• Title/Summary/Keyword: Hollow Fiber Membrane Contactor

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Dissolution of Oxygen in Water by Nonporous Hollow Fiber Membrane Contactor (비다공성 분리막을 이용한 수용액 내 용존 산소 조절)

  • Lee, Yong-Taek;Jeong, Heon-Kyu;Ahn, Hyo-Seong;Song, In-Ho;Jeon, Hyun-Soo;Jeong, Dong-Jae
    • Membrane Journal
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    • v.17 no.4
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    • pp.352-358
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    • 2007
  • A nonporous hollow fiber membrane contactor was used to control the concentration of oxygen dissolved in an aqueous solution, which was predicted along the hollow fiber membrane using a computer simulation. The governing ordinary differential equations were derived for the occurrent flows of the feed aqueous solution and the feed gas mixture in a membrane contactor and they were numerically solved using the 5th Runge-Kutta-Verner method with a personal computer, where the program was coded utilizing a software of the Compaq Visual Fortran 6.6. It is found that the concentration of oxygen dissolved in water increases from 30 to 64 ppm as the length of the hollow fiber increases from 0.4 to 1.2 m when the membrane of fibers are equal to be 16,000; the flow rate of the feed gas is kept to be 0.536 mol/sec; its pressure is maintained to be 486 kPa; the flow rate of the water is 16.69 mol/sec. As the flow rate of the water increases from 9.26 to 26.85 mol/sec, the concentration of oxygen decreases from 40 to 20 ppm with the constant fiber length of 0.4 m. Finally, it is observed that the concentration of oxygen increases from 33 to 69 ppm as the pressure of the feed gas increases from 298 to 847 kPa.

CONTROL OF CARBON DIOXIDE REMOVAL RATE BY HOLLOW FIBER MEMBRANE CONTACTOR

  • Lee,Yong-Taek;Cho, Ingi;Lim, Hye-Jin;Ahn, Hyo-Seong;Hahm, Moon-Ky;Park, You-In;Lee, Kew-Ho
    • Proceedings of the Membrane Society of Korea Conference
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    • 1999.07a
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    • pp.48-51
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    • 1999
  • To investigate numerically the removal behavior of carbon dioxide in a hollow fiber membrane contactor, the system controlling equations were developed including the nonlinear reversible reaction terms. The reversible chemical reactions were incorporated in the system controlling equations, resulting in the coupled nonlinear partial differential equations which could describe either the absorption of the desorption of carbon dioxide. The computer program was coded using the Fortran language and run with a personal computer to find out the effects of the system variables: the pressures of absorbed and desorbed gases, the absorbent flow rate, the concentration of potassium carbonate, the fiber diameter and the length.

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Extraction of La(III) by a nonionic microemulsion containing D2EHPA in hollow fiber contactor

  • Ou, Huilin;Gong, Fuzhong;Tang, Yanxia;Luo, Yan;Liu, Liheng
    • Membrane and Water Treatment
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    • v.12 no.2
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    • pp.75-82
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    • 2021
  • This study aimed to prepare a W/O nonionic microemulsion system(MEs) consisting of OP-4[polyoxyethylene(4) nonylphenol], OP-7[polyoxyethylene(7) nonylphenol], 1-hexanol, D2EHPA, kerosene and HCl solution and applied to the extraction of La(III) from chloride aqueous solution within the polysulfone hollow fiber contactor (HFC),laboratory-scale experiments were carried out to investigate the recovery of La(III) using as-prepared microemulsion from the simulation wastewater containing La(III),Al(III) and Fe(III). The right weight ratio(Rs) of OP-4 to OP-7 was firstly confirmed through determination of the solubilization capacity of HCl solution(W0,HCl) in microemulsion, the effect of several factors such as the HCl concentration, temperature and effective extraction time on the extraction efficiency of La(III) was discussed. Results showed that the acceptable Rs was 4:6 to prepare the W/O MEs. The extraction yield of La(III) increased with the increasing of HCl concentration, temperature and effective extraction time and reaches to 97.3% while using five-stage modules. The recovery yield of La(III) from simulation La-bearing wastewater was 90.6%.

Development of High-Durability Ceramic Hollow Fiber and Performance Evaluation of Contact Membrane Process according to Pressure Conditions (고내구성 세라믹 중공사 개발과 압력 조건에 따른 접촉막 공정의 특성 평가)

  • Lee, Seung Hwan;Jeong, Byeong Jun;Shin, Min Chang;Zhuang, Xuelong;Jung, Jiwon;Lee, Yeon Jun;Won, Dongyeon;Park, Jung Hoon
    • Membrane Journal
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    • v.30 no.6
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    • pp.443-449
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    • 2020
  • In this study, CO2 separation experiment was performed on a CH4/CO2 mixed gas using a ceramic hollow fiber membrane contactor module (HFMC). In order to fabricate high-durability HFMC, a high-durability hollow fiber membrane was prepared and evaluated. HFMC was fabricated using the prepared hollow fiber membrane, and the experiment used a mixture of CH4/CO2 (30% CO2, CH4 balance) and monoethanolamine (MEA). During HFMC operation, the effect of gas and absorbent pressure on the CO2 removal efficiency was evaluated. The CO2 removal efficiency increased as the gas pressure increased, and the CO2 absorption flux also showed a tendency to increase with the liquid flow rate. In addition, when the CO2 absorption rate was less than 40%, LTS-1, a counter-current form where the absorbent enters from the bottom, has higher CO2 removal performance than LTS-2, a countercurrent form in which the absorbent enters from the top. and when the absorption rate was 40% or higher, LTS-2 had higher performance than LTS-1.

