• Title/Summary/Keyword: aqueous phase separation

Search Result 155, Processing Time 0.028 seconds

Separation of Cr(VI) from Heavy Metal Salts Mixed Solution by using Hollow Fiber Module (실관막모듈에 의한 중금속염 혼합용액으로부터 Cr(VI) 분리)

  • 최대웅
    • Journal of Environmental Health Sciences
    • /
    • v.27 no.3
    • /
    • pp.107-112
    • /
    • 2001
  • This work reports the application of a hollow fiber module(HFM) for Cr(VI) extraction from heavy metal salts mixed solution by using microporous hydrophobic hollow fiber module. In HFM configuration, the organic extraction used for the extraction of Cr(VI) was di-(2-ethyl hexyl) phosphoric acid(D2EHPA) diluted with n-heptane. The study of HFM includes the influence of hydrodynamic and chemical condition, i.e., the flow rate of feed solution, the time of reactive extraction, the concentration of feed solution, and the pH of aqueous phase solutions. Several experiments with synthetic solution of different mixed components system of Cr(VI) solutions established optimum condition to achieve a clean separation of Cr(VI). It was possible to separate Cr(VI) in the presence of metal salts mixed solution, such as Zn(II), Ni(II), Cu(II), and Cd(II) using the HFM technique.

  • PDF

Separation of Organic Pollutants by Nondispersive Membrane-Solvent Extraction (비분산 막-용매추출에 의한 유기오염물의 분리)

  • 유홍진;한성록
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.5 no.2
    • /
    • pp.174-185
    • /
    • 2004
  • Organic pollutants (Phenol, 2-Chlorophenol, Nitrobenzene) were separated from wastewater by nondispersive membrane solvent extraction, using a microporous hydrophobic hollow fiber module. The system was operated countercurrently and cocurrently with the aqueous phase flowing through the fiber lumens and the solvent flowing through the shell side. The distribution coefficients of several solvents (MIBK, IPAc, Hexane) were examined and MIBK was selected as an extracting solvent. Separation efficiency of countercurrent flow method was better than that of cocurrent flow method. Also, the overall mass transfer coefficients were determined.

  • PDF

Chiral separation of amino acids in urine specimens from patients with inherited metabolic disorders by achiral gas chromatography

  • Paik, Man-Jeoneg;Choi, Young-Mie;Nguyen, Duc-Toan;Kim, Ji-Yung;Kim, Jung-Han;Kim, Kyoung-Rae
    • Proceedings of the PSK Conference
    • /
    • 2003.10b
    • /
    • pp.218.2-218.2
    • /
    • 2003
  • An efficient method is described for the enantioseparation of urinary amino acids to determine their absolute configurations. It involves two-phase extractive ethoxycarbonylation in alkaline aqueous solution with subsequent extraction after acidification. The resulting derivatives of amino acids are converted to volatile diastereomeric esters or amides for the direct analysis by gas chromatography (GC) on achiral dual-columns with different polarities. The present method was applied to urine specimens from patients with inherited metabolic disorders. In this study, the usefulness for the chiral separation of diagnostic amino acids will be discussed.

  • PDF

Alternative chromatographic method for the assay test of terbutaline and salbutamol using ionic liquid assisted aqueous mobile phase

  • Mai, Xuan-Lan;Choi, Yusung;Truong, Quoc-Ky;Nguyen, Thi-Ngoc-Van;Han, Sang Beom;Kim, Kyeong Ho
    • Analytical Science and Technology
    • /
    • v.33 no.4
    • /
    • pp.169-176
    • /
    • 2020
  • Separation of basic compounds using reverse phase chromatography on a silica-based stationary phase represents a major challenge, because of the interaction between the cationic sites of the basic compounds with the anionic silanols of the stationary phase. This study presents a simple, reliable, and organic solvent - free liquid chromatographic method for the determination of terbutaline and salbutamol, in which a room temperature ionic liquid (RTIL) is used as mobile phase additive. We investigated various mobile phase parameters affecting the retention of the two compounds, such as types and concentration of RTILs and, pH of the mobile phase were investigated. The developed method was validated according to International Conference on Harmonization (ICH) guidelines and successfully applied effectively to determine salbutamol sulfate in pharmaceutical preparations.

