• 제목/요약/키워드: Liquid membrane

검색결과 631건 처리시간 0.026초

액상 비료를 유도 용액으로 사용하는 정삼투 기반의 해수 담수화 (Forward Osmosis Based Seawater Desalination using Liquid Fertilizer as Draw Solution)

  • 박성직;안희경
    • 한국농공학회논문집
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    • 제55권2호
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    • pp.21-27
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    • 2013
  • The present study explored the way to desalinate seawater for agricultural irrigation using forward osmosis (FO) process using liquid fertilizer as draw solution. FO experiments were performed in a cross flow mode using flat sheet FO membrane. The effect of membrane orientation, flow rate, and draw solution concentration on the performance of forward osmosis was investigated by measuring water flux of forward osmosis membrane. The water flux when the draw solution was placed against the membrane active layer was lower than the water flux when the feed solution was placed against the membrane active layer. This results indicated that the decrease of effective osmotic pressure by dilutive internal concentration polarization was less than that by concentrative internal concentration polarization. Increasing flow rate from 66.7 to 133.1 $cm^3$/min resulted in increase of the water flux when the membrane active layer orient to draw solution and feed solution, respectively. The reduction of resistance to water flow increased water flux at higher flow rate. The water flux of FO membrane increased with increasing draw solution concentration from 10000 to 30000 mg/L. The water flux for $KH_2PO_4$ draw solution was similar to that for commercial fertilizer. Optimization of FO process would contribute to economically desalinate brackish water for agricultural use.

액화천연가스 저장탱크용 멤브레인의 유한요소해석 (Finite Element Analysis of Membrane for LNG Storage Tank)

  • 김영규;윤인수;홍성호;전인기
    • 대한기계학회논문집
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    • 제18권10호
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    • pp.2797-2804
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    • 1994
  • This paper analyzes the behaviors of corrugated membrane under the cryogenic liquid pressure and thermal loading using the FEM analysis program MARC. The FEM calculations were carried out on the basis of measured data of Technigaz membrane. It is very important to know the concentration levels and distributions of stress in the corrugated membrane. A quarter of the membrane sheet in place of the whole membrane was simulated because of its geometric symmetricity. The calculated results of the concentrated stress showed that the maximum stress occurs at the knot parts and at the root corner radius of the corrugations. The FEM calculated results indicated that the ring knot membrane which was developed in this study showed uniformly distributed stress and the lowest stress levels in the cross knot area in comparison with other two membranes. These results are very important to optimize the shape and improve the safety of membrane structure.

고분자전해질연료전지용 과불소계 술폰화 이오노머-PTFE 강화막 (Perfluorinated Sulfonic Acid Ionomer-PTFE Pore-filling Membranes for Polymer Electrolyte Membrane Fuel Cells)

  • 강성은;이창현
    • 멤브레인
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    • 제25권2호
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    • pp.171-179
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    • 2015
  • 과불소계 술폰화 이오노머(perfluorinated sulfonic acid ionomers; PFSAs)는 뛰어난 수소이온전도성과 높은 내화학성으로 인해 고분자 전해질 연료전지(polymer electrolyte fuel cells)용 고체전해질로 널리 사용되고 있다. 그러나 PFSA 전해질은 가습-건조조건에서 연료전지가 구동에 따라 반복적인 팽윤-수축으로 인해 전극층이 전해질로부터 탈리되어 전기화학적 수명특성이 감소되는 문제점을 가지고 있다. 본 연구에서는 다공성 PTFE support film의 기공특성에 대한 이해를 바탕으로 기공구조 내 나피온 이오노머를 함침시키는 강화막을 제조하였고, 기본특성을 평가하였다. 제조된 강화막은 매우 높은 수소이온전도도(${\sim}~0.5S\;cm^{-1}@90^{\circ}C$ in liquid water)를 나타내었다.

Distortion of Eelectrical Double Layer in Liquid Filtration by Fibrous Filters

  • Lee, Myong-Hwa;Hirose, Shogo;Otani, Yoshio
    • 한국입자에어로졸학회지
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    • 제10권3호
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    • pp.99-108
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    • 2014
  • Liquid filtration by membrane filters is essential for the preparation of ultrapure water in semiconductor manufacturing processes. The separation of submicrometer particles suspended in ultrapure water with a laminated fibrous membrane filter was studied numerically and experimentally in the present work. We found that an electrical double layer around a single fiber expanded to a large extent at a low ion concentration, as in ultrapure water, and deformed toward the upstream of the fiber with increasing filtration velocity. Since an increase in the electrical double-layer thickness leads to a decrease in the electrical potential gradient, particles with the same polarity as the fiber approach the fiber more easily and are captured at a high filtration velocity. Experimental results also confirmed that the collection efficiency of polystyrene latex(PSL) particles through a PTFE filter became higher as the filtration velocity increased.

