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NTIS 바로가기Journal of environmental science international = 한국환경과학회지, v.23 no.5, 2014년, pp.943 - 962
김문현 (대구대학교 환경공학과) , 조일흠 (대구대학교 환경공학과) , 최상옥 (삼성비피화학(주) 시험연구팀) , 추수태 (삼성비피화학(주) 시험연구팀)
Industrial gas drying, dilute gas mixtures purification, air fractionation, hydrogen production from steam reformers and petroleum refinery off-gases, etc are conducted by using adsorptive separation technology. The pressure swing adsorption (PSA) has certain advantages over the other methods, such ...
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핵심어 | 질문 | 논문에서 추출한 답변 |
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다공성 흡착제의 목적은 무엇인가? | 다공성 흡착제(adsorbent)들은 기체혼합물들을 구성하고 있는 각 기체성분별로 분별하기 위한 분리(separation)와 기체혼합물들 내에 존재하는 미량의 특정 기체 성분을 원하는 수준까지 낮추기 위한 정제(purification)를 목적으로 하는 기체 분리정제산업 분야에서 널리 사용되고 있다. 기체혼합물들의 분리·정제를 위해 사용되는 흡착공정들은 기체성분들의 강한 화학흡착(chemisorption)이 아닌 가역성을 갖는 물리흡착(physisorption)이나 매우 약한 화학흡착의 원리를 이용하기 때문에, 흡수공정(absorption)에 비해 에너지효율 측면에서 많은 장점을 가지고 있다(Yang, 2003; D'Alessandro 등, 2010). | |
기체 분리․정제 분야에서 전동적으로 널리 사용되어져 온 흡착제들은 무엇인가? | 따라서, 흡착제들을 구성하는 물질의 종류, 골격(framework), 세공성(porosity), 채널구조(channel structure), 세공크기(pore size), 비표면적(specific surface area) 등등의 물리화학적 요소들 뿐만 아니라, 피흡착제인 기체분자들이 가지고 있는 분자크기, 분극률(polarizability) 등과 같은 물리화학적, 전자적 특성들도 기체혼합물 흡착분리용 흡착제 개발에 있어서 매우 중요하게 고려되어야 할 것이다(Li 등, 2009; D'Alessandro 등, 2010; Kim 등, 2013). 다공성 제올라이트, 활성탄(activated carbon, AC), 알루미나, 실리카겔 등은 기체 분리․정제 분야에서 전통적으로 널리 사용되어져 온 가장 대표적인 흡착제들이며, 최근에는 탄소분자체(carbon molecular sieve, CMS), 금속-유기 골격체(metal-organic framework, MOF)와 제올라이트 이미다졸 골격체(zeolitic imidazolate framework, ZIF)가 CO2, H2 등의 새로운 흡착제로서 활발히 연구되고 있다(Yaghi 등, 1995; Tagliabue 등, 2009; Park 등, 2006; Kim 등, 2013). | |
temperature swing adsorption에서 사용하는 온도순환방식은 무엇인가? | 이때 흡착제의 재사용을 위해 흡착공정 종료 후 적합한 방법으로 흡착된 CO2를 탈착시키는 흡착제 재생(regeneration) 공정이 요구되는데, 탈착을 위한 driving force에 따라 PSA, 온도순환흡착(temperature swing adsorption, TSA), 불활성 기체에 의한 purge 등으로 구분될 수 있고, PSA와 TSA 기술이 가장 널리 적용되고 있다(Yang, 2003). PSA 기술의 경우 흡착제에 가해진 기체혼합물의 압력을 감소시키거나 기체혼합물 중 원하는 기체성분으로 분리된 흐름의 일부를 다시 흡착탑에 도입시킴으로써 흡착제를 재생시키는 방법을 적용하는 반면에, TSA에서는 이러한 흡착제 재생 driving force로 기체분자들의 흡착을 낮은 온도에서 수행하고 상대적으로 높은 온도에서 흡착된 기체분자들을 탈착시키는 온도순환방식을 사용한다. 흡착효율, 운영비를 포함한 경제성 등을 고려할 때, 기체혼합물을 구성하고 있는 기체성분들 간의 조성차이가 크지 않거나 CO2 대비 흡착정도가 현저한 차이를 보이면 일반적으로 PSA 기술을 적용한다(Yang, 2003; Tagliabue등, 2009). |
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