실리콘 막을 이용한 페놀 - 물 혼합물의 투과 증발 분리

임지원,손민영,이규호 ( Ji Won Rhim,Min Young Sohn,Kew Ho Lee ) 한국공업화학회 1994 공업화학 Vol.5 No.5

The pervaporation separation experiments of phenol-water mixtures were carried out by using Type 1 (PDMS : crosslinking agent=1 : 0.25) and Type 2 (PDMS : crosslinking agent=1 : 0.35) silicone rubber membranes at 30, 40 and 50℃. The phenol concentrations in the feed to be separated were 500ppm to 5wt%. Type 2 membranes were more efficient than Type 1 membranes for the separation of phenol-water mixtures. The phenol concentration of 70wt% was obtained for 5wt% of phenol concentration in the feed at 30℃ and 11wt% phenol concentration observed for 500ppm of phenol concentration in the feed at 30℃ by using Type 2 membranes.

나일론 4와 이의 블렌드 막을 이용한 에탄올 - 물 혼합물의 투과 증발분리

임지원,로버트황 ( Ji Won Rhim,Robert Y . M . Huang ) 한국공업화학회 1993 공업화학 Vol.4 No.4

The application of the pervaporation process in biotechnology is rapidly growing. A two stage pervaporation process can be applied to the downstream processing of ethanol fermentation. In this paper, the second stage process in which the water-ethanol composition was 50:50 wt.% was investigated in more detail by using Nylon 4 and its blended membranes containing poly(vinyl alcohol) (PVA) and poly(acrylic acid) (PAA). Nylon 4 membranes were tested for compositions at 25, 30, and 35℃. Nylon 4 membranes had a separation factor of 4.18 with a permeability of 0.69 ㎏/m^2hr at water-ethanol composition of 50:50 wt.%, while nylon 4-PVA blended membranes crosslinked by 5 Mrad gammaray irradiation showed a higher separation factor of 10.56 with permeability 0.55 ㎏/m^2hr at the same composition. Nylon 4 also showed a high separation factor 27.8 at the ethanol-water azeotropic composition among the homopolymer membranes.

역삼투막 표면의 양이온 교환 고분자 코팅에 의한 파울링 감소 연구

임지원(Ji Won Rhim),박찬종(Chan Jong Park),김성표(Sung Pyo Kim),정성일(Seong Ihl Cheong) 한국고분자학회 2012 폴리머 Vol.36 No.6

The cation exchange polymer, poly(styrene sulfonic acid) (PSSA), was coated onto polyamide (PA) thin film composite reverse osmosis (RO) membranes. Then these membranes were investigated for the model foulants, bovine serum albumin (BSA), humic acid (HA), and sodium alginate (SA) to check whether there are some improvement. The contact angle of PSSA coated PA RO membrane showed 58o from 78o, the value of PA RO membrane, which confirmed successful hydrophilization. As the operating pressure increased (2, 4, 8 atm for BSA, HA and SA 100 ppm in feed solution), the fouling phenomena was worse for both none- and PSSA-coated membranes. The fouling increased in the order of BSA>SA>HA due to the interactions between sulfonic acid in PSSA and functional groups of foulants. On the other hand more significant fouling reduction was observed in the order of HA>SA>BSA. The photographs of scanning electron microscopy showed the same trend. As a result, there was the improvement of fouling phenomena for the PSSA coated RO membranes, distinctly in the case of HA.

축전식 탈염공정에서 탄소전극에 코팅된 이온교환 고분자의 두께와 탈착전위가 탈착 성능에 미치는 영향

임지원(Ji Won Rhim) 한국고분자학회 2020 폴리머 Vol.44 No.5

The effects of the thickness of the ion exchange polymers onto the carbon electrodes and the reverse potential applied on the desorption process in the membrane capacitive deionization process were investigated. Poly(ether ether ketone) (PEEK) was used as the cation exchange polymer while polysulfone (PSf) was used as the anion exchange polymer. The single and double coatings of the ion exchange polymers were carried out and the reverse potentials of -0.3, -0.5, -1.0 V were used. As the reverse potential was larger for the pristine carbon electrode, it took for a longer time to reach the 0 of the effluent concentration. The high effluent concentration of ca. 420 mg/L for the double coated electrode was shown. In the desorption process, the larger reverse potential was favorable since the time to the 0 effluent concentration took shorter as the reverse potential increased.

초저압용 나노중공사 복합막의 제조

임지원(Ji Won Rhim) 한국고분자학회 2020 폴리머 Vol.44 No.5

Nanofiltration hollow fiber composite membranes were prepared through the salting-out method by coating poly(vinyl amine) (PVAm) onto polysulfone hollow fiber membrane surface while varying the conditions of coating time, ionic strength, drying temperature, and crosslinking concentration. The resulting membranes were measured in terms of flux and rejection for NaCl 100 ppm and CaSO₄ 100 ppm aqueous solutions. The rejection of CaSO₄ for all prepared membranes was higher than that of NaCl due to the size and donnan exclusion effects. On the other hand, the flux for CaSO₄ was higher than for NaCl since it is considered the swelling by -NH₂ in PVAm provides free passage of divalent ions, CaSO₄. Typically, 22 LMH flux and 74% rejection for NaCl and the 29 LMH flux and 92% rejection, respectively, were obtained for the NF membrane prepared at the conditions of ionic strength at 0.2, crosslinking concentration of 0.7%, coating time of 30 s, drying temperature at 80℃ and drying time of 20 min.

