• Title/Summary/Keyword: $CO_2$ Absorbent

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Low Concentration CO2 Absorption Performance of Aqueous Alkanolamine Solutions (알카놀아민 수용액을 이용한 저농도 CO2 흡수 특성)

  • Park, IL-Gun;Hong, Min-Sun;Kim, Beom-Seok;Kim, Heung-Lea
    • Journal of Korean Society of Environmental Engineers
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    • v.36 no.3
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    • pp.185-191
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    • 2014
  • In this paper, absorption and reaction characteristics of low $CO_2$ and alkanolamines were investigated. As MEA concentrations increase 1, 2 and 3 wt%, $CO_2$ loadings decrease 0.34 mol-$CO_2/mol$-absorbent, 0.32 mol-$CO_2/mol$-absorbent and 0.3 mol-$CO_2/mol$-absorbent, respectively. Also, $CO_2$ loadings decrease from 0.32 mol-$CO_2/mol$-absorbent, 0.30 mol-$CO_2/mol$-absorbent and 0.28 mol-$CO_2/mol$-absorbent as AMP concentrations increase 1, 2 and 3 wt%. Experimental results with blending solutions show that $CO_2$ loading was the highest, 0.52 mol-$CO_2/mol$-absorbent, when 0.5 wt% MEA and 0.5 wt% AMP were blended.

Degradation of Aqueous Monoethanolamine Absorbent (모노에탄올아민 흡수제의 열화특성 분석)

  • Cho, Youngmin;Nam, Sung-Chan;Yoon, Yeo-Il;Moon, Sungjun;Baek, Il Hyun
    • Applied Chemistry for Engineering
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    • v.21 no.2
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    • pp.195-199
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    • 2010
  • The reversible chemical absorption using MEA (monoethanolamine), one of alkanolamine, is generally used as a conventionally method for $CO_{2}$ capture. Even MEA absorbent has excellent reactivity with $CO_{2}$, it has been known to have the decrease of absorption capacity caused by $CO_{2}$, $O_{2}$ or other acid gases in flue gas, corrosion and thermal degradation. In this study, MEA solutions degraded in the steam reforming process of refinery used and the absorption performance were compared for the used of conventional MEA solution. In case of 30 wt% MEA and mixture of 20 wt% thermal degraded absorbent (DP) and 10 wt% PZ, the absorption capacities were $0.5365mol-CO_{2}$/mol-absorbent and $0.5939mol-CO_{2}$/mol-absorbent respectively. PZ added thermally degraded absorbent showed the enhanced absorption capacity. On the contrary, the absorption rates were $1.1610kg_{f}/cm^2{\cdot}min$ for 30 wt% MEA, $0.5310kg_{f}/cm^2{\cdot}min$ for mixture of 20 wt% thermal degraded absorbent (DP) and 10 wt% PZ and $0.3525kg_{f}/cm^2{\cdot}min$ for 30 wt% thermally degraded absorbent only. The absorption rates of PZ added thermally degraded absorbent was higher than that of thermally degraded absorbent only. Therefore, it can be confirmed that thermally degraded absorbent can be reused as an absorbent for $CO_{2}$ by the addition of suitable additives.

The Characteristics of Attrition of Absorbents for Pre-combustion CO2 Capture (연소 전 CO2 포집 흡수제들의 마모특성)

  • Ryu, Hojung;Lee, Dongho;Moon, Jongho;Park, Youngcheol;Jo, Sungho
    • Transactions of the Korean hydrogen and new energy society
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    • v.24 no.5
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    • pp.428-436
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    • 2013
  • Attrition characteristics of $CO_2$ absorbents for pre-combustion $CO_2$ capture were investigated to check attrition loss of those absorbents and to determine solid circulation direction and the better $CO_2$ absorbent. The cumulative attrition losses of two absorbents increased with increasing time. However, attrition loss under a humidified condition was lower than that under a non-humidified condition case. Between two absorbents, attrition loss of PKM1-SU absorbent was higher than that of P4-600 absorbent. The average particle sizes of the attrited particles were less than $2.5{\mu}m$ for two absorbents under a non-humidified condition case, and therefore, we could conclude that the main mechanism of attrition for two absorbents is not fragmentation but abrasion. Based on the results from the test for the effect of humidity on the attrition loss, we selected solid circulation direction from SEWGS reactor to regeneration reactor because the SEWGS reactor contains more water vapor than regeneration reactor. Attrition loss and make-up rate of two absorbents were compared based on the results from $CO_2$ sorption capacity tests and attrition tests. Required make-up rate of P4-600 absorbent was lower than that of PKM1-SU absorbent. However, more detail investigation on the optimum regeneration temperature, manufacturing cost, solid circulation rate, regeneration rate, and long-term sorption capacity should be considered to select the best $CO_2$ absorbent.

