Gas-Liquid Displacement Porometer와 Liquid-Liquid Displacement Porometer를 이용한 세라믹 분리막 특성 분석

김여진,김성중,김정,조영훈,박호식,이평수,박유인,박호범,남승은 한국막학회 2017 멤브레인 Vol.27 No.3

분리막의 기공 크기 및 분포도를 분석하기 위한 다양한 측정법이 있지만 10-50 nm 범위의 한외여과막 기공크기 를 정확하게 측정하기가 까다롭다. 따라서 gas-liquid displacement porometer (GLDP)와 liquid-liquid displacement porometer (LLDP) 기공 특성 측정법 두 가지를 이용하여, 10-100 nm의 기공크기를 갖는 세 종류의 세라믹 분리막(K-100, A-100, A-20) 의 기공 크기 및 분포도를 비교 분석하였다. GLDP는 한외여과막의 최대 기공크기를 측정하는데 적합한 분석법으로 확인되 었고, LLDP로 측정된 평균 기공크기가 분리막의 분리 성능 결과와 더 연계되어 있었다. 또한 LLDP는 10-50 nm 범위의 기 공크기를 측정하는데 적합한 기공 분석법으로 확인되었으나, GLDP 보다 낮은 정밀도와 높은 민감도를 나타내었다. 다양한 기공 특성 분석법 가운데, 최근 상용화된 LLDP 기술은 종래의 측정법으로 알지 못했던 유용한 결과들을 제공할 수 있을 것 으로 기대된다. There are several different methods to characterize membrane pore size distribution, however, it is yet difficult to accurately measure pore size range of 10-50 nm. In this work, we employed gas-liquid displacement porometer (GLDP) and liquid-liquid displacement porometer (LLDP) to characterize in-house alumina hollow fiber membrane (K-100) and commercial membranes (A-100, A-20) that exhibit pore sizes between 10-100 nm. GLDP method was more suitable for measuring the maximum pore size, and the measured mean pore size of the membranes by LLDP were better correlated with water permeability and solute rejection. It was determined that LLDP is effective for measuring pore sizes between 10-50 nm; however, the method holds intrinsic disadvantages such as low precision and high sensitivity compared to that of GLDP. Nevertheless, it is expected that the recently commercialized LLDP technique can provide useful data that other methods cannot.

Gas-Liquid Displacement Porometer와 Liquid-Liquid Displacement Porometer를 이용한 세라믹 분리막 특성 분석

남승은,김여진,김성중,김정,조영훈,박호식,이평수,박유인,박호범 한국막학회 2017 멤브레인 Vol.27 No.3

분리막의 기공 크기 및 분포도를 분석하기 위한 다양한 측정법이 있지만 10-50 nm 범위의 한외여과막 기공크기를 정확하게 측정하기가 까다롭다. 따라서 gas-liquid displacement porometer (GLDP)와 liquid-liquid displacement porometer (LLDP) 기공 특성 측정법 두 가지를 이용하여, 10-100 nm의 기공크기를 갖는 세 종류의 세라믹 분리막(K-100, A-100, A-20) 의 기공 크기 및 분포도를 비교 분석하였다. GLDP는 한외여과막의 최대 기공크기를 측정하는데 적합한 분석법으로 확인되었고, LLDP로 측정된 평균 기공크기가 분리막의 분리 성능 결과와 더 연계되어 있었다. 또한 LLDP는 10-50 nm 범위의 기공크기를 측정하는데 적합한 기공 분석법으로 확인되었으나, GLDP 보다 낮은 정밀도와 높은 민감도를 나타내었다. 다양한기공 특성 분석법 가운데, 최근 상용화된 LLDP 기술은 종래의 측정법으로 알지 못했던 유용한 결과들을 제공할 수 있을 것으로 기대된다. There are several different methods to characterize membrane pore size distribution, however, it is yet difficult to accurately measure pore size range of 10-50 nm. In this work, we employed gas-liquid displacement porometer (GLDP) and liquid-liquid displacement porometer (LLDP) to characterize in-house alumina hollow fiber membrane (K-100) and commercial membranes (A-100, A-20) that exhibit pore sizes between 10-100 nm. GLDP method was more suitable for measuring the maximum pore size, and the measured mean pore size of the membranes by LLDP were better correlated with water permeability and solute rejection. It was determined that LLDP is effective for measuring pore sizes between 10-50 nm; however, the method holds intrinsic disadvantages such as low precision and high sensitivity compared to that of GLDP. Nevertheless, it is expected that the recently commercialized LLDP technique can provide useful data that other methods cannot.