Development of a Supported Emulsion Liquid Membrane System for Propionic Acid Separation in a Microgravity Environment

  • Li, Jin;Hu, Shih-Yao B.;Wiencek, John M.
    • Biotechnology and Bioprocess Engineering:BBE
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    • v.6 no.6
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    • pp.426-432
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    • 2001
  • Perstractive fermentation is a good way to increase the productivity of bioreactors. Us-ing Propionibacteria as the model system, the feasibility of using supported emulsion liquid mem-brane(SELM) fro perstractive fermentation is assessed in this study. Five industrial solvents were considered as the solvent for perparing the SELM. The more polar a solvent, is the higher the par-tition coefficeint However, toxicity of a solvent also increases with its polarity. CO-1055(indus-trial decanol/octanol blend)has the highest partition coefficient toward propionic acid among the solvents that has no molecular toxicity toward Propionibacteria, A preliminary extraction study was conducted using tetradecane as solvent in a hydrophobic hollow fiber contactor. The results confirmed that SELM eliminates the equilibrium limitation of conventional liquid-liquid extrac-tion and allows the use of a non-toxic solvent with low partition coefficient.

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A Study on the Absorption of Carbon Dioxide using PVDF/Plasma Membrane Contactor (PVDF/플라즈마 막접촉기를 이용한 이산화탄소의 흡수에 관한 연구)

  • Choi, Seung-Hak;Gao, Tongzhai;Oh, Sae-Joong
    • Korean Chemical Engineering Research
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    • v.43 no.1
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    • pp.161-169
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    • 2005
  • Numerical simulation and experiments were carried out on the absorption of carbon dioxide using PVDF hollow-fiber membrane contactor. Water or monoethanolamine (MEA) aqueous soluton was used as absorbents. Simulation results showed that the concentration profile of carbon dioxide was less affected by the flow rate of MEA than that of water absorbent. The absorption rate and mass transfer coefficient of carbon dioxide increased as the concentration of MEA increased. The mass transfer coefficients obtained by experiments coincided with those obtained by numerical simulation and theoretical results for $CO_2-water$ system. However, for $CO_2-MEA$ system, the mass transfer coefficients obtained by experiments were lower than those obtained by simulation, while the simulation results agreed well with theoretical results. The durability of plasma-treated hollow fiber membranes was better than that of no plasma-treated ones.

Mathematical modeling of humidification process by means of hollow fiber membrane contactor

  • Marjani, Azam;Baghdadi, Ali;Ghadiri, Mehdi
    • Membrane and Water Treatment
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    • v.7 no.4
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    • pp.297-311
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    • 2016
  • Modeling and simulation of air humidification by hollow fiber membrane contactors are investigated in the current study. A computational fluid dynamic model was developed by solving the k-epsilon turbulence 2D Navier-Stokes equations as well as mass conservation equations for steady-state conditions in membrane contactors. Finite element method is used for the study of the air humidification under different operating conditions, with a focus on the humidity density, total mass transfer flux and velocity field. There has been good agreement between simulation results and experimental data obtained from literature. It is found that the enhancement of air stream decreases the outlet humidity from 0.392 to 0.340 (module 1) and from 0.467 to 0.337 (module 2). The results also indicated that there has been an increase in air velocity in the narrow space of shell side compared with air velocity wide space of shell side. Also, irregular arrangement has lower dead zones than regular arrangement which leads to higher water flux.

Evaluation of Propylenecarbonate/water Physical Absorbents and its Application in Membrane Contactors for CO2/CH4 Separation (CO2/CH4 분리를 위한 프로필렌카보네이트/물 흡수제 특성 평가 및 막접촉기의 적용)

  • Park, Ahrumi;Kim, Seong-Joong;Lee, Pyung Soo;Nam, Seung Eun;Park, You In
    • Membrane Journal
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    • v.26 no.2
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    • pp.126-134
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    • 2016
  • To produce renewable biomethane from biogas, the properties of physical absorbents such as water, methanol, 1-methyl-2-pyrrolidone (NMP), poly(ethylene glycol) dimethylether (PEGDME), and propylene carbonate (PC) were studied, and PC was applied to membrane contactor systems. Among physical absorbents, PC exhibited a high contact angle of $58.3^{\circ}$ on polypropylene surface, and a PC/water mixture (5 wt%) increased the contact angle to $90^{\circ}$. Furthermore, the PC/water mixture presented higher $CO_2$ absorption capacities (0.148-0.157 mmol/g) than that of water (0.121 mmol/g), demonstrating a good property as an absorbent for membrane contactors. Actual operations in membrane contactors using the PC/water mixture resulted in $CO_2$ removal of 98.0-97.8% with biomethane purities of 98.5-98.3%, presenting a strong potential for biogas treatment. However, the PC/water mixture yielded moderate improved in $CO_2$ removal and methane recovery, as compared with water in the membrane contactor operation. This is originated from insufficient desorption processes to reuse absorbent and low $CO_2$ flux of the PC/water absorbent. Thus, it is requiring optimizations of membrane contactor technology including development of absorbent and improvement of operation process.