Study of single process for CO2 capture and mineralization

( Murnandari Arti ),윤민혜,정순관 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0

Climate change, especially global warming, has accelerated due to the growing concentration of carbon dioxide in the atmosphere. Among the various approaches aimed at reducing the emission of carbon dioxide, Carbon Capture and Storage (CCS) technology is becoming increasingly important. In this work, CO2 mineralization reaction was carried out for the sequestration of absorbed CO2 in aqueous AMP (solution2-amino-2-methyl-1-propanol) instead of thermal regeneration method. All reactions for CO2 mineralization were conducted by semi-batch reactor with different injection of calcium source. The effect of process parameters such as temperature, mixing rate, and reaction time, and calcium source variation on the shape and crystal structure of produced CaCO3 was investigated.

이산화탄소 흡수-광물화 단일반응을 통한 탄산칼슘 제조 연구

( Murnandari Arti ),윤민혜,정순관 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0

지구온난화에 따른 기후변화 대응기술로서 CCS가 주목받고 있는 가운데 보다 효과적인 이산화탄소 포집 및 저장방법에 대한 연구가 주목을 받고 있다. 본 연구에서는 이산화탄소를 포집하는 동시에 유용한 광물자원으로 전환하고자 AMP (2-Amino-2-Methyl-1-Propanol) 용액에 이산화탄소를 포화시킨 후, 다양한 칼슘이온 전구체와 반응하여 탄산칼슘을 제조하였고, 이에 따른 탄산칼슘의 특성을 분석하였다. 일반적으로 탄산칼슘은 가장 안정한 calcite와 vaterite 및 aragonite의 3가지 상으로 존재하는데 본 연구에서는 여러 공정 변수로부터 생성된 탄산칼슘의 결정상을 조절할 수 있었고, 흡수와 광물화 반응을 동시에 진행하여 CCS의 효율을 높일 수 있었다. 사용하는 칼슘 전구체의 종류와 Supersaturation 조건 및 온도 등이 이산화탄소 광물화 반응에 공정변수로 작용하였으며, XRD, SEM, BET 등의 특성분석을 통하여 이들 변수가 탄산칼슘의 특성에 미치는 영향을 확인하였다.

Single Process Absorption and Mineralization for Carbon Capture Storage and Utilization

( Murnandari Arti ),윤민혜,정순관,강지민 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1

Amine scrubbing process has been used as a method to produce sweet gas in oil and gas industry. In regeneration, amine releases CO₂ at high temperature in stripper column to be stored or utilized. Such process require high energy amount. In a single process of absorption and mineralization, desorption of CO₂ from saturated amine liquid is done by converting it into calcium carbonate. Converting CO₂ into calcium carbonate in the single process can be done by reacting bicarbonate ions with the calcium source. In this study bicarbonate and carbonate ions captured in the amine liquid is reacted with calcium chloride. Process parameter such as reactant ratio, temperature, mixing rate, and additive presence in the system become main attention in this study. Evaluating the process can be done by comparing the process yield and working capacity of the solvent. Effect of amine and calcium source variation on the calcium carbonate crystal also investigated.

Precipitation control of calcium carbonate crystal polymorph as sequestration of co2 chemical absorption in amine

( Murnandari Arti ),이지연,윤민혜,정순관 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0

Technology existed for gas sweetening process is chemical absorption of CO2 using amine. Included in this process is regeneration of amine by heat. Regeneration process increase 70-100% cost of electricity mainly because of its heating duty. By this mean, mineralization as alternative to utilize and store the CO2 after absorption is proposed. Mineralization converts CO2 into stable mineral such as calcium carbonate, this process can be done through chemical precipitation. However, precipitation must be controlled to produce calcium carbonate with high yield. In this work, feed rate, calcium source, mixing rate, and temperature are varied to get the optimum parameter of precipitation. Crystal morphology is investigated as effect of each parameter used.