Comparative study between liquid–liquid extraction and bulk liquid membrane for the removal and recovery of methylene blue from wastewater

M. Soniya,G. Muthuraman 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.30 No.-

In this research liquid–liquid extraction and bulk liquid membrane methods are used to study on theremoval and recovery of methylene blue dye from textile wastewater by using salicylic acid in benzene. First, the liquid–liquid extraction of methylene blue dye was investigated. The parameters examined inthis research were the effect of diluents, effect of pH, effect of extractant concentration, effect of dyeconcentration and the suitable stripping agent. Second, taking into consideration the obtained results,the transport of methylene blue dye across a bulk liquid membrane was studied. All the mentionedparameters applied in BLM technique and results are discussed.

Tailoring hydrophobicity of polyethersulfone membrane support for levulinic acid extraction using supported liquid membrane process

Vikneswary Rajendaren,Syed Mohd Saufi,Mior Ahmad Khushairi Mohd Zahari,Norasikin Othman,Raja Norimie Raja Sulaiman 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.12

This study investigated the effect of various hydrophobic fillers on polyethersulfone (PES) membrane support properties. Graphene, kaolin, ZIF-8, and fluoroalkylsilane were loaded from 0.1 wt% to 5 wt% in membrane casting solution. The structure and properties of the membrane changed accordingly based on the type of filler used. The finger-like pores in the PES membrane were extended, providing additional space for the liquid membrane impregnation. The contact angle value in the mixed matrix membranes was increased compared to the pristine PES membrane. The highest contact angle was shown by the additional of 0.5 ZIF-8 wt% in PES membrane with top and bottom contact angle value of 92.5o and 103.9o, respectively. PES membrane with 0.1wt% graphenes showed the highest porosity of 87.1%. PES membrane loaded with 0.1wt% ZIF-8 showed the most elevated tensile stress among the membrane support fabricated with a value of 1,036 kPa. The best extraction of levulinic acid (LA) from 10 g/L LA feed solution was achieved using 0.1 wt% graphene-PES membrane support with 89.2% extraction percentage.

Extraction/Separations of Cobalt by Supported Liquid Membrane: A Review

Basudev Swain,Hyun-Woo Shim,이찬기 한국화학공학회 2019 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.57 No.3

Extraction/separation of cobalt by supported liquid membrane has been reviewed. The review discusses various directions associated with the supported liquid membrane process, such as the kind of supported liquid membrane, the principle of supported liquid membrane, transport mechanism involved, and the advantages and disadvantages of the supported liquid. Finally, extraction and separation of cobalt from other metals using extractant through supported liquid membrane have been reviewed. Separation of cobalt using various reagents and cobalt recovery from scrap using commercial extractant can be a potential perspective from the application of supported liquid membrane application.

Separation of As(III) and As(V) by hollow fiber supported liquid membrane based on the mass transfer theory

Tatchanok Prapasawat,Prakorn Ramakul,Chairit Satayaprasert,Ura Pancharoen,Anchaleeporn W. Lothongkum 한국화학공학회 2008 Korean Journal of Chemical Engineering Vol.25 No.1

Separation of As(III) and As(V) ions from sulphate media by hollow fiber supported liquid membrane has been examined. Cyanex 923 was diluted in toluene and used as an extractant. Water was used as a stripping solution. The extractability of As(V) was higher than As(III). When the concentration of sulphuric acid in feed solution and Cyanex 923 in liquid membrane increased, more arsenic ions were extracted into liquid membrane and recovered into the stripping solution. The mathematical model was focused on the extraction side of the liquid membrane system. The mass transfer coefficients of the aqueous phase (ki) and organic phase (km) are 7.15×10−3 and 3.45×10−2 cm/s for As(III), and 1.07×10−2 and 1.79×10−2 cm/s for As(V). Therefore, the rate-controlling step for As(III) and As(V) in liquid membrane process is the mass transfer in the aqueous film between the feed solution and liquid membrane. The calculated mass transfer coefficients agree with the experimental results.

Dual component bi-layer electrospun nanofiber membrane for multiple phase liquid separation

( Arni Gesselle Manalo ),김헌 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1

Materials with selective interfacial activity dominates the industrial and environmental liquid separation application. Existing liquid separation techniques are influenced by chemical and physical modification to tune the membranes’ surface energy. Herein we demonstrate a new separating material influenced by the concept of using liquid to oppose immiscible contacting liquid, a liquid infused electrospun dual-component bilayer nanofiber membrane (DCNM) was scrutinized. A uniform over layer interface was established to repel other immiscible liquids. The DCNM was fabricated by electrospinning hydrophobic polymer polyvinylidene fluoride-co-hexafluoropropylene (PVDFhfp) on top of the electrospun hydrophilic polymer polyacrylonitrile (PAN). The thickness of each layer was varied and by varying the polymer deposition of the DCNM. The property of the infused liquid was used to regulate the membrane’s interface wettability which is a viable characteristic for multiphase liquid separation.

