A Mathematical Model to Predict CO2 Removal in Hollow Fiber Membrane Oxygenators

2008 ◽  
Vol 36 (6) ◽  
pp. 992-1003 ◽  
Author(s):  
R. G. Svitek ◽  
W. J. Federspiel
Keyword(s):  
Mathematical Model ◽  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Co2 Removal ◽  
Fiber Membrane ◽  
Membrane Oxygenators

scholarly journals Use of a Mathematical Model to Predict Oxygen Transfer Rates in Hollow Fiber Membrane Oxygenators

ASAIO Journal ◽  
1994 ◽  
Vol 40 (4) ◽  
pp. 990-996 ◽  
Author(s):  
Steven N. Vaslef ◽  
Lyle F. Mockros ◽  
Robert W. Anderson ◽  
Ronald J. Leonard
Keyword(s):  
Mathematical Model ◽  
Hollow Fiber ◽  
Oxygen Transfer ◽  
Hollow Fiber Membrane ◽  
Fiber Membrane ◽  
Transfer Rates ◽  
Membrane Oxygenators

Use of a Mathematical Model to Predict Oxygen Transfer Rates in Hollow Fiber Membrane Oxygenators

ASAIO Journal ◽  
1994 ◽  
Vol 40 (4) ◽  
pp. 990-996 ◽  
Author(s):  
Steven N. Vaslef ◽  
Lyle F. Mockros ◽  
Robert W. Anderson ◽  
Ronald J. Leonard
Keyword(s):  
Mathematical Model ◽  
Hollow Fiber ◽  
Oxygen Transfer ◽  
Hollow Fiber Membrane ◽  
Fiber Membrane ◽  
Transfer Rates ◽  
Membrane Oxygenators

scholarly journals CO2 Absorption Using Hollow Fiber Membrane Contactors: Introducing pH Swing Absorption (pHSA) to Overcome Purity Limitation

Membranes ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 496
Author(s):  
Sayali Ramdas Chavan ◽  
Patrick Perré ◽  
Victor Pozzobon ◽  
Julien Lemaire
Keyword(s):  
Hollow Fiber ◽  
Recovery Rate ◽  
Hollow Fiber Membrane ◽  
Operating Conditions ◽  
Co2 Removal ◽  
Co2 Absorption ◽  
Fiber Membrane ◽  
Residual Content ◽  
Membrane Contactors ◽  
Ph Swing

Recently, membrane contactors have gained more popularity in the field of CO2 removal; however, achieving high purity and competitive recovery for poor soluble gas (H2, N2, or CH4) remains elusive. Hence, a novel process for CO2 removal from a mixture of gases using hollow fiber membrane contactors is investigated theoretically and experimentally. A theoretical model is constructed to show that the dissolved residual CO2 hinders the capacity of the absorbent when it is regenerated. This model, backed up by experimental investigation, proves that achieving a purity > 99% without consuming excessive chemicals or energy remains challenging in a closed-loop system. As a solution, a novel strategy is proposed: the pH Swing Absorption which consists of manipulating the acido–basic equilibrium of CO2 in the absorption and desorption stages by injecting moderate acid and base amount. It aims at decreasing CO2 residual content in the regenerated absorbent, by converting CO2 into its ionic counterparts (HCO3− or CO32−) before absorption and improving CO2 degassing before desorption. Therefore, this strategy unlocks the theoretical limitation due to equilibrium with CO2 residual content in the absorbent and increases considerably the maximum achievable purity. Results also show the dependency of the performance on operating conditions such as total gas pressure and liquid flowrate. For N2/CO2 mixture, this process achieved a nitrogen purity of 99.97% with a N2 recovery rate of 94.13%. Similarly, for H2/CO2 mixture, a maximum H2 purity of 99.96% and recovery rate of 93.96% was obtained using this process. Moreover, the proposed patented process could potentially reduce energy or chemicals consumption.

Experimental and Modeling Study of Trace CO2 Removal in a Hollow-Fiber Membrane Contactor, Using CO2-Loaded Monoethanolamine

2013 ◽  
Vol 52 (50) ◽  
pp. 18059-18070 ◽  
Author(s):  
Zhen Wang ◽  
Mengxiang Fang ◽  
Hai Yu ◽  
Chiao-Chien Wei ◽  
Zhongyang Luo
Keyword(s):  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Co2 Removal ◽  
Membrane Contactor ◽  
Fiber Membrane ◽  
Modeling Study

scholarly journals Computation of Global and Local Mass Transfer in Hollow Fiber Membrane Modules

2020 ◽  
Vol 12 (6) ◽  
pp. 2207
Author(s):  
Benjamin Lukitsch ◽  
Paul Ecker ◽  
Martin Elenkov ◽  
Christoph Janeczek ◽  
Bahram Haddadi ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Three Dimensional ◽  
Co2 Removal ◽  
Fiber Membrane ◽  
Separation Processes ◽  
Flexible Tool ◽  
Species Transport ◽  
Flow Simulations

Computational fluid dynamics (CFD) provides a flexible tool for investigation of separation processes within membrane hollow fiber modules. By enabling a three-dimensional and time dependent description of the corresponding transport phenomena, very detailed information about mass transfer or geometrical influences can be provided. The high level of detail comes with high computational costs, especially since species transport simulations must discretize and resolve steep gradients in the concentration polarization layer at the membrane. In contrast, flow simulations are not required to resolve these gradients. Hence, there is a large gap in the scale and complexity of computationally feasible geometries when comparing flow and species transport simulations. A method, which tries to cover the mentioned gap, is presented in the present article. It allows upscaling of the findings of species transport simulations, conducted for reduced geometries, on the geometrical scales of flow simulations. Consequently, total transmembrane transport of complete modules can be numerically predicted. The upscaling method does not require any empirical correlation to incorporate geometrical characteristics but solely depends on results acquired by CFD flow simulations. In the scope of this research, the proposed method is explained, conducted, and validated. This is done by the example of CO2 removal in a prototype hollow fiber membrane oxygenator.

Reduction of Platelet Trapping in Membrane Oxygenators by Transmembraneous Application of Gaseous Nitric Oxide

1996 ◽  
Vol 19 (5) ◽  
pp. 291-293 ◽  
Author(s):  
D. Keh ◽  
M. Gerlach ◽  
I. Kürer ◽  
K.J. Falke ◽  
H. Gerlach
Keyword(s):  
Nitric Oxide ◽  
Extracorporeal Circulation ◽  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Fiber Membrane ◽  
Systemic Heparinization ◽  
Membrane Oxygenators

Bleeding during extracorporeal circulation (ECC) is often induced and/or aggravated by thrombocytopenia due to platelet-trapping in hollow fiber membrane oxygenators (HFMO). Nitric oxide (NO) has platelet anti-aggregating and dis-aggregating properties. In a paired system we tested whether gaseous NO, added to the gas compartment of one of two parallel running heparin-bonded HFMO attenuated platelet-trapping. Platelet consumption was markedly reduced in the NO-treated HFMO. These data strongly indicate that the application of gaseous NO could prove a new therapeutical approach to reduce bleeding during ECC, serving as a new way of preventing platelet loss, thus reducing the need for high systemic heparinization.

Sign in / Sign up

Export Citation Format

Share Document