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폴리설폰 중공사막 구조에 대한 조용매 γ-Butyrolactone 첨가 영향
윤석복 ( Suk Bok Yun ),이용택 ( Yong Taek Lee† ) 한국공업화학회 2014 공업화학 Vol.25 No.3
Polysulfone (PSf) hollow fiber membranes were prepared via the nonsolvent induced phase separation technique. The cosolventof γ-butyrolactone (GBL) was added to the polymer solution containing a mixture of PSf and N,N-dimethylacetamide(DMAc). Water was utilized as a precipitation nonsolvent. The morphology of prepared membranes was investigated usinga field emission scanning electron microscopy. The fabricated membrane showed a typical asymmetric structure such as thedense layer on the porous support layer by the addition of GBL to the polymer solution. As the concentration of GBL increased,the asymmetric porous structure was shown to be more intensified. It was thought that the added GBL played a roleof enhancing the liquid-liquid phase separation of the polymer solution, since the cosolvent of GBL might change the thermodynamicsolubility parameter of the doping solution. Permeation properties through the prepared hollow fiber membranes werecharacterized by measuring the pure water flux and the solute rejection using 0.05 μm polystyrene latex (PSL) beads. Experimental results revealed that the use of PEG as the internal coagulant enhanced the pure water flux up to 130 timescompared to the use of EG while the rejection of the PSL beads decreased only 5%.
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염충균,윤석복,박유인,Yeom, Choong-Kyun,Yoon, Seok-Bok,Park, You-In The Membrane Society of Korea 2008 멤브레인 Vol.18 No.4
This study was focused on the investigation of the effects of membrane module configuration and the temperature of feed retentate flowing along with module length on membrane performance through model simulation. A simulation model of pervaporative dehydration through membrane module assemble in which a number of unit modules are connected in parallel or in series has been established. In this study, ethanol/water mixture was used as model mixture. Some of permeation parameters in the model were quantified directly from the real dehydration pervaporation of ethanol through a lab-made membrane. By adopting the coefficients determined empirically the simulation model could be of more practical value. The simulation of pervaporation with two basic module configurations, that is, parallel connection and series connection, could present the importance of process parameters such as feed rate, module connection mode, number of stages, and inter-stage heating. 본 연구는 공정모사를 통해서 막모듈 배열 및 연결과 막모듈 내에서 공급 잔류액의 온도 변화가 투과증발 공정에 끼치는 영향을 관찰하였으며 이를 위해서 기본 막모듈이 직렬 혹은 병렬로 연결되어 있는 모듈들의 조합을 통한 투과탈수공정을 예측할 수 있는 모델식들을 확립하였다. 에탄올/물 혼합물을 모델 혼합물로 사용하였고 모델식들에 포함되어 있는 투과 파라메타들을 직접 실험에 의해 구하여 사용함으로써 모사의 현실성을 높였다. 모사를 통해서 모듈의 배열방식, 모듈 단의 갯수와 단사이의 공급액의 재가열등의 중요성을 검토하였다.
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