Distributions of Pressure and Flow Rate in a Hollow-Fiber Membrane Bioartificial Liver

2005 ◽  
Vol 38 (9) ◽  
pp. 684-687
Author(s):  
Shiro Yoshikawa ◽  
Shunsuke Ogihara
Keyword(s):  
Flow Rate ◽  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Bioartificial Liver ◽  
Fiber Membrane

0711 Effects of fresh water flow rate on the performance of hollow fiber membrane module

2014 ◽  
Vol 2014 (0) ◽  
pp. _0711-1_-_0711-4_
Author(s):  
Shingo TERASHIMA ◽  
Hidechito HAYASHI ◽  
Tetsuya OKUMURA ◽  
Kei MATSUYAMA ◽  
Morihiro IRIE ◽  
...  
Keyword(s):  
Fresh Water ◽  
Water Flow ◽  
Flow Rate ◽  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Water Flow Rate ◽  
Membrane Module ◽  
Fiber Membrane

scholarly journals Optimization of CO2Absorption Characteristic under the Influence of SO2in Flue Gas by Hollow Fiber Membrane Contactor

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Ziyi Qu ◽  
Li Zhang ◽  
Yunfei Yan ◽  
Shunxiang Ju
Keyword(s):  
Flow Rate ◽  
Hollow Fiber ◽  
Flue Gas ◽  
Gas Flow ◽  
Hollow Fiber Membrane ◽  
Flow Rate Ratio ◽  
Absorption Characteristic ◽  
Membrane Contactor ◽  
Gas Flow Rate ◽  
Fiber Membrane

Hollow fiber membrane contactor is a new, highly efficient, and the most promising technology for CO2absorption in flue gas. There is still SO2that exists in the flue gas after desulfurization tower of power plant. This paper studied the influence of SO2on CO2absorption characteristic in flue gas by hollow fiber membrane contactor with absorbent of EDA, EDA + MEA (0.6 : 0.4), and EDA + MEA + PZ (0.4 : 0.4 : 0.2). The influences of SO2concentration, cycle absorption and desorption characteristic of absorbent, absorbent concentration, and liquid-gas flow rate ratio are studied to analyze the influence of SO2on CO2absorption characteristic. The appropriate absorbent composition ratio and appropriate parameter range that can inhibit the influence of SO2are proposed by studying the hybrid sorbent with activating agent, appropriate absorbent concentration, and ratio of liquid-gas flow rate. Among the three kinds of absorbents, EDA + MEA + PZ (0.4 : 0.4 : 0.2) had the best tolerance ability to SO2and the highest efficiency. With comprehensive consideration of CO2removal efficiency and operating cost, under the condition of 1000 ppm SO2, the appropriate concentration and liquid-gas flow rate ratio of EDA, EDA + MEA, and EDA + MEA + PZ are proposed.

scholarly journals Effects of Operating and Structural Parameters on Removal of Nitric Oxide by Oxidation in a Ceramic Hollow Fiber Membrane Contactor

Membranes ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 704
Author(s):  
Wei Yu ◽  
Xiaoyin Li ◽  
Fangyang Yuan
Keyword(s):  
Nitric Oxide ◽  
Flow Rate ◽  
Hollow Fiber ◽  
Operating Temperature ◽  
Hollow Fiber Membrane ◽  
Membrane Contactor ◽  
Fiber Membrane ◽  
Gas Channel ◽  
Membrane Tube ◽  
Reduction Efficiency

A numerical study on the oxidation removal of nitric oxide in a ceramic hollow fiber membrane contactor was performed. To represent the transport and absorption process, the model was created by combining multiphase, species, reaction, and porous models. The numerical results were verified by comparing them with experimental data. The tube and lumen sides both have laminar parabolic velocity distributions. The nitric oxide concentration decreases gradually from the membrane wall to axis at the cross-section except on the inner and outer sides of the membrane tube. The equivalent diffusion length was proved useful for evaluating the entrance effect. At low concentrations, the reduction efficiency was proportional to the absorbent concentration, and at large concentrations, it neared a maximum value. The reduction efficiency was positively affected by elevated operating temperature and pressure. With a gas channel width of 13 mm, the reduction flow rate achieves its maximum. The efficiency of NO reduction per area decreases as the effective membrane length increases. Increasing the operating temperature and membrane length are recommended as design priorities due to high relative enhancements. It is not recommended to improve reduction efficiency by increasing membrane tube diameter and operating pressure in design. Changing the gas flow rate, absorbent concentration and gas channel width are moderate recommended as well.