LNG 저장탱크용 멤브레인 형상설계를 위한 유한요소해석 (Finite Element Analysis of the Corrugated Membrane of LNG Storage Tank for Its Geometric Design)

  • 김성원;이성우;이중남
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 1997년도 춘계학술대회 논문집
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    • pp.620-624
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    • 1997
  • Corrugated membranes which are used as a means of liquid- and gas-sealing for a LNG storage tank and provide one of the most reliable primary barrier are the main component of in-ground membrane types for the assurance of high safety. It absorbs large thermal and mechanical deformations caused by ultra low temperature of LNG, -162 .deg.c, the cryogenic liquid and mechanical deformations caused by was carried out on crossing corrugation by commercial F.E code, ANSYS. This paper presents some of results in stress analysis of membranes performed for the purpose to investigate the strength of existing membrane for LNG storage tank designed by IHI,MHI, KHI and KGC expect for Technigaz eariy published. Based on these analytical studies,design criteria were estabilished and SHI original membranes having a high level of safety and fitting to larger capacities were developed.

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REPONSE OF POLYMERIC MEMBRANES AS SENSING ELEMENTS FOR ELECTRONIC TOUGUE

  • Bae, Y.M.;Cho, S.I.
    • 한국농업기계학회:학술대회논문집
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    • 한국농업기계학회 2000년도 THE THIRD INTERNATIONAL CONFERENCE ON AGRICULTURAL MACHINERY ENGINEERING. V.II
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    • pp.219-226
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    • 2000
  • The study was executed for development of sensing elements of electronic tongue which could discriminate taste of liquid and semi-liquid foods. Five polymeric membranes which were composed of polymer, plasticizer, electro-active materials were prepared. After each polymeric membranes were mounted in an electrode body, membrane potentials due to electrochemical reaction with taste stimuli were measured. The experimental results were interpreted in view of the membrane's non-selective responses to stimuli.

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Facilitated Transport of Cr(VI) through a Supported Liquid Membrane with a Carrier

  • Park, Sang-Wook;Lee, Jae-Wook;Kim, Sung-Soo;Choi, Byoung-Sik
    • 한국응용과학기술학회지
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    • 제20권2호
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    • pp.154-164
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    • 2003
  • This paper has applied a simple model to the mass transfer mechanism of Cr(VI) with crownether in a batch-type, supported liquid membrane module. Concentration at pH 3 are as follows : 0.012 kmol/$m^3{\le}$18-crown-6${\le}$0.036 kmol/$m^3$ and 20 g/$m^3{\le}$ Cr(VI)${\le}$500 g/$m^3$. The measured values of forward- and backward-reaction rate constants between Cr(VI) and 18-crown-6 were used to simulate the model with the mass conservation equation and associated boundary conditions. Comparison between the experimental and simulated facilitated factor of Cr(VI) transport led to classification of reaction regions.

Efficient extraction and recovery of Lignosulfonate using sunflower oil as green solvent in liquid membrane transport: Equilibrium and kinetic study

  • Kumar, Vikas;Singh, Raghubansh K.;Chowdhury, Pradip
    • Journal of Industrial and Engineering Chemistry
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    • 제67권
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    • pp.109-122
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    • 2018
  • This work highlights extraction and removal of Lignosulfonate using sunflower oil-Tri-n-octylamine (TOA) system in bulk liquid membrane transport. Maximum extraction and recovery percentages of 92.4% and 75.2% were achieved. Optimum manifold operating conditions were: 4 vol.% TOA, $2{\pm}0.1$ feed phase pH, 300 rpm stirring speed, at $40^{\circ}C$ with 0.2 (M) $Na_2SO_4$ solution. 1:2 (organic/aqueous) and 1:1 (aqueous/aqueous) phase ratios produced best results. Extraction (36.85 kJ/mol) was found to be intermediate controlled and stripping (54.79 kJ/mol) was chemical reaction controlled. Kinetic estimation of data with higher rate constants for stripping vis-${\grave{a}}$-vis extraction showed latter to be rate determining.

초소형 주사 시스템의 모의 혈관 내에서의 작동 시험 (In Vitro Test of a Micro Syringe Fabricated for the Intravascular Injection)

  • 김근영;심우영;이상우;양상식;장준근;이승기
    • 대한전기학회논문지:전기물성ㆍ응용부문C
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    • 제50권6호
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    • pp.307-313
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    • 2001
  • A micro syringe which can be attached to the end of a micro intravascular endoscope for drug injection is fabricated and its characteristic is tested. The syringe consists of a drug chamber and an actuator chamber which are separated by a silicone rubber membrane. The drug chamber is filled with liquid drug by the membrance actuation caused by the vaporization and condensation of the working liquid in the actuator chamber. The liquid drug is ejected by the electrolysis of the working liquid. The membrane deflection by each actuation method has been measured. The liquid ejection image has been captured during the electrolysis of the electrolyte. Also, the successful operation of the micro syringe under the normal blood pressure was verified.

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