Effects of Operating Variables on Sorption Capacity of CO2 Absorbents for SEWGS Process (SEWGS 공정용 CO2 흡수제들의 흡수능력에 미치는 조업변수들의 영향)

  • Ryu, Ho-Jung;Kim, Hyo-Sung;Lee, Seung-Yong;Lee, Dong-Ho;Kim, Jae-Chang
    • Korean Chemical Engineering Research
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    • v.50 no.6
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    • pp.994-1001
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    • 2012
  • The Effects of operating variables on reactivity of two $CO_2$ absorbents (PKM1-SU and P4-600) for SEWGS process were investigated in a pressurized fluidized bed reactor. For both $CO_2$ absorbents, $CO_2$ sorption capacity decreased as the number of absorption-regeneration cycles increased. PKM1-SU absorbent represented higher $CO_2$ sorption capacity than that of P4-600 absorbent. However, P4-600 absorbent represented better performance than PKM1-SU absorbent from the view points of regeneration temperature and regeneration rate. For PKM1-SU absorbent, $CO_2$ sorption capacity increased as the steam concentration increased. However, $CO_2$ sorption capacity increased initially as the steam concentration increased from 5% to 10%, but maintained thereafter for P4-600 absorbent. For both $CO_2$ absorbents, $CO_2$ sorption capacity increased as the final regeneration temperature increased. For PKM1-SU absorbent, $CO_2$ sorption capacity increased as the pressure increased and the increment tendency was drastic at higher pressure than 15 bar.

Effects of Gas-absorbent on the Storage of Kimchi (김치 저장성에 미치는 가스 흡수제의 영향)

  • 윤경영;강미정;신승렬;윤광섭;김순동;김광수
    • Food Science and Preservation
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    • v.5 no.4
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    • pp.363-367
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    • 1998
  • Kimchi attached gas-absorbent and unattached one were stored at 20$^{\circ}C$, examined for the storage effects by measuring changes of pH, acidity, CO$_2$ contents, total microbe and lactic acid bacteria. pH of kimchi attached KOH is higher than that of the others during storage. Acidity of kimchi attached KOH is lower than that of the others during storage. The CO$_2$ contents of kimchi used KOH as Bas-absorbent is 1.5 mg% at 6 days, after it's value is constant during storage. And the CO$_2$ content of kimchi attached gas-absorbent is lower than that of kimchi unattached gas-absorbent. Total microbe number of kimchi unattached gas-absorbent, treated Ca(OH)$_2$ and treated KOH are the highest value at 6, 6 and 8 days, respectively. Lactic acid bacteria number of kimchi is increased during storage and that of kimchi attached gas-absorbent is higher than that of kimchi unattached gas-absorbent.

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Degradation Characteristics of Aqueous MEA Solution by Corrosion Products and Absorption Conditions (흡수 조건 및 부식 생성물에 의한 MEA 수용액의 변성 특성)

  • NAM, SUNGCHAN;SONG, YOONAH;BAEK, ILHYUN;YOON, YEOIL;YOU, JEONGKYUN;LEE, CHANGHA
    • Transactions of the Korean hydrogen and new energy society
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    • v.27 no.3
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    • pp.290-297
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    • 2016
  • The absorbent loss due to degradation in $CO_2$ capture process using aqueous alkanol amine solution has adverse effect on the economics of overall process. The degradation causes absorbent loss, equipment corrosion, foaming, adhesive material producing and viscosity increase in operation. In this study, the degradation characteristics of $CO_2$ capture process using MEA (monoehtanolamine) under various conditions such as $O_2$ partial pressure, $CO_2$ loading and absorbent temperature. The effects of iron, which generated from the equipment corrosion, on absorbent degradation were studied using $Fe_2SO_4$ containing MEA solution. The produced gases were analyzed by FT-IR(Fourier Transform Infrared Spectrophotometer) and the specifically measured $NH_3$ concentration was used as a degradation degree of aqueous MEA solution. The experiments showed that the higher $CO_2$ loadings (${\alpha}$), $O_2$ fraction ($y_{O2}$) and reaction temperature enhanced the more degradation of aqueous MEA solution. Comparing other operation parameters, the reaction temperature most affected on the degradation. Therefore, it could be concluded that the above parameters affects on degradation should be considered for the selections of $CO_2$ absorbent and operating conditions.