scholarly journals Long-Term Stability of PVDF-SiO2-HDTMS Composite Hollow Fiber Membrane For Carbon Dioxide Absorption in Gas–Liquid Contacting Process

2021 ◽  
Author(s):  
Honglei Pang ◽  
Yayu Qiu ◽  
Weipeng Sheng
Keyword(s):  
Carbon Dioxide ◽  
Flow Rate ◽  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Inorganic Nanoparticles ◽  
Inversion Method ◽  
Stable Operation ◽  
Fiber Membrane ◽  
Operation Performance

Abstract To obtain a long-term stable operation of the hollow fiber membrane for using in membrane contact absorption of carbon dioxide (CO2), hybrid polyvinylidene fluoride-silica-hexadecyltrimethoxysilane (PVDF-SiO2-HDTMS) membrane were fabricated via the non-solvent induced phase-inversion method. The surface properties, performance characteristics and long-term stable operation performance of the prepared membranes were compared and analyzed. The results show the outer surface of the prepared membranes exhibited superhydrophobicity because of the formation of rough nano-scale microstructures and the low surface free energy. Due to the addition of inorganic nanoparticles, the mechanical strength of PVDF-SiO2-HDTMS membranes were improved. The long-term stable operation experiments were carried out with the inlet gas (CO2/N2 = 19/81, v/v) at a flow rate of 20 mL/min and the absorbent liquid (1 mol/L DEA) at a flow rate of 50 mL/min. And the result showed that the mass transfer flux of PVDF-SiO2-HDTMS membrane decreased from the initial value of 2.39×10-3 mol/m2s to 2.31×10-3 mol/m2s, which was a decrease of 3% after 20 days. The main benefit is the addition of inorganic nanoparticles, which have strong chemical resistance and high hydrophobicity, thereby preventing structural damage and pore wetting of the membrane. PVDF-SiO2-HDTMS membrane exhibits excellent long-term stable operation performance of CO2.

scholarly journals Effect of flow and module configuration on SO2 absorption by using membrane contactors

2018 ◽  
Vol 19 (4) ◽  
pp. 716-725 ◽  
Keyword(s):  
Liquid Phase ◽  
Phase Velocity ◽  
Flow Rate ◽  
Hollow Fiber ◽  
Volume Fraction ◽  
Hollow Fiber Membrane ◽  
Absorption Efficiency ◽  
Membrane Contactor ◽  
Fiber Membrane ◽  
So2 Absorption

Sulfur dioxide (SO2) emissions lead to negative environmental impacts and it is considered as an indicator for the larger group of gaseous sulfur oxides (SOx) in the air. In this paper, the dimethylamine (DMA) solution was used as the absorbent in a α-Al2O3 hollow fiber membrane contactor that is operated under several conditions of gas velocity, liquid velocity, and 290 K operating temperature. The effects of gas and liquid phase properties and module configuration on SO2 absorption efficiency in the hollow fiber membrane contactor were investigated. Simulation results showed that the changes of gas phase velocity, liquid phase velocity, and concentration have great influences on the absorption efficiency of SO2. An increase of the gas flow rate decreases the SO2 absorption efficiency, while an increase of the liquid flow rate has the opposite effect, increasing the efficiency. Because gas in the membrane module stays for a longer time, more absorption time promotes the gas and liquid reaction. However, the changes of the volume fraction of SO2 in the mixed gas are not significant to SO2 absorption. The simulation model could provide guidelines for selecting suitable fluid properties during the SO2 absorption process in a hollow fiber membrane contactor.

Bifunctional Polysulfone-Chitosan Composite Hollow Fiber Membrane for Bioartificial Liver

2015 ◽  
Vol 1 (6) ◽  
pp. 372-381 ◽  
Author(s):  
Rohit S. Teotia ◽  
Dhrubajyoti Kalita ◽  
Atul K. Singh ◽  
Surendra K. Verma ◽  
Sachin S. Kadam ◽  
...  
Keyword(s):  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Bioartificial Liver ◽  
Fiber Membrane ◽  
Chitosan Composite

Effects of Feed Pressure and Retentate Flow Rate on the Performance of Locally Developed Polysulfone Membrane Oxygen Enrichment System

