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염산용액에서 Di-n-hexyl sulfide에 의한 팔라듐의 溶媒抽出
李在天,鄭鎭己,朴珍泰,金月中,林志源 공주대학교 자원재활용신소재지역협력센터 2000 2차년도 센터 사업 성과집 Vol.2000 No.1
추출제로 di-n-hexyl sulfide(DHS)를 사용하여 염산산선용액에서 팔라듐의 용매추출에 대한 실험을 행하였으며 추출제, 팔라듐, Cl-, NO3-, 그리고 HCl의 농도가 팔라듐의 추출에 미치는 영향을 조사하였다. 또한 NH4OH 용액에 의한 유기 상으로부터 팔라듐의 역추출 실험에서 NH4OH 농도, 접촉시간 및 NH4Cl 첨가의 영향을 조사하였다. 팔라듐은 유기상에 PdCl2·2DHS로 추출되었으며 수상의 HCl과 NO3- 농도가 증가함에 따라 추출속도가 감소하였다. 팔라듐의 추출반응은 온도가 증가함에 따라 분배계수가 증가하는 흡열반응이며 ΔH0의 값은 -65.6kJ/mol 이었다. 유기상으로 추출된 팔라듐은 5 M NH4OH 용액을 사용하여 유기상으로부터 완전히 역추출 되었다. The solvent extraction of palladium from aqueous chloride media was carried out using di-n-hexyl sulfide(DHS) known as a selective extractant for palladium. The effects of the concentrations of extractant, palladium, Cl-, NO3-, and HCl on the palladium extraction were investigated. Also, The effects of NH4OH concentration, contact time, and the addition of NH4Cl were examined in the stripping of palladium from the organic phase with NH4OH solution. The result shows that palladium was extracted as PdCl2·2DHS. The initial rates of palladium extraction decreased with the increase of HCl and NO3- concertrations in the aqueous phase. The extraction of palladium with DHS was endothermic with ΔH0 of -65.6 kJ/mol which the distribution coefficient increased with temperature. Palladium in the organic phase was completely stripped with NH4OH solution.
Rhim Ji Won,Bae Seong Youl,Kimura Shoji,Robert Y.M. Huang 한국막학회 1993 멤브레인 Vol.3 No.1
역삼투 및 투과 증발막 분리공정이 nylon 4 blended 막을 사용하여 물-에탄올 계에 대하여 실험적으로 비교되어졌다. 위 두 공저의 이론적 비교를 다루었던 전 논문과 마찬가지로 투과 증발 공정의 분리 효율이 역삼투 공저의 경우 보다 더 좋음을 알 수 있었다. 그러나 투과도 데이타는 막의 결함들로 인하여 엉뚱한 결과를 보였다. Reverse osmosis(RO) and pervaporation(PV) membrane separation proceaes were compared with each other experimentally for the system of water-ethanol mixtures by using nylon 4 blended membranes. The separation effciencies of PV were better than those of RO as expected in previous paper covering the theoretical comparisons of both processes, however tbe permeabilities data showed erraerie results due to the membrane imperfections.
Aging Effect of Poly(vinyl alcohol) Membranes Crosslinked with Poly(acrylic acid-co-maleic acid)
Rhim Ji Won,Hwang Ho Sang,Kim Dae Sik,Park Ho Bum,Lee Chang Hyun,Lee Young Moo,Moon Go Young,Nam Sang Yong The Polymer Society of Korea 2005 Macromolecular Research Vol.13 No.2
Poly(vinyl alcohol) (PVA) membranes crosslinked with poly(acrylic acid-co-maleic acid) (PAM) were prepared to investigate the effect of aging on their morphology by swelling them for up to 7 days. PAM was used both as a crosslinking agent and as a donor of the hydrophilic-COOH group. A $30 wt\%$ weight loss of the dry membrane was observed in the swelling test after 6 days. The surface of the membrane was dramatically changed after the swelling test. The surface roughness of the PVA/PAM membrane was increased, as determined by atomic force microscopy (AFM). The swelling loosened the polymer structure, due to the release of the unreacted polymer and the decomposition of the ester bond, thereby resulting in an increase in the free volume capable of containing water molecules. The water molecules present in the form of free water were determined by differential scanning calorimetry (DSC). The fraction of free water increased with increasing swelling time. The swelling of the membrane may provide space for the transport of protons and increase the mobility of the protonic charge carriers. The proton conductivity of the membranes measured at T= 30 and $50^{\circ}C$ was in the range of $10^{-3} to 10^{-2} S/cm$, and slightly increased with increasing swelling time and temperature.