Development of centrifugal extractor for organic phase extraction using a height controlled separation weir and a divert plate (분리 웨어의 상하 조절과 전형판을 이용한 유기상 원심추출기 개발)

  • 김영환;윤지섭;정재후;홍동희;박기용
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • 1997.10a
    • /
    • pp.515-518
    • /
    • 1997
  • Resident time of the centrifugal extractor for organic phase extraction using a height controlled separator weir and a divert plate is the important factor that affects significantly the chemical material extraction and the productivity in the chemical and mechanical processes. In this paper, it describes the design of the device for extraction of an organic phase from radioactive wastes, and considers phase separating weir and divert disk, both being designed to be adjustable in their positions, for effectively separating an organic phase. A height-adjustable separating weir unit used for separating the organic phase from the aqueous phase using a phase separating weir and designed to control the height of the separating weir as desired so as to allow the weir to be positioned at a boundary layer between two separated phases. The centrifugal extractor controls satisfactorily the mixed reaction time of two phases within the separator regardless of the variations of the mixing ratio of the two phases and the rotating speed of the extractor, is designed to be adjustable in its position in the vertical direction, thus allowing the user to appropriately select the mixed reaction time of the two phases within the extractor as desired. From development of a centrifugal extractor, it can effectively recover such usable elements, and preferably reducing the output quantity of radioactive wastes.

  • PDF

Synthesis of Wood Adhesive Derived from the Milk Protein and the Blocked Isocyanate

  • Ha, Yuna;Lee, Sang-Min;Lee, Hyang-Yeol
    • Journal of the Korean Applied Science and Technology
    • /
    • v.30 no.3
    • /
    • pp.551-559
    • /
    • 2013
  • To investigate the adhesion effect of sodium bisulfite content in making blocked isocyanate, wood adhesive PB-1, PB-2, PB-3 and PB-4 containing sodium bisulfite content of 15%, 22.5%, 30% and 37.5% were synthesized respectively. As a result, when the amount of sodium bisulfite increased in adhesives, the tensile strength was found to be proportionally increased. The final adhesive mixtures were manufactured using a two-components system which are prepared by mixing two separate protein and BI solutions due to the precipitate in the adhesives. As PVA was added to adhesives to increase tenacity, the plywood dehiscence phenomenon after cold pressing process was declined. By addition of PVA, the tensile strength was improved up to $6.5{\sim}7kgf/cm^2$ with BI/protein ratio from 1:6 up to 1:8. Phase separation between milk fat and aqueous layer was disappeared after addition of emulsifier, Tween 20. Additon of Tween 20 showed tensile strength up to $5{\sim}6.5 kgf/cm^2$ at NCO/protein ratio of 1:12 ~ 1:14 without phase separation.

Separation of Aqueous Ethanol Solution Using a PAA-PAN Composite Membrane Through Pervaporation (PAA-PAN 복합막을 이용한 에탄올 수용액의 투과증발 분리)

  • 원장묵;하백현;최호상
    • Membrane Journal
    • /
    • v.6 no.3
    • /
    • pp.182-187
    • /
    • 1996
  • Hydrophilic poly(acrylonitrile) [PAN] membrane with good molecular weight cut-off characteristics were prepared by using the phase inversion method. Permeability and molecular weight cut-off of the membranes were measured through the ultrafiltration test. On the surface of the PAN support membranes, poly(acrylic acid) [PAA] was deposited by dip-coating. The water permeability of the PAN support membrane had $0.17~31\textrm{mm}^3/m^{2} \cdot s \cdot Pa$, the molecular weight cut-off 42, 000~150, 000. The transport characteristics of the prepared composite membranes were significantly affected by the variation of the support membrane mophology. The permeability of the composite membrane was decreased with increasing molecular weight cut-off of the support membrane, and the separation factor was slightly changed depending on the feed concentration.

