Effect of surface profiling of a cation-exchange membrane on the phenylalanine and NaCl separation performances in diffusion dialysis

Васильева, В. И.; Голева, Е. А.; Pismenskaya, Natalia; Kozmai, Anton; Nikonenko, Victor

doi:10.1016/j.seppur.2018.07.065

Cited by 36 publications

(29 citation statements)

References 49 publications

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“…This amino acid was characterized by relatively low diffusion fluxes in thin homogeneous membranes [29]. As it was shown by Vasil'eva et al [22] the flux of phenylalanine species through the relatively thick MK-40 prof membrane (which was used in the current study) is two orders of magnitude lower than that of the salt ions. Thus, for the sake of simplicity, we assumed the constant phenylalanine concentration in the desalination circuit, i.e., there is no transport of Phe species through the membranes and adjacent diffusion layers.…”

Section: System Under Studymentioning

confidence: 49%

Section: Each Of the Circuits That Formed By Corresponding Compartmenmentioning

confidence: 67%

“…The ND elementary cell (Figure 1) contained heterogeneous cation (MK-40 prof ) and anion-exchange (MA-40 prof ) membranes with a profiled surface. Detailed characteristics of the profile on the surface of studied membranes are presented in [22]. The basic characteristics of these membranes are presented in Table 1.…”

Section: Methodsmentioning

confidence: 99%

“…Further, the problem was solved numerically after the substitution of Equations (24)- (29) into the Nernst-Planck equations (1) taking into account boundary conditions (22) and (23) and Equations (4) and (10)- (12).…”

Section: Problem Formulationmentioning

confidence: 99%

“…A number of works are devoted to DD modeling, for example [16][17][18][19][20]. In some of them attempts are made to describe the diffusion and convective transport of molecular and ionic forms of substances through ion exchange membranes (IEM) and adjacent diffusion layers [21], to take into account the facilitated transport of amino acids through CEM being in H + form [22], or, using the enhancement factor for some model parameters, to take into account chemical reaction between components that diffuse through the IEM in opposite directions [23].…”

Section: Introductionmentioning

confidence: 99%

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Neutralization Dialysis for Phenylalanine and Mineral Salt Separation. Simple Theory and Experiment

et al. 2019

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A simple non-steady state mathematical model is proposed for the process of purification of an amino acid solution from mineral salts by the method of neutralization dialysis (ND), carried out in a circulating hydrodynamic mode. The model takes into account the characteristics of membranes (thickness, exchange capacity and electric conductivity) and solution (concentration and components nature) as well as the solution flow rate in dialyzer compartments. In contrast to the known models, the new model considers a local change in the ion concentration in membranes and the adjacent diffusion layers. In addition, the model takes into consideration the ability of the amino acid to enter the protonation/deprotonation reactions. A comparison of the results of simulations with experimental data allows us to conclude that the model adequately describes the ND of a strong electrolyte (NaCl) and amino acid (phenylalanine) mixture solutions in the case where the diffusion ability of amino acids in membranes is much less, than mineral salts. An example shows the application of the model to predict the fluxes of salt ions through ion exchange membranes as well as pH of the desalination solution at a higher than in experiments flow rate of solutions in ND dialyzer compartments.

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Section: System Under Studymentioning

confidence: 49%

Section: Each Of the Circuits That Formed By Corresponding Compartmenmentioning

confidence: 67%

Section: Methodsmentioning

confidence: 99%