• Korean Chemical Engineering Research
• /
• 제46권1호
• /
• pp.164-169
• /
• 2008

본 연구에서 매개체로 $Ag^+$ 이온을 사용하고 polycarbonate 지지체 위에 sulfonated poly(ether ether ketone)(SPEEK) 코팅하여 촉진 수송 분리막을 제조하여 propylene/propane의 분리에서 막의 두께와 은의 농도의 영향을 알아보았다. PEEK와 황산을 이용하여 SPEEK를 합성하고 MeOH에 녹여 농도별(5, 10, 15, 20 wt%)로 polycarbonate 지지체 위에 코팅하였고, 은 수용액에 함침 시킨 후 어두운 곳에서 건조하여 사용하였다. 실험 결과, 막의 두께 증가하면 선택도는 증가하였고 투과 성능은 감소하였다. 또한 은의 농도가 증가할수록 선택도는 증가 하였으나, 투과 성능을 크게 변화 시키지는 않았다.

• 한국대기환경학회:학술대회논문집
• /
• 한국대기환경학회 2004년도 춘계학술대회 논문집
• /
• pp.194-196
• /
• 2004

• 한국막학회:학술대회논문집
• /
• 한국막학회 2004년도 첨단 분리막 연구동향
• /
• pp.13-35
• /
• 2004

Metal Complexes in Macromolecules Applications of Polymer Electrolyte Membranes Facilitated Transport in Solid State Roles of Electrolytes in Solar Cells - Electrolytes :ㆍI- and $I_3$-conductor ㆍelectron barrier or hole conductor ㆍelectrochemical redox reaction media ㆍinterfacial contactor for dye, $TiO_2$ and electrode ㆍmechanical separator (omitted)

• Macromolecular Research
• /
• 제12권6호
• /
• pp.598-603
• /
• 2004

Cellulose nitrate (CN) composite membranes, containing cobalt porphyrin (CoP) complexes self-assembled within nanometer-sized rhenium clusters (ReCoP), have been prepared and their oxygen and nitrogen gas perme­abilities were analyzed. The solubility of ReCoP and the characteristics of the corresponding composite membranes were analyzed using a Cahn microbalance, FT-IR spectroscopy, wide-angle X-ray scattering, and differential scanning calorimetry. The nitrogen permeability through the CN composite membranes decreased upon addition of ReCoP and CoP, which implies that the presence of these oxygen carrier complexes affects the structure of the polymer matrix. The oxygen permeability through the composite membranes containing small quantities of ReCoP decreased, but it increased upon increasing the concentration. The oxygen gas transport was affected by the matrix at low ReCoP concentrations, but higher concentrations of ReCoP increased the oxygen permeability as a result of its reversible and specific interactions with oxygen, effectively realizing ReCoP carrier-mediated oxygen transport.

• 생명과학회지
• /
• 제4권4호
• /
• pp.170-175
• /
• 1994

The glucose transport across the mammalian plasma membranes is carried out by members of two distinct gene families, $Na^+$/glucose to transporter (SGLT) and glucose transporters (GLUTs). The energy requiring SGLT utilizes the sodium gradient to transport glucose and galactose against the concentration gradient. The energy independent transport (Facilitative transport) of glucose down the concentration gradient is mediated by the members of GLUTs. The facilitated transport of glucose is saturable, sterospecific and bidirectional across the membrane. To date, 6 kinds of isoforms of facilitative glucose transporters are found. These proteins are expressed in a tissue and cell specific manner, and shows distinct properties that reflect their specific functional roles.

