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최영국,김광제,이수복 ( Young Kook Choi,Kwang Je Kim,Soo Bok Lee ) 한국화학공학회 1989 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.27 No.5
A PVA pervaporation membrane, which has preferential selectivity for water, was introduced. For the separation of ethanol-water mixtures above 90 wt% of ethanol, the membrane exhibited selectivity above 50 and permeability of 0-0.4 ℓ/hr·㎡, The membrane surface area required for the production of 360 ㎏/hr absolute ethanol from 93 wt% ethanol-water mixture by the pervaporation process using the membrane was estimated as 163 ㎡. In this case, the average ethanol concentration was calculated as 13.5 wt%. The energy cost of pervaporation process was compared with that of azeotropic distillation process using benzene as an entrainer. As a result, it is confirmed that the energy cost of pervaporation process is merely 115 of that of azeotropic distillation process.
공업화학 촉매 / 반응공학 : MMA 와 FA 공중합체 분리막 제조 및 기체투과 특성
김민수(Min Soo Kim),이용택(Yong Taek Lee),이동진(Dong Jin Lee),최영국(Young Kook Choi),이수복(Soo Bok Lee) 한국화학공학회 1999 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.37 No.5
The gas permeation was experimentally carried out for the various gases with membranes made of methyl methacrylate(MMA) and fluoro acrylate(FA) copolymer. Particularly the effect of fluoro functional group on the gas permeability of the membrane was investigated with various FA contents. It turned out that the surface free energy of the membrane was significantly decreased as the FA content increased, resulting in very unique properties with respect to the permeability and the selectivity of gas. P(MMA-FA) membranes showed that its permeability was 2 to 20 times higher than that of the PMMA membrane for the typical gases of H₂, CO₂, O₂, N₂ and CH₄ while its selectivity was kept to be almost comparable to those of the PMMA membrane. The optimum content of FA was found to be in the range of 1 to 5 wt%.
Pervaporation 공정 Scale - Up 에 있어서의 분리막 표면적의 계산방법
이수복,이철호,최영국 한국화학공학회 1989 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.27 No.1
이성분 혼합물의 pervaporation에 있어서, 실험실적 규모로 측정된 공급액 조성에 따른 투과액 조성 변화 및 투과속도 변화 자료를 이용하여 scale-up시에 필요로 하는 분리막 표면적과 투과액의 평균 농도를 산출할 수 있는 방법을 제안하였다. In pervaporation of binary mixtures, a method has been proposed for the calculations of membrane surface area and average permeate composition when scaling up. For the method required are data on permeate composition and permeate flux measured as a function of feed composition in laboratory-scale experiments.
불소기를 포함한 폴리이미드막의 혼합에 따른 물성과 기체투과특성
김정훈,김상율,이수복,김동권,최영국,박인준,손우익 한국공업화학회 2000 응용화학 Vol.4 No.1
The effects of incorporation of fluorinated alkyl side groups into polyimide membranes were investigated in terms of their physical and gas permeation properties. Four polyimides with fluorinated side groups and four polyimides without the side groups were prepared by polycondensation of 2-(perfluorohexyl)ethyl-3, 5-diamino benzoate (PFDAB) and m-PDA with four aromatic dianhydrides(6FDA, ODPA, BTDA and PMDA), respectively. It was found that the incorporation of fluorinated side groups into the polyimide membranes decreased their T_(g)s, surface free energies, solubility parameters and fractional free volume(FFV)s and therefore, enhanced the permeabilities for CO₂, O₂, N₂ and CH₄ gases but reduced the selectivities for CO₂/ CH₄, O₂ /N₂ , CO₂/N₂ gas pairs depending upon the structure of dianhydride monomers.
불소함유 폴리실록산이미드공중합체막의 물속의 VOCs 의 분리특성
김정훈,이희우,이수복,김동권,최영국,박인준,장연희,손우익 한국공업화학회 2000 응용화학 Vol.4 No.1
For remove Volatile Organic Compounds(VOCs) in water which occur water pollution, siloxane-imide copolymer membranes with perfluorinated side group were prepared and were investigated good physical properties and perm-selectivities. As getting the portion of siloxanediamine in copolymer membrane, it has the higher selectivities and the better permeation properties of VOCs. and was found the superior permeation characteristic of the hydrophobic toluene.