Gas-Transport Properties through Various Cations Exchanged Sulfonated Poly(ether imide) Membranes
Rhim, Ji-Won The Membrane Society of Korea 2001 Korean Membrane Journal Vol.3 No.1
The surface of Poly(ether imide) (PEI) membranes has been sulfonated using CIS03H. The resulting membranes were characterized through the analysis of ESCA and contact angle measurements The sulfonated PEI membranes were exposed to gases of $O_2$, $N_2$, and $CO_2$ to measure the permeation rates and ideal separation factors. In addition, the diffusivities and solubilities of individual gases were measured. The diffusivity effect is more dominant than the solubility one on gas transports.
pH-sensitive Swelling Behavior of Poly(vinyl alcohol)-hyaluronic Acid Polymer Hydrogel Membranes
Ji, Hye Won,Chon, Se Won,Yoon, Tae Il,Hwnag, Ho Sang,Kwon, Ji Young,Shin, Seung Hoon,Chung, Sung Il,Rhim, Ji Won The Membrane Society of Korea 2004 Korean Membrane Journal Vol.6 No.1
Poly(vinyl alcohol)(PVA) and hyaluronic acid(HA) hydrogel membranes were prepared with varying HA contents from 10 to 50 wt% of PVA. The water contents of the resulting PVA-HA hydrogel membranes in various pH conditions were measured. And the permeation coefficient of indomethacin was determined using several PVA-HA hydrogel membranes at various pH conditions and also 37$^{\circ}C$.
Rhim Ji Won,Lee Kew Ho,Bae Seong Youl,Robert Y.M. Huang 한국막학회 1993 멤브레인 Vol.3 No.1
본 논문에서는 역삼투막 공정과 투과 증발막 공정이 Paul과 Ebra-Lima 모델을 사용하여 이론적으로 서로 비교되어졌다. 이 모델로부터 막내에 있는 액의 농도를 역삼투 공정의 경우 압력이 막의 윗쪽에 가하여졌을 때 (반면에 투과 증발 공정의 경우는 가하여진 압력이 무한대일 때) 막 -n-hexane 그리고 rubber 막-benzene 계들에 대하여 계산되어졌다. 또한 polyethylene-n-hexane 그리고 polyethlene-benzene 계들에 대하여 역삼투 및 투과 증발 공정의 투과도가 계산되어졌고 비교되어졌다. 이론적으로는, 투과 증발 공저으이 투과도가 역삼투 공저의 투과도 보다 더 컸음을 알 수 있었다. Reverse osmosis(RO) and pervaporation(PV) membrane processes were compared with each other theoretically by using Paul and Ebra-Lima model. From this model the concentrations of liquid within the membrane when pressure was applied to the upper compartment(for PV case, the applied pressure is infinite) were calculated for rubber membrane-n-hexane and rubber membrane-benzene systems. The permeabilities of RO and PV were also calculated and compared for polyethylene film-n- hexane and polyethylene film- benzene systems Theoretically, the permeabilities of PV membrane were greater than those of RO membrane.
Pervaporation Separation of Trace VOCs from Water Through PDMS Membranes
Rhim, Ji-Won,Kwon, Young-Mann The Membrane Society of Korea 1999 Korean Membrane Journal Vol.1 No.1
The removal of trace chlorinated and aromatic hydrocarbons from water by a pervaporation technique has been carried out through poly (dimethylsiloxane) membrane which had been fabricated by the addition crosslinking reaction. This study dealt with the swelling and permeation behaviors of the PDMS membranes with dichloroethane trichloroethane and toluene aqueous solutions. The swelling ratio in the toluene aqueous solution was much higher than those in the chloroethane solutions at all of the operating temperatures and concentrations. The solubility parameter theory was introduced to interpret the affinity between permeates and a membrane material and in all cases this approach seemed to be proper. It was suggested that the existence of water clusters in the membrane due to the hydrophobic characteristics of the membrane made the size of the permeating water larger resulting in suppressing water permeation and increasing enrichment of the organic components. The permeation behaviors at different membrane thicknesses were indirectly interpreted in terms of the effect of concentration polarization.