2012 ◽  
Author(s):  
Ahmad Fauzi Ismail ◽  
Chin Yin Tan ◽  
Fook Kiong Chan
Keyword(s):  
Flow Rate ◽  
Hollow Fiber ◽  
Capital Investment ◽  
Hollow Fiber Membrane ◽  
Membrane System ◽  
Oxygen Enrichment ◽  
Air Separation ◽  
Fiber Membrane ◽  
Polysulfone Membrane ◽  
Feed Pressure

Pengkayaan oksigen daripada udara persekitaran dengan menggunakan teknologi membran diterima secara meluas di seluruh dunia sebagai teknologi alternatif kepada kaedah konvensional seperti penjerapan ayunan tekanan dan sistem kriogenik. Pemisahan udara menggunakan membran adalah proses yang lebih anjal di mana ia memerlukan pelaburan modal yang rendah, kaedah operasi yang mudah dan murah jika dibandingkan dengan kaedah konvensional. Kajian dan pengujian telah dijalankan ke atas sistem membran gentian geronggang polisulfona, di mana kesan tekanan suapan dan kadar alir baki dikaji. Pada kadar alir malar, pengkayaan telapan meningkat dan kemudian menurun dengan peningkatan tekanan disebabkan oleh kesan perbezaan tekanan merentasi membran mempengaruhi kebolehtelapan lapisan kulit. Manakala pada tekanan suapan malar, nilai pengkayaan telapan maksimum dicapai pada kadar alir maksimum disebabkan oleh peningkatan rintangan penelapan. Nilai maksimum ketulenan telapan oksigen yang diperolehi dalam uji kaji ini ialah 27.2%. Kata kunci: Pemisahan udara; membran gentian geronggang; pengkayaan oksigen; kebolehtelapan; polisulfona Oxygen enrichment from surrounding air by using membrane is gaining wide acceptance through out the world today as an alternative to the conventional methods such as pressure swing adsorption and cryogenic system. Air separation using membrane is a more flexible process that requires lower capital investment and simple operation. Studies and testing had been performed on a locally new developed polysulfone hollow fiber membrane system, where effects of feed pressure and retentate flow rate on the oxygen enrichment were observed. At constant retentate flow rate, permeate enrichment increased and then decreased with pressure due to the effect of pressure difference across the membrane, which affects the permeability of the skin layer. While at constant pressure, the highest permeate enrichment value was obtained at highest retentate flow rate due to the increase of permeation resistance. The highest oxygen purity obtained in this experiment was 27.2% and the O2 permeate enrichment was 1.295. Key words: Air separation; hollow fiber membrane; oxygen enrichment; permeability; polysulfone

scholarly journals Effect of Feed Gas Flow Rate on CO2Absorption through Super Hydrophobic Hollow Fiber membrane Contactor

2018 ◽  
Vol 316 ◽  
pp. 012012
Author(s):  
Sutrasno Kartohardjono ◽  
Kevin Alexander ◽  
Annisa Larasati ◽  
Ivander Christian Sihombing
Keyword(s):  
Flow Rate ◽  
Hollow Fiber ◽  
Gas Flow ◽  
Hollow Fiber Membrane ◽  
Membrane Contactor ◽  
Gas Flow Rate ◽  
Fiber Membrane

Characteristics of Fresh Water Permeation in Hollow Fiber Membrane Module for Pressure Retarded Osmosis

2015 ◽  
Author(s):  
Shingo Terashima ◽  
Hidechito Hayashi ◽  
Tetsuya Okumura ◽  
Kei Matsuyama ◽  
Tetsuro Ueyama ◽  
...  
Keyword(s):  
Fresh Water ◽  
Water Flow ◽  
Flow Rate ◽  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Water Flow Rate ◽  
Forward Osmosis ◽  
Membrane Module ◽  
Fiber Membrane ◽  
Water Permeation

Forward Osmosis (FO) is recently paied attention to preprocessing of the Reverse Osmosis (RO). It can reduce the input power of RO plant. It is required to reduce the salt concentration at outlet and increase the permeation flow rate. In this paper, the characteristics of the fresh water flow and permeation are studied for the hollow fiber membrane module used in FO system. It is cleared that the disappearance of fresh water and the concentration polarization in hollow fiber largely influence to the reduction of permeation flow rate in the case of the low fresh water flow rate. Concentration of fresh water and the leakage of salt influence to the reduction of permeation flow rate in the case of high fresh water flow rate.

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