  • PDF

Study on Separation of Heavy Metal Ions in A Neutral Macrocycle-Mediated Emulsion Liquid Membrane System

  • Moon-Hwan Cho;Hea-Suk Chun;Jin-Ho Kim;Chang-Hwan Rhee;Si-Joong Kim
    • Bulletin of the Korean Chemical Society
    • /
    • v.12 no.5
    • /
    • pp.474-477
    • /
    • 1991
  • The preferential transport phenomena of neutral cation-anion moieties in neutral macrocycle-facilitated emulsion liquid membrane were described in this study. Emulsion membrane systems consisting of (1) aqueous source phase containing 0.001 M M($NO_3$)$_2(M=Mn^{2+},\;Co^{2+},\;Ni^{2+},\;Cu^{2+},\;Zn^{2+},\;Sr^{2+},\;Cd^{2+},\;and\;Pb^{2+})$ (2) a toluene membrane containing 0.01 M ligand $(DBN_3O_2$, DA18C6, DT18C6, TT18C6, HT18C6) and the surfactant span 80 (sorbitan monooleate) (3% v/v) and (3) an aqueous receiving phase containing $Na_2S_2O_3$ or $NaNO_3$ were studied with respect to the disappearence of transition metal ions from the source phase as a function of time. Cation transports for various two component or three component equimolar mixture of transition metal and $Cu^{2+}$ in a emulsion membrane system incorporating macrocyclic ligand (HT18C6) as carrier were determinded. $Cu^{2+}$ was transported higher rates than the other $M^{2+}$ in the mixture solution. Equilibrium constants for cation-source phase co-anion, cation macrocycle and cation-receiving phase reagent interaction are examined as parameters for the prediction of cation transport selectivities.

Separation of Cu(II) from Metal Mixture Solution Using a Hexadecyl $NtnOenH_4$-Octadecylsilanized Silicas(ODS) in Liquid Chromatography (액체 크로마토그래피에서 Hexadecyl $NtnOenH_4$-Octadecylsilanized silicas(ODS)를 이용한 혼합금속용액으로부터 Cu(II)의 분리)

  • Shin, Young-Kook;Kim, Si-Joong;Kim, Hae-Joong
    • Analytical Science and Technology
    • /
    • v.8 no.3
    • /
    • pp.299-304
    • /
    • 1995
  • The adsorption behaviors of Ba(II), Cr(II), Fe(II) and Cu(II) on the N, N'-bispalmtoyl 1, 12-diaza-3, 4:9, 10-dibenzo-5, 8-cyclopentadecane (hexadecyl $NtnOenH_4$)-octadecylsilanized silicas(ODS) were investigated with water as the mobile phase. Binding constants for metal ions were measured in aqueous solution. The order of binding constants(K) and the degree of sorption(E) were Ba(II)$NtnOenH_4$-octadecyisiianized silicas(ODS) increased with concentration of metal ions, and the degree of adsorption was found to be affected by the cation-chelation mechanism. The experimental results showed good efficiency for separation of Cu(II) from mixtures of Ba(II), Cr(II), Fe(II) and Cu(II) in aqueous solution.

  • PDF

Protein Separation with CTAB/Hexanol/Isooctane Reverse Micellar System (CTAB/Hexanol/Isooctane 역미셀계를 이용한 단백질 분리)

  • 김영숙;신해헌;권윤중;변유량;홍석인
    • Microbiology and Biotechnology Letters
    • /
    • v.18 no.5
    • /
    • pp.517-524
    • /
    • 1990
  • The solubilization and desolubilization of proteins in CTAB/hexanol/isooctane reverse micellar system were investigated for the selective separation of proteins. Several proteins were used, including bovine serum albumin (BSA), pepsin, trysin and ribonuclease-a. Most proteins could be solubilized into reverse micelles in the pH range above the isoelectric point of each protein, where the net charge of protein was opposite to that of surfactant. However BSA was solubilized above pH 10, which is serveral pH units above the pI 4.9. The kinds of anions in aqueous phase influenced on protein solubilization while no significant trend was observed with different cations, Protein solubilization decreased with increase of the ion size in the order of F -, C1-, Br- and I -. The size of CTAB micelles did not change significantly with increasing ionic strength, but the solubilization decreased. Protein desolubilization showedropposite behaviors to the solubilization. Several model mixtures such as pepsin/ trypsin, pepsin/ribonuclease-a and BSAlribonucleaee-a were successfully separated from each other without changing enzymatic activities.

  • PDF