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1LH-6 Development of a Heat Integrated Solid Sorbent-based CO<sub>2</sub> Capture Process
서휘민,김기웅,박용기,이광순,조형희 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
Solid sorbent-based CO<sub>2</sub> capture processes are actively being developed as a post-combustion CO<sub>2</sub> capture technology because of its advantages such as less corrosiveness, less volatility, and low regeneration energy. We developed a heat integrated CO<sub>2</sub> capture process using PEI-based solid sorbents. This process uses a circulating fluidized bed for absorber and regenerator to enhance mass transfer between gas and solid phases. It includes a novel solid-solid direct heat exchanger of shell and tube type for reducing sensible energy. Because this heat integrated process is nonconventional, its process design is difficult without a bench or a pilot scale demonstration. We focus on how process simulation and computational techniques were utilized for designing and analyzing bench scale facility. Afterward, based on 20 N㎥/hr scale bench facility operations, energy consumptions and a key parameter affecting process performance are discussed.
서휘민,민다영,강나영,최원춘,박선영,박용기,이득기 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.1
For the development of a dry solid sorbent having quite fast CO2 sorption kinetics in an intermediate tem-perature range of 245-300 oC to be applicable to a riser-type fluidized bed carbonator, samples of Al2O3-supportedMgCO3 (1.2mmol/g) promoted with different molar amounts of Na2CO3 (1.2, 1.8mmol/g) and/or NaNO3 (0.6mmol/g) were prepared by incipient wetness pore volume impregnation. For a reference, an unsupported bulk phase sorbentof NaNO3-Na2Mg(CO3)2 was also prepared. From the sorption reaction using a gas mixture containing CO2 by 2.5-10% at 1 bar for the sorbents after their activation to MgO, Al2O3-supported sorbents were featured by their rapid car-bonation kinetics in contrast to the unsupported sorbent showing a quite slow carbonation behavior. The addition ofNa2CO3 to the MgCO3/Al2O3 sorbent made MgO species more reactive for the carbonation, bringing about a mark-edly enhanced kinetic rate and conversion, as compared with the unpromoted MgCO3/Al2O3 sorbent having a smallnegligible reactivity. The addition of NaNO3 to MgCO3/Al2O3 or to Na2CO3-MgCO3/Al2O3 induced the same promo-tional effects, but to a lesser magnitude, as observed for the Na2CO3 addition. It was also characteristic for all theseMgCO3-based sorbents that initial carbonation conversions with time appeared as sigmoid curves. For the Al2O3-sup-ported sorbent comprised of NaNO3, Na2CO3, and MgCO3 by 0.6, 1.8, and 1.2mmols, respectively, per gram sorbent,showing the best kinetic performance, a kinetic equation capable of reflecting such sigmoid conversion behavior wasestablished, and its applicability to a riser carbonator was examined throughout a simple model calculation based onthe kinetics obtained.
박용기,서휘민,최원춘,강나영,박선영,민다영,김혜미,김대진,김기웅,이광순,조형희 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
화력 발전소의 배 가스에서 이산화탄소를 선택적으로 제거할 수 있는 다양한 기술중 본 연구는 고체 흡수제를 이용한 CO2 포집 공정 개발을 목표로 한다. 고체 흡수 제를 이용한 건식 CO2 포집 공정은 기존의 MEA (Monoethanolamine) 습식법에 비해 낮은 고체 비열, 부식성, 그리고 재비기에서 잠열에 소모되는 에너지를 절감할 수 있다는 측면에서 에너지 절감형 CO2 포집 공정이다. 건식 CO2 포집 공정을 개발하기 위해 다단 유동층을 이용한 CO2 포집 공정을 대상으로 한다. 저온/중온/고온부에서 3 종류의 흡수제를 이용해 CO2를 회수하며 이 때 고온/중온부의 흡수 에너지를 중온/저온부의 재생 에너지로 각각 이용한다. 흡수/재생 반응기는 고속 유동층을 이용하였고, 작동 온도 별 흡수제로는 저온-아민 담지 실리카, 중온-MgO계 double salt, 고온-Li4SiO4을 개발 대상으로 한다. 본 연구에서는 현재개발 중인 저온/중온/고온 흡수제의 연구 상황과 함께 성능을 비교/분석하고, 다단 CO2 포집 장치의 공정 개념 및 벤치 규모 공정 장치를 이용한 Cold/Hot bed 테스트 결과 및 CO2 포집 성능을 분석한다. 마지막으로 공정의 경제성 분석 및 이를 근거로 한 향후 연구 개발 방향에 대해 논의한다.
