scholarly journals Enhancing Oxygen Permeation via the Incorporation of Silver Inside Perovskite Oxide Membranes

Processes ◽  
2019 ◽  
Vol 7 (4) ◽  
pp. 199 ◽  
Author(s):  
Teng Ma ◽  
Ning Han ◽  
Bo Meng ◽  
Naitao Yang ◽  
Zhonghua Zhu ◽  
...  
Keyword(s):  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Clean Energy ◽  
Ceramic Membranes ◽  
Operating Conditions ◽  
Air Separation ◽  
Perovskite Oxide ◽  
Fiber Membrane ◽  
Ion Conducting ◽  
Oxide Membranes

As a possible novel cost-effective method for oxygen production from air separation, ion-conducting ceramic membranes are becoming a hot research topic due to their potentials in clean energy and environmental processes. Oxygen separation via these ion-conducting membranes is completed via the bulk diffusion and surface reactions with a typical example of perovskite oxide membranes. To improve the membrane performance, silver (Ag) deposition on the membrane surface as the catalyst is a good strategy. However, the conventional silver coating method has the problem of particle aggregation, which severely lowers the catalytic efficiency. In this work, the perovskite oxide La0.8Ca0.2Fe0.94O3−a (LCF) and silver (5% by mole) composite (LCFA) as the membrane starting material was synthesized using one-pot method via the wet complexation where the metal and silver elements were sourced from their respective nitrate salts. LCFA hollow fiber membrane was prepared and comparatively investigated for air separation together with pure LCF hollow fiber membrane. Operated from 800 to 950 °C under sweep gas mode, the pure LCF membrane displayed the fluxes from 0.04 to 0.54 mL min−1 cm−2. Compared to pure LCF, under similar operating conditions, the flux of LCFA membrane was improved by 160%.

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.

Perovskite oxide based composite hollow fiber membrane for CO2 transport

2020 ◽  
Vol 46 (2) ◽  
pp. 2538-2544 ◽  
Author(s):  
Shujuan Zhuang ◽  
Ning Han ◽  
Ruofei Chen ◽  
Zhengxin Yao ◽  
Qingchuan Zou ◽  
...  
Keyword(s):  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Perovskite Oxide ◽  
Fiber Membrane ◽  
Co2 Transport

The effect of operating conditions on the performance of hollow fiber membrane modules for CO2/N2 separation

2012 ◽  
Vol 18 (1) ◽  
pp. 205-211 ◽  
Author(s):  
Hae Young Hwang ◽  
Sang Yong Nam ◽  
Hyung Chul Koh ◽  
Seong Yong Ha ◽  
Giuseppe Barbieri ◽  
...  
Keyword(s):  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Operating Conditions ◽  
Fiber Membrane ◽  
Membrane Modules

Simulation and sensitivity analysis of transport in asymmetric hollow fiber membrane permeators for air separation

RSC Advances ◽  
2015 ◽  
Vol 5 (105) ◽  
pp. 86359-86370 ◽  
Author(s):  
Seyed Saeid Hosseini ◽  
Sara Najari ◽  
Prodip K. Kundu ◽  
Nicolas R. Tan ◽  
Seyed Mehrdad Roodashti
Keyword(s):  
Sensitivity Analysis ◽  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Air Separation ◽  
Fiber Membrane ◽  
Operational Conditions ◽  
Separation Membrane

Development of advanced membranes requires deep insights about the process. Sensitivity analysis is performed to analyze the effects of module properties and process operational conditions on the performance of air separation membrane permeators.

Controlled Atmosphere Systems for Marine Vessels

1995 ◽  
Vol 32 (02) ◽  
pp. 147-150
Author(s):  
Mike Harrison ◽  
Peter Herlihy
Keyword(s):  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Natural Extension ◽  
Fruit And Vegetables ◽  
Air Separation ◽  
Controlled Atmosphere ◽  
Fiber Membrane ◽  
Cut Flowers ◽  
Low Oxygen ◽  
Chemical Company

Controlled atmosphere (CA) preservation of perishable fruit and vegetables represents new opportunities for today's reefer operators. This technology affords the carrier an efficient and economical method of introducing and maintaining a low oxygen atmosphere that, when used in conjunction with temperature control, can significantly enhance the preservation of fruit and vegetables. Improved product quality, new markets, and reduced product losses are benefits realized through the use of hollow fiber membrane air separation technology. Seasonal products, which may be unavailable because of the transit time of shipping, are now a reality for operators utilizing this technology. High-value products such as fresh cut flowers, previously dedicated to air freight, may be a natural extension of the technology. The authors' company is a wholly owned subsidiary of The Dow Chemical Company. Generon supplies hollow fiber membrane systems for the on-site generation of gaseous nitrogen. In 1992 the company provided turnkey design and installation services of controlled atmosphere systems for three fully refrigerated containerships operated by the Great White Fleet. These ABS-classed vessels were the first of their type to fully utilize controlled atmosphere technology for the improved quality and reduction of perishable losses.

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