Single Process for CO₂ Capture and Mineralization in Various Alkanolamines Using Calcium Chloride

Arti, Murnandari,Youn, Min Hye,Park, Ki Tae,Kim, Hak Joo,Kim, Young Eun,Jeong, Soon Kwan American Chemical Society 2017 ENERGY AND FUELS Vol.31 No.1

<P>To replace the thermal regeneration method of absorbent in the CO2 capture system, a novel method of CO2 absorption mineralization was investigated. In this study,. various alkanolamine absorbents, such as monoethanolarnine.(MEA), diethanolamine (DEA), N-methyldiethanolamine (MDEA), and 2--amino-2-methyl-1-propanol (AMP), were applied to the CO, absorption regeneration process with different-regeneration methods via thermal treatment and Mineralization. Calcium chloride was added as a calcium source in the mineralization process. Integration of absorption and mineralization defined as a single process was proposed in this study to resolve the excessive requirement of energy in a conventional amine regeneration process, leading to enhanced working capacity and desorption rate without increasing the regeneration temperature. This method provides an increment of working capacity 1.3-3 times higher than the conventional thermal amine-scrubbing process. Among the tested amines, MEA exhibited the highest increase of working capacity and AMP showed the highest yield of CaCO3 MEA, DEA, and MDEA favored the formation of calcite, while AMP produced a mixture of calcite and vaterite.</P>

Effect of process parameters on the CaCO3 production in the single process for carbon capture and mineralization

Arti Murnandari,강지민,윤민혜,박기태,김학주,강성필,정순관 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.3

The regeneration of the CO2 capture system is the most energy-intensive process associated with CO2 capture because high temperatures are required to desorb CO2 from the absorbent. We propose a single process for effective CO2 capture and mineralization as a substitute for desorption of absorbed CO2, producing high value-added CaCO3. A saturated 2-amino-2-methyl-1-propanol (AMP) solution was used as a carbonate source, and calcium chloride (CaCl2) was used as a calcium ion source to precipitate CaCO3. A semi-batch reactor was used to investigate the effects of the mixing rate, temperature, and amount of calcium added during the CaCO3 precipitation process. During the mineralization reaction, the absorbed CO2 in AMP solution instantly converted into white CaCO3 precipitant with 97.4% conversion. The stirring rate provided a reciprocal effect on the crystal size, whereas the temperature and Ca/ CO2 molar ratio appeared to affect the crystal morphology.

NaOH 수용액 상에서 공정변수가 탄산칼슘 생성에 미치는 영향

강지민,( Arti Murnandari ),윤민혜,정순관 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1

CO₂가 환경오염의 주원인으로 대두되면서 CO₂ 포집 및 저장, 활용에 대한 연구가 많이 진행되고 있다. CO₂를 Ca 양이온과 결합시켜 고부가화 된 CaCO₃는 산업용 콘크리트, 페인트나 고무 등의 충진제, 제지 및 플라스틱 산업에서 널리 이용되고 있다. CaCO₃는 calcite, aragonite, vaterite로 크게 3종류의 결정구조를 갖는다. 본 연구에서는 NaOH 수용액을 이용하여 CO₂를 흡수 및 포집한 후, Ca 양이온을 첨가하여 CaCO₃로의 결정화 반응에 적용하였다. 특히 Reaction temperature, Mixing rate, Ca/CO₂ ratio등의 공정변수가 CaCO₃ 결정구조에 미치는 영향을 SEM, XRD 등의 분석을 통해 규명하고자 하였다.

