Modeling of CO₂ mass transport across a hollow fiber membrane reactor filled with immobilized enzyme

Abstract

in Wiley Online Library (wileyonlinelibrary.com).The enzyme-based contained liquid membrane reactor to capture CO 2 from the closed spaces is a very complicated process with large numbers of interdependent variables. A theoretical and experimental analysis of facilitated transport of CO 2 across a hollow fiber membrane reactor filled with immobilized carbonic anhydrase (CA) by nanocomposite hydrogel was presented. CO 2 concentration profiles in the feed gas phase and the membrane wall were achieved by numeric simulation. The effects of CO 2 concentration, CA concentration, and flow rate of feed gas on CO 2 removal performance were studied in detail, and the model solution agrees with the experimental data with a maximum deviation of up to 18.7%. Moreover, the effect of CO 2 concentration on the required membrane areas for the same CO 2 removal target (1 kg/day) was also investigated. This could provide real-world data and scientific basis for future development toward a final efficient CO 2 removal device.

Modelling, simulation, and membrane wetting estimation in gas‐liquid contacting processes

“…It is worth mentioning that there is also a recent publication presenting an analytical solution for the linear boundary condition case (Case A); however, as Bizmark and Ioannidis noted, the latter solution is only valid for sufficiently small values of N Gz and Sh w . Nevertheless, for physical absorption cases the analytical solution by Zhang et al can still be applied since the values of the aforementioned dimensionless numbers are very small, as it is shown in subsequent sections of the current paper.…”

“…Assuming that the concentration of the diffusing component in the shell‐side is constant (Case A), a linear boundary condition of Robin type (mixed Neumann and Dirichlet) at the fibre wall may arise; for Case A analytical solutions exist for the entrance region derived by similarity transformation, or Laplace transformation, and for the remaining of the tube by the separation of variables method . Model formulations for gas‐liquid membrane systems with no reacting conditions in the lumen, Robin‐type boundary conditions at r = R f , and constant shell‐side concentration can be found elsewhere, where concentration difference is also assumed, and in other studies, where shell‐side concentration is assumed to be zero. If a reaction takes place in the lumen side a reaction‐rate term must be added in the RHS of Equations and (9) …”

Experimental and numerical investigation binary mixture mass transfer in a gas – Liquid membrane contactor

“…Even though this approach was successfully used by authors, they were working in conditions where the liquid resistance was the limiting one and with membrane exhibiting much larger pores [34,[51][52][53]. Hence this description is in the general case be far too simplistic.…”

Reply to the Letter to the Editor

“…In this letter, we respond to the points raised by Bizmark and Ioannidis in their letter commenting on our article ''Modeling of CO 2 mass transport across a hollow fiber membrane reactor filled with immobilized enzyme''. 1 We appreciate the detailed attention that Bizmark and Ioannidis have paid to our work and their comments on the mass-transfer model. Below is our response to their comments.…”