Effect of Isopropanol on CO2 Absorption by Diethylenetriamine Aqueous Solutions (이소프로판올을 포함한 디에틸렌트리아민 상분리 흡수제의 CO2 흡수 특성)

  • Lee, Hwa Young;Seok, Chang Hwan;Hong, Yeon Ki
    • Clean Technology
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    • v.27 no.3
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    • pp.255-260
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    • 2021
  • A drawback in the CO2 capture process using an aqueous amine solution is the high energy requirement for the regeneration process. In order to overcome this disadvantage, this study investigated CO2 capture characteristics using a biphasic absorbent in which isopropanol (IPA) was introduced into an aqueous solution of diethylenetriamine (DETA). When the IPA composition exceeded 20 wt% in 20 wt% DETA aqueous solution, the absorbent phase was liquid-liquid separated into a CO2-rich phase and a CO2-lean phase because of the low solubility of the salt formed by the reaction of CO2 with DETA in isopropanol. When the isopropanol composition in the DETA aqueous solution increased, the phase volume ratio of the CO2-rich phase to the volume of the CO2-lean phase increased; and, accordingly, the CO2 in the CO2-rich phase was more concentrated. The results of absorbing CO2 in a packed tower using 20 wt% DETA + IPA + water absorbent confirmed that both the CO2 absorption capacity and the absorption rate were higher than that of the 20 wt% DETA aqueous solution. When a biphasic absorbent composed of DETA + IPA + water is applied to CO2 capture, it can be expected to concentrate CO2 because of phase separation and thereby reduce regeneration energy owing to volume reduction of the CO2-rich phase.

Substituent Effect in the Reaction of Carbon Dioxide with Amine-Based Absorbent (치환기 특성에 따른 아민흡수제와 CO2의 반응특성 평가)

  • Shim, Jae-Goo;Lee, Junghyun;Jung, Jin-Kyu;Kwak, No-Sang
    • KEPCO Journal on Electric Power and Energy
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    • v.6 no.3
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    • pp.297-303
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    • 2020
  • The reaction of carbon dioxide with the amine-based absorbents which have various substituents in the molecule was described. In the case of MEA which is a representative primary amine, the absorption reaction was proceeded very fast while the regeneration reaction was took place slowly due to the strong bond strength between the absorbent and carbon dioxide. The more substituents on N atom of the absorbent, the slower the absorption reaction between carbon dioxide and the absorbent, which in turn causes faster the regeneration rate from the reaction intermediate, carbamate.

Performance Analysis of Absorbent for Post-combustion CO2 Capture by Regeneration (연소 후 CO2 포집을 위한 흡수제의 재생반응에 의한 성능 해석)

  • KIL, TAEHYOUNG;LEE, DONGHO;JO, SUNGHO;YI, CHANGKEUN;PARK, YEONGSEONG;RYU, HOJUNG
    • Transactions of the Korean hydrogen and new energy society
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    • v.27 no.1
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    • pp.83-94
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    • 2016
  • Performance of absorbent for post-combustion $CO_2$ capture was measured and discussed. Fully saturated fresh absorbent (P2-15F) and absorbents sampled from absorption and regeneration reactor of continuous $CO_2$ capture process, P2-15A, P2-15R, respectively, were used as representative absorbents. Small scale fluidized bed reactor (0.05 m I.D., 0.8 m high) which can measure exhaust gas concentration and weight change simultaneously was used to analyze regeneration characteristics for those absorbents. Exhausted moles of $CO_2$ and $H_2O$ were measured with increasing temperature. $H_2O/CO$ ratio and working capacity were determined and discussed to confirm reason of reactivity decay after continuous operation. Moreover, possibility of side reaction was checked based on the $H_2O/CO_2$ mole ratio. Finally, suitable regeneration temperature range was confirmed based on the trend of working capacity with temperature.

Effect of Precipitation on Operation Range of the CO2 Capture Process using Ammonia Water Absorbent (암모니아수 흡수제를 이용한 이산화탄소 제거 공정에서 침전생성이 조업영역에 미치는 영향)

  • You, Jong Kyun;Park, Ho Seok;Hong, Won Hi;Park, Jongkee;Kim, Jong-Nam
    • Korean Chemical Engineering Research
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    • v.45 no.3
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    • pp.258-263
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    • 2007
  • Ammonia water was investigated as a new absorbent of the chemical absorption process for the removal of $CO_2$ in flue gas. The suitable range of ammonia water concentration and $CO_2$ loading ($mol\;CO_2/mol\;NH_3$) were decided in the point of view of $CO_2$ absorption capacity and $NH_4HCO_3$ precipitation. The absorption capacity of $CO_2$ and the precipitation of $NH_4HCO_3$ in liquid phase were calculated by the Pitzer model for electrolyte solution. The $CO_2$ absorption capacity of the ammonia water over $5\;molNH_3/kgH_2O$ was higher than that of conventional amine absorbent. The $CO_2$ loadings where precipitation occurred were decided at various absorbent concentrations. Theses values were higher than 0.5 in the concentration range of $5-14\;molNH_3/kgH_2O$ at 293, 313 K. The absorber for the removal of $CO_2$ in flue gas could be operated without $NH_4HCO_3$ precipitation by using high concentration of ammonia water below these $CO_2$ loading values. The optimum temperature of the ammonia water absorbent for removal of $CO_2$ in flue gas was 297-312 K depending on the concentration of ammonia water.