Formation of CaCO3 from calcium sources with different anions in single process of CO2 capture-mineralization

문대현,Arti Murnandari,Omotayo Salawu,이찬우,이원희,김영은,박기태,이지은,Jun Eo,정순관,윤민혜 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.10

The single process CO2 capture-mineralization approach integrates methods of CO2 absorption using aqueous solvents and mineral carbonation technology to not only remove carbon dioxide quickly, but also to simultaneously produce precipitated calcium carbonate (PCC). To develop a more sustainable process, it is important to extract calcium from inexpensive raw materials such as industrial by-products. The extractant has a significant effect on the quality of the calcium carbonate produced because it determines the anion paired with the calcium cation. In this work, several calcium sources with different anions (Propionate, Acetate, Nitrate and Chloride) were applied in the single process CO2 capture-mineralization method, and their influence on the polymorph of the obtained CaCO3 was investigated. The CaCO3 produced with inorganic calcium sources predominantly exhibited a calcite structure, while the CaCO3 produced with organic calcium sources had a structure in which vaterite and calcite coexist. This result was in good agreement with our DFT calculations, which indicated the adsorption energy of the organic anions (Propionate and Acetate) were lower than the inorganic anions on the surface of vaterite. Except for chloride with its non-polar nature, in most cases, there was a strong correlation between the polymorph and the adsorption energy calculated for each surface. A mechanism for the polymorph CaCO3 formation in our single process CO2 capture-mineralization method was proposed after observing crystal formation at low concentration.

Energy-efficient chemical regeneration of AMP using calcium hydroxide for operating carbon dioxide capture process

Kang, Ji Min,Murnandari, Arti,Youn, Min Hye,Lee, Wonhee,Park, Ki Tae,Kim, Young Eun,Kim, Hak Joo,Kang, Seong-Pil,Lee, Jung-Hyun,Jeong, Soon Kwan Elsevier 2018 Chemical engineering journal Vol.335 No.-

<P><B>Abstract</B></P> <P>To avoid the main disadvantage of the carbon dioxide (CO<SUB>2</SUB>) capture process, namely the large amount of energy consumed to regenerate the amine absorbent using current thermal methods, chemical regeneration has been introduced as a novel method to regenerate the amine. Chemical regeneration deploys a swing in the pH of the amine absorbent rather than the swing in temperature of typical thermal regeneration procedures, and hence reduces the regeneration energy. Here we tested calcium chloride (CaCl<SUB>2</SUB>) and calcium hydroxide (Ca(OH)<SUB>2</SUB>) as a calcium source for CO<SUB>2</SUB> desorption and a pH swing agent for amine regeneration. After desorbing from the amine, CO<SUB>2</SUB> in our procedures reacted with Ca<SUP>2+</SUP> to form calcium carbonate (CaCO<SUB>3</SUB>). Forming precipitated CaCO<SUB>3</SUB> is a permanent way to sequester CO<SUB>2</SUB>. Since carbonates have a low energy level compared to CO<SUB>2</SUB>, we expect the developed method to be an economical and energy-efficient process.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A novel process which is chemical regeneration through a pH swing is proposed. </LI> <LI> The chemical regeneration shows higher efficiency of CO<SUB>2</SUB> desorption than the thermal regeneration at even room temperature. </LI> <LI> After the chemical regeneration, a value-added CaCO<SUB>3</SUB> is produced. </LI> <LI> Ca(OH)<SUB>2</SUB> in the presence of Cl<SUP>−</SUP> plays a key role in desorbing CO<SUB>2</SUB> from amine and converting it into CaCO<SUB>3</SUB>. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Enhanced CO2 absorption and desorption in a tertiary amine medium with a carbonic anhydrase mimic

Dharmalingam Sivanesan,윤민혜,Arti Murnandari,강지민,박기태,김학주,정순관 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.52 No.-

We report the effects of a series of carbonic anhydrase (CA) model complexes on CO2 absorption anddesorption in an aqueous tertiary amine medium. The CO2 hydration efficiency was determined underbasic conditions by using stopped-flow kinetics experiments. Catalyst 6 was found to exhibit the best CO2hydration efficiency (3.130 103M 1 s 1) in the tertiary amine medium. In a highly concentrated tertiaryamine medium, catalyst 2 was found to enhance the absorption and regeneration efficiency of CO2 by 10%and 24%, respectively. Our results for simple CA model complexes indicate that possible usage ofsynthesized complexes in post-combustion process.