• 멤브레인
• /
• 제24권5호
• /
• pp.409-415
• /
• 2014

본 연구에서는 석유화학공정 중에서 많은 에너지를 소비하는 NCC(Naphtha Cracking Center) $C_3$ splitter를 대신하여 에너지 소비가 적고 친환경 공정인 막분리법을 이용하여 프로필렌/프로판의 분리특성을 예측하고자 한다. 막소재로는 프로필렌/프로판 분리에 대하여 우수한 성능을 나타내는 것으로 잘 알려진 촉진수송막을 사용하였다. 실험에 사용된 촉진수송막은 한양대학교에서 제조한 은나노입자가 함유된 VP/$AgBF_4$/TCNQ 용액을 에어레인에서 다공성 폴리이서이미드 중공사에 얇게 코팅하여 소형 중공사 막모듈로 제작하였다. 제작된 촉진수송막 모듈의 투과성능을 평가하기 위하여 프로필렌과 프로판에 대한 단일기체 테스트를 진행하였다. 분리막의 투과현상을 예측하기 위하여 전산모사 프로그램을 개발하였다. 개발된 전산모사 프로그램에 단일기체 테스트를 통해 얻어진 투과도와 선택도를 이용하여 95/5 vol% $C_3H_6$ / vol% $C_3H_8$ 혼합가스를 공급하였을 경우, 공급측 및 투과측 압력 변화에 따른 투과측 프로필렌의 농도가 99.5 vol%를 유지하는 단일 분리막 공정을 설계하였다.

• Membrane and Water Treatment
• /
• 제2권4호
• /
• pp.207-223
• /
• 2011

Supported Liquid Membranes (SLMs) have been widely studied as feasible alternative to traditional processes for separation and purification of various chemicals both from aqueous and organic matrices. This technique offers various advantages like active transport, possibility to use expensive extractants, high selectivity, low energy requirements and minimization of chemical additives. SLMs are not yet used at large scale in industrial applications, because of the low stability. In the present paper, after a brief overview of the state of the art of SLM technology the facilitated transport mechanisms of SLM based separation is described, also introducing the small and the big carrousel models, which are employed for transport modeling. The main operating parameters (selectivity, flux and permeability) are introduced. The problems related to system stabilization are also discussed, giving particular attention to the influence of membrane materials (solid membrane support and organic liquid membrane (LM) phase). Various approaches proposed in literature to enhance SLM stability are also reviewed. Modification of the solid membrane support, creating an additional layer on membrane surface, which acts as a barrier to LM phase loss, increases system stability, but the membrane permeability, and then the flux, decrease. Stagnant Sandwich Liquid Membrane (SSwLM), an implementation of the SLM system, results in both high flux and stability compared to SLM. Finally, possible large scale applications of SLMs are also reviewed, evidencing that if the LM separation process is opportunely carried out (no production of byproducts), it can be considered as a green process.

• Biotechnology and Bioprocess Engineering:BBE
• /
• 제3권1호
• /
• pp.24-31
• /
• 1998

The separation and concentration of L-phenylalanine (L-Phe) using a supported liquid membrane (SLM) is investigated. A cation complex agent, di-2-ethylhexyl phosphoric acid (D2EHPA), is used as a carrier in the SLM with n-Heptane as a solvent. The reaction order and equilibrium constant in the formation reaction of L-phe-carrier complex are obtained from the extraction experiment. A mathematical model for a carrier mediated counter transport process is proposed to estimate the diffusion coefficient of L-phe-carrier complexly in the liquid membrant. Permeation experiments of L-phe using a SLM are performed under various operating conditions and optimum conditions for the transport of L-phe are obtained. Concentration of L-phe in the strip phase against its concentration is observed. Transport rate of glucose through liquid membrane is less than that of L-phe in the competitive transport of L-phe and glucose. And the existence of glucose reduced the transport rate of L-phe. The performance of separation with continuous strip phase is increased due to the dilution effect in the strip phase.

• 한국막학회:학술대회논문집
• /
• 한국막학회 2003년도 추계 총회 및 학술발표회
• /
• pp.85-88
• /
• 2003

• 한국막학회:학술대회논문집
• /
• 한국막학회 1992년도 추계 총회 및 학술발표회
• /
• pp.37-38
• /
• 1992

혼합물 중의 특정 분자와 선택적, 가역적으로 반응하는 운반체를 이용한 촉진 수송법은 분리막의 투과도와 선택도를 동서에 증가시킬 수 있는 한 방법으로 많은 연구가 진행되어 왔다. 촉진수송의 개념은 처음 액막에서 발견되었으나 근래에는 고체막에서도 가능하다는 보고들이 있다. 액막의 경우는 이 현상을 설명하는 모델들이 다수 보고되었으나 운반체가 고정되어 있는 고체막에 대한 보고는 아직 초보적인 단계이다.