽  
Yong LIANG ◽  
Shaohua YANG
Keyword(s):  
Rare Earth ◽  
Diffusion Kinetics ◽  
Heavy Rare Earth ◽  
Kinetics Of Adsorption ◽  
Impregnated Resin ◽  
Kinetics Of

Some inverse problems of internal-diffusion kinetics of adsorption

1993 ◽  
Vol 66 (4) ◽  
pp. 2387-2390 ◽  
Author(s):  
I. P. Gavrilyuk ◽  
P. F. Zhuk ◽  
L. N. Bondarenko
Keyword(s):  
Inverse Problems ◽  
Internal Diffusion ◽  
Diffusion Kinetics ◽  
Kinetics Of Adsorption ◽  
Kinetics Of

scholarly journals KINETICS OF ADSORPTION OF 4,4-DIMETHYL-1,3-DIOXANE FROM AQUEOUS SOLUTIONS BY SYNTHETIC ZEOLITES IN PRESENCE OF PHOSPHORIC ACID

2018 ◽  
Vol 61 (12) ◽  
pp. 81-86
Author(s):  
Grygoriy A. Ovchinnikov ◽  
Valentina А. Gorskikh ◽  
Ilyana I. Fassalovа ◽  
Vadim S. Тukhvatshin ◽  
Rifkat F. Talipov
Keyword(s):  
Mass Transfer ◽  
Phosphoric Acid ◽  
Aqueous Solutions ◽  
Pore Diameter ◽  
Second Order ◽  
Kinetics Of Adsorption ◽  
Equilibrium Time ◽  
Pseudo Second Order ◽  
Synthetic Zeolites ◽  
Kinetics Of

In this paper we studied the kinetics of adsorption of 4,4-dimethyl-1,3-dioxane by synthetic zeolites from aqueous solutions in the presence of phosphoric acid. Kinetic mechanism of DMD adsorption from aqueous solutions by synthetic zeolites were considered from the position of three kinetic models: the diffusion model (Boyd and Morris-Weber model), Lagergeren (pseudo-first order), and pseudo-second order. As sorbents we have used synthetic zeolites KA, NaA, CaA, CaX, NaX with a pore diameter of 3-9 Å. DMD (boiling point is 113-114 ºC) was synthesized from isobutylene. Chromatographic analysis was performed on Chromatec Crystal 5000.1 instrument (Russia) using columns (2.0 m in length) with silicone SE-30 (5%) stationary phase (0.16–0.20 mm, operating temperature is 50–220 °C) with nitrogen as a carrier gas. An adsorption of DMD from aqueous solutions was investigated at (75±1) °C from a limited volume under constant mixing (laboratory mechanical stirrer, 17 rps). The contact time of the solution with samples of sorbents varied from 120 to 3600 s. The DMD concentration in solution was determined by the chromatographic method (the internal standard is 4,4,5-trimethyl-1,3-dioxane). The values of the external and internal mass transfer diffusion coefficients were obtained. The effect of the size of zeolite’s pores on the contribution of the external or internal diffusion mass transfer in the process of adsorption of 4,4-dimethyl-1,3-dioxane was founded. The time of establishment of sorption equilibrium was determined. We have found that the process of adsorption of DMD by synthetic zeolites in the presence of phosphoric acid is determined by the values of the diameter of the pores. It is shown that the value of pore diameter of synthetic zeolites does not influence on the аdsorption equilibrium time of DMD. The adsorption equilibrium time for all used family zeolites is 900 s. The kinetics of adsorption of DMD on synthetic zeolites can be correctly described by a pseudo-second-order equation, which indicates the presence of sorbate (DMD) interaction with the sorbent (synthetic zeolite).

Simulation of ion exchange interaction kinetics in the clinoptylolite - ammonium ion system

2021 ◽  
Vol 6 (4) ◽  
pp. 233-237
Author(s):  
Vira Sabadash ◽  
◽  
Jaroslaw Gumnitsky ◽  
Sofia Omelyanova ◽  
◽  
...  
Keyword(s):  
Mathematical Model ◽  
Mass Transfer ◽  
Ion Exchange ◽  
Rate Constants ◽  
Internal Diffusion ◽  
Ammonium Ion ◽  
Ammonium Ions ◽  
Kinetics Of Adsorption ◽  
Interaction Kinetics ◽  
Kinetics Of

The kinetics of adsorption of ammonium ions under dynamic conditions has been studied. A mathematical model of the process was built. The mass transfer coefficient was calculated depending on the intensity of the change of location. It was established that ion exchange occurs in external and internal diffusion regions. The rate constants of ion exchange for the region of external and internal diffusion were calculated.

External diffusion kinetics of the adsorption of anionic red 8C dye on glauconite

2013 ◽  
Vol 47 (2) ◽  
pp. 144-148 ◽  
Author(s):  
I. M. Petrushka ◽  
Ya. M. Gumnitskii ◽  
M. S. Malovanyi
Keyword(s):  
Diffusion Kinetics ◽  
External Diffusion ◽  
Kinetics Of

Kinetics of Methane-Oxidizing Biofilms for Degradation of Toxic Organics

1988 ◽  
Vol 20 (11-12) ◽  
pp. 167-173 ◽  
Author(s):  
S. E. Strand ◽  
R. M. Seamons ◽  
M. D. Bjelland ◽  
H. D. Stensel
Keyword(s):  
Chlorinated Hydrocarbons ◽  
Enzymatic Oxidation ◽  
Diffusion Kinetics ◽  
Toxic Compound ◽  
Biofilm Model ◽  
Uptake Rates ◽  
Substrate Diffusion ◽  
Toxic Organics ◽  
Competitive Substrate ◽  
Kinetics Of

The kinetics of methane-oxidizing bioreactors for the degradation of toxic organics are modeled. Calculations of the fluxes of methane and toxic chlorinated hydrocarbons were made using a biofilm model. The model simulated the effects of competition by toxics and mediane on their enzymatic oxidation by the methane monooxygenase. Dual-competitive-substrate/diffusion kinetics were used to model biofilm co-metabolism, integrating equations of the following form:where S1 and S2 are the local concentrations of methane and toxic compound, respectively, and r and K are the maximum uptake rates and Monod coefficients, and x is the distance into the biofilm.

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