화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of the Korean Industrial and Engineering Chemistry, Vol.11, No.8, 929-935, December, 2000
Export Citation
HEMA로 개질된 폴리프로필렌 정밀여과막에 의한 오일에멀젼의 분리특성
Separation Characteristics of Oil-emulsion Using Polypropylene Microfiltration Membrane Modified with HEMA
구병준†, 이근후1, 이재원1, 최왕규1, 박소진
  • 충남대학교 화학공학과, 대전 305-764
  • 1한국원자력 연구소 화학공학과, 대전 305-606
Byoung Jun Ku†, Kune Woo Lee1, Jae Won Lee1, Wang Kyu Choi1, and So Jin Park
  • Department of Chemical Engineering, Chungnam National University, Taejeon 305-764, Korea
  • 1Department of Chemical Engineering, Korea Atomic Energy Research Institute, Taejon 305-606, Korea
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초록
십자형 흐름의 막분리 공정에서 그라프트 중합에 의해 2-hydroxyethyl methacrylate (HEMA)로 친수화한 관형의 polypropylene (PP) 정밀여과막을 사용하여 모의 오일에멀젼 폐액의 투과 거동 및 막오염 특성에 대한 연구를 수행하였다. 개질된 막의 그라프트율 및 막간 차압, 유속, 에멀젼 농도등을 포함하는 여러 가지 공정인자가 오일에멀젼 폐액의 정밀여과 거동에 미치는 영향을 조사하였고, standard blocking model (SBM) 및 cake filtration model (CFM)을 적용하여 막오염 특성을 평가하였다. 그라프트율과 압력의 증가에 따라 투과속도는 크게 증가하였으나 조업초기 30 min 이내에 급격히 감소하였으며 조업 초기 단계에서 투과속도의 감소율은 더 크게 나타났다. 계면활성제를 포함한 오일에멀젼 용액의 막투과 속도는 막의 표면 특성에 따라 매우 다른 결과를 나타내었다. 메탄올로 처리한 원래의 PP막은 sodium dodecyl sulfate (SDS)의 첨가에 의해서 투과속도가 크게 증가한 반면, HEMA-g-PP막에서는 크게 감소되었다. 막오염 현상을 평가한 결과 그라프트율이 증가함에 따라 내부오염이 더 오랜 시간 동안 진행되었으며, 오일 농도가 증가할수록 내부오염에서 외부오염으로의 전환이 더 빨리 일어남을 알 수 있었다.
A study on the permeation behavior of simulated waste water containing oil emulsion and characterization of membrane fouling was carried out in a crossflow membrane filtration process. A capillary type polypropylene (PP) microfiltration membrane modified by radiation induced grafting of 2-hydroxymethyl methacrylate (HEMA) was used. The effects of various process parameters, such as degree of graft, transmembrane pressure, crossflow velocity, concentrations of oil, and the surfactant on the permeation flux were investigated. Characteristics of the membrane fouling were evaluated using the standard blocking model (SBM) and the cake filtration model (CFM). As the degree of graft and the transmembrane pressure were increased, the flux which had reduced during first 30 minutes of the operation, increased significantly. However, the rate of flux decline, in the early stage of operation, was much greater than the incline. The flux of oil emulsion containing the surfactant showed different results depending on the surface properties of membrane. In the case of PP membrane wetted with methanol, the flux increased by adding sodium dodecyl sulfate (SDS) as the surfactant, but the membrane modified with HEMA greatly reduced the flux. Through the evaluation of membrane fouling during filtration, it was shown that the internal fouling remained for a longer period with an increased degree of graft, and the conversion of internal to external fouling occurred more rapidly with increased concentration of oil.
Keywords:Crossflow Microfiltration;Polypropylene mf membrane;Oil-emulsion;Degree of graft
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