함산소불소화법을 통한 다공성 폴리에틸렌막의 파울링현상 감소연구

강수연,임지원,정성일,Kang, Su Yeon,Rhim, Ji Won,Cheong, Seong Ihl 한국막학회 2014 멤브레인 Vol.24 No.6

To overcome the flux reduction due to the fouling by adsorption of foulants onto the porous hydrophobic polyethylene membrane surface, the oxyflorination was introduced to hydrophilize the hydrophobic membranes. After the hydrophilization through oxyfluorination, the contact angle decreased from $93^{\circ}$ to $50^{\circ}$ while the water flux increased to 60%. It was considered that for the model foulants dissolved in water, such as albumin (form bovine serum, BSA), humic acid sodium salt (HA), and alginic acid sodium salt (SA), the flux was enhanced since the adsorbed foulants decreased by the oxyfluorination. Particularly, it was obtained that the water flux was over twice more than the untreated polyethylene membrane in case of SA foulant.

아민화된 폴리이서이미드 막을 이용한 이산화탄소의 촉진수송분리

권세환,임지원,Kwon, Se Hwan,Rhim, Ji Won 한국막학회 2015 멤브레인 Vol.25 No.3

Aminated polyetherimide membrane synthesized in the laboratory according to amine ratio was used for measurement of gas permeability, diffusivity, and solubility about carbon dioxide, nitrogen, methane, oxygen, and sulfur dioxide with Time-lag method at room temperature. Generally, gas permeability is totally decreased because the more amination rate reacted to the main chain of amine groups, the more intermolecular space became narrow. However, gas permeability of sulfur dioxide was increased due to combination of sulfur dioxide and amine groups have acid and base properties respectively. Diffusivity and solubility of dry gas are totally decreased excluding sulfur dioxide as increasing amination rate. In case of sulfur dioxide, however, diffusivity as well as solubility was increased as increasing amination rate. Selectivity of carbon dioxide/nitrogen showed 60 when amination rate was 3. In case of humid gas, gas permeability of carbon dioxide was 70 barrer when relative humidity showed 100, and selectivity with nitrogen approximately showed 18.

막 결합형 축전식 탈염공정을 이용한 수용액 중 방사성 이온의 제거 연구

윤원섭(Won Seob Yun),임지원(Ji Won Rhim) 한국고분자학회 2017 폴리머 Vol.41 No.4

In this study, sulfonated poly(ether ether ketone) and aminated polysulfone as ion exchange materials were synthesized. The composite carbon electrodes coated with ion exchange polymers onto carbon electrodes were prepared and then the applicability of the membrane capacitive deionization (MCDI) was evaluated for the solution containing CsNO₃ and Sr(NO₃)₂ of radioactive ions in water. The absorption time and voltages, desorption time and voltages, feed concentration and flow rate as the operating conditions were investigated in terms of the decontamination efficiency. The decontamination efficiency, 98.5%, was obtained for the feed concentration, CsNO₃ 20 mg/L containing monovalent ion at 1.5 V and 3 min for adsorption voltage and time, and -0.1 V and 1 min for desorption voltage and time. At the same operating conditions, the decontamination efficiency, 94.8%, was achieved for Sr(NO₃)₂ 20 mg/L solution as the bivalent ion.

흡착전압과 코팅된 이온교환막 두께가 막 결합형 축전식 탈염공정에서 흡착성능에 미치는 영향

윤원섭(Won Seob Yun),임솔빈(Sol Bin Lim),임지원(Ji Won Rhim) 한국고분자학회 2018 폴리머 Vol.42 No.6

The effects of the thickness of the ion exchange layers on carbon electrodes have been studied on the adsorption performance through the operating time to the maximum adsorption and effluent concentrations at the desorption in the membrane capacitive deionized processes. The thicknesses of the ion exchange layers were adjusted with the number of times from 1, 2, and 3 times using 8 wt% of ion exchange polymer solutions. As the thickness of the ion exchange layers on carbon electrodes increased, the minimum concentrations of the effluents increased since the adsorption was not satisfactorily carried out due to the limited movements of ions in feed within the coating layers. The times to the maximum adsorptions were 80 min for one time coating and 174 and 242 min for two, three times coatings, respectively. It was interesting that the linear relationship was found between the thickness of the coating layers and the times to the maximum adsorption.

직접 메탄올 연료전지 적용을 위한 PVA 기반 양이온교환막 제조 및 특성연구

전이슬,김가영,임지원,Jeon, Yi Seul,Kim, Ka young,Rhim, Ji Won 한국막학회 2015 멤브레인 Vol.25 No.2

The water-soluble poly(vinyl alcohol) membranes with the addition of sulfosuccinic acid (SSA) were prepared and to assign the ion exchange capacity, poly(4-styrene sulfonic acid-co-maleic acid) (PSSA_MA) was added to PVA according to PSSA_MA contents of 70, 80 and 90 wt%. To characterize the resulting membranes, FT-IR, water contents, ion exchange capacity, proton conductivity and methanol permeability were measured. As PSSA_MA contents increased, water contents, ion exchange capacity, proton conductivity increased, but methanol permeability decreased. From these results, the best preparation component was known as PVA10/SSA9/PSSA_MA80.