Energy exchangeable multi-stage dry sorbent CO<sub>2</sub> capture process
박용기,서휘민,최원춘,강나영,박선영,민다영,김혜미 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
A dry sorbent CO<sub>2</sub> capture process was designed to reduce the thermal energy consumption. The process utilize heat of absorption for heat of regeneration by consisting 3 stage process, and it can reduce the total thermal energy demand of a single stage capture process by more than 50%. The concept was realized as a lab-scale facility that can deal with CO<sub>2</sub> containing gas mixture with a flow rate of 60N㎥/h. The facility was designed so as to make inter-stage heat exchange and intra-stage heat exchange possible, and to measure the heat exchange rate accurately. The process needs 3 kinds of sorbents that work at the 3 different temperature stages. Three spherical sorbents suitable for fluidized beds have been developed. Development results of the facility and the sorbents for the energy exchangeable dry sorbent CO<sub>2</sub> capture process will be presented, and the operation results of the 60N㎥/h facility will also be disclosed.
Synthesis of p-phenylenediamine (PPD) from p-Diiodobenezene using Copper(1) catalyst
이상용,김정석,서휘민,강나영,박선영,최원춘,박용기,구기갑 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
Aramid fiber is well known to have excellent physical properties such as high thermal resistance and durability. In this work, for the production of p-Phenylenediamine(PPD), which is used as a precursor of para aramid fiber, the reaction of p-Diiodobenzene (PDIB) with a copper iodide catalyst was investigated. In general, as an amine donor for the copper-catalyzed amination of aryl halide, ammonia surrogates are used and results in additional process cost. However, in the present work, to avoid an unnecessary process and the production of undesirable compounds, ammonia was directly applied and found to work successfully. For the improvement of the reactivity, the reduction of the copper catalyst was achieved by using ascorbic acid and dihydroxyfumaric acid.
초중질유분 고도화를 위한 슬러리 수첨분해 공정에서의 분산촉매 분산 거동 연구
김성호,김규태,서휘민,박선영,강기혁,서필원,( Nguyen Manh Tung ),( Nguyen Ngoc Thuy ) 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
오랫동안 석유분야에서는 감압잔사유 처리가 중요한 화두였다. 현재 중질유 촉매 처리공정은 고정층, 유도층, 슬러리 반응 공정이 대표적이다. 특히, 슬러리 반응기에 적용되는 촉매는 나노 스캐일에 고도로 분산된 촉매로 반응물 내 거동이 정확히 알려져 있지 않다. 그에 따라, 감압잔사유 내에서 분산촉매의 전구체가 촉매로 전환되는 과정과 분산 거동을 연구하였다. 본 연구에서는 분산촉매를 감압잔사유나 아스팔텐에 분산시켜 반응 전과 반응 중 거동을 XRD, SAXS, XPS, Turbiscan을 통하여 분산 형태를 관찰하였고, 이를 통해 분산촉매의 분산거동과 변화과정을 확인하였다.
김기웅,박준형,정은지,이광순,서휘민,박용기 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
As a future post-combustion CCS technology, the solid sorbent-based process is extensively researched recently because lower energy penalty is expected thereof compared to that of the conventional amine scrubbing process. The type of gas-solid contactor of solid sorbent-based process has considerable impact on overall performance but systematic comparison of the different designs has not been reported yet. In this work, various sorption systems with different gas-solid contact types including i) moving-, ii) bubbling-, and iii) fast fluidized-bed using an amine supported adsorbent are numerically investigated using first principle mathematical models, and their behaviours and performance are compared. From the results, future research directions are discussed from the view point of process design to improve the economic feasibility of solid sorbent-based carbon capture processes.
A review on the Mo-precursors for catalytic hydroconversion of heavy oil
강기혁,김규태,박선영,서필원,서휘민,이철위 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.76 No.-
MoS2 is known as core material for the hydroconversion of heavy oil in petroleum refinery due to itssuperior coke suppression and desulfurization activities. With the recent interest in applying MoS2 toslurry-bed reactors, it has become important to design appropriate Mo-precursors and to identify factorsfor evaluating them. In this review, various methods for the synthesis of MoS2 from Mo-precursors andtheir physicochemical properties were examined. It was revealed that several properties of Moprecursors(dispersibility and thermal properties) and MoS2 (sulfidation degree, particle size, andstacking) serve as crucial factors in determining catalytic performance. For better catalyst design, thedecomposition pathway of Mo-precursors and the effect of carbonaceous material on MoS2 were alsodiscussed.