BMB 시스템의 중수도 적용성 평가에 관한 연구

강용태 ( Kang Yong Tae ),김태기 ( Kim Tae Gi ),조용현 ( Jo Yong Hyeon ),장성부 ( Jang Seong Bu ),장영일 ( Jang Yeong Il ) 한국수처리학회 2003 한국수처리학회지 Vol.11 No.3

N/A This study was performed to evaluate the BMB system which was composed by Rapid Biofilm Clarifier, Bioreactor and Membrane module. In Rapid Biofilm Clarifier replaced a conventional Primary Sedimentation, SS, BOD, COD were 40%. 20%, and 20% and turbidity, color were 30%and 10% respectively, which means that Rapid Biofilm Clarifier having HRT value of 5.2min can replace a conventional Primary Sedimentation of the HRT value of 2.0-2.5hr. The following summarizes the results obtained from Phase 1. The flux of the plate membrane and Hollow Fiber membrane was 120-140 L/㎡.hr.bar and 60-90 L/㎡.hr.bar. more quantity of water was passed at the Plate membrane than Hollow fiber membrane. And a Total resistance of Hollow fiber membrane was higher than plate membrane. The following is the results of performance on Phase 2. In Line Ⅰ with single-layer membrane frame, hydrauric retention time(HRT) was 11.6, 7.0, 4.6 hr. In Line II with multi-layer membrane frame, HRT was 5.8, 3.5, 2.3 hr. According to the test on Phase 2, SS was revealed 0㎎/L. COD 4.2㎎/L. BOD 4.7㎎/L, Turbidity 0.37NTU. Color 14.7unit and T. Coli. not detective in Line Ⅰ. In Line Ⅱ, SS 0㎎/L, COD 6.2㎎/L, BOD 5.4㎎/L, Turbidity 0.52 NTU, Color 15.1 unit and T. Coli. not detective. This means that Line Ⅰ , Ⅱ of BMB system can meet water quality standard of Water reuse system. Estimation of Application of BMB system was represented as follows. This system can meet standard of BOD(l0㎎/L) up to F/M ratio 0.236gBOD/gMLSS . day. BMB system with multi-layer membrane frame made flux increased by 2 times and air flow rates reduced by 28.5% lower than single-layer membrane frame. In view of the results so far achieved, BMB system is more economical than any other systems.

A simple preparation method for rare-earth phosphate nano materials using an ionic liquid-driven supported liquid membrane system

Panpan Zhao,Fan Yang,Zhigang Zhao,Qiuxiao Liao,Yang Zhang,Peng Chen,Wanghuan Guo,Ruixi Bai 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.54 No.-

For the first time, our group has developed a novel, high-flux strategy for shape-controlled synthesis of rare earth nano-materials (CePO4) using ionic liquid(IL)-driven supported liquid membrane (HVHP, DUPAPORE1) system. The system contains three phases including a supply phase of rare earth ions, a feed phase of phosphates, and ionic liquid-driven supporting liquid membrane phase. The imidazolium IL-driven supported liquid membrane is promising for nano-synthetic reaction of CePO4. The anion types of immersed imidazolium IL have a critical role in the formation rate of CePO4 nano-materials. Moreover, the adding SO4 2 anion or adjustment of pH in supply phase containing Ce(III) ions could control effectively the morphology of the CePO4 nano-materials. The result can be regarded as a good example, the IL:[C4mim][Tf2N] driven support liquid membrane systems can be used to prepare nano-wire and nano-sphere structures of CePO4 with high efficiency and flux. Besides, the IL-driven supported liquid membrane can be cycled many times by using the back flush activation method.

Advanced Membrane Systems for Seawater Desalination. Kinetics of Salts Crystallization from RO Brines Promoted by Polymeric Membranes

Curcio, Efrem,Obaidani, Sulaiman Al,Macedonio, Francesca,Profio, Gianluca Di,Gualtieri, Silvia,Drioli, Enrico 한국막학회 2007 멤브레인 Vol.17 No.2

The reliability of innovative membrane contactors technology (i.e. Gas/Liquid Membrane Contactors, Membrane Distillation/Crystallization) is today increasing for seawater desalination processes, where traditional pressure-driven membrane separation units are routinely operated. Furthermore, conventional membrane operations can be integrated with membrane contactors in order to promote possible improvements in process efficiency, operational stability, environmental impact, water quality and cost. Seawater is the most abundant aqueous solution on the earth: the amount of dissolved salts covers about 3% of its composition, and six elements (Na, Mg, Ca, K, Cl, S) account for more than 90% of ionic species. Recent investigations on Membrane Distillation-Crystallization have shown the possibility to achieve significant overall water recovery factors, to limit the brine disposal problem, and to recover valuable salts (i.e. calcium sulphate, sodium chloride, magnesium sulphate) by combining this technology with conventional RO trains. In this work, the kinetics of CaSO4 · 2H2O, NaCl and MgSO4 ·7H2O crystallization is experimentally investigated in order to improve the design of the membrane-based crystallization unit.