• Title/Summary/Keyword: $CO_2$ 흡수 공정

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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.

$CO_2$ Capture Process using Aqueous Monoethanolamine (MEA): Reduction of Solvent Regeneration Energy by Flue gas Splitting (모노에탄올아민(MEA)을 이용한 이산화탄소 포집공정: 배가스 분할 유입을 통한 흡수제 재생 에너지 절감 연구)

  • Jung, Jaeheum;Lim, Youngsub;Jeong, Yeong Su;Lee, Ung;Yang, Seeyub;Han, Chonghun
    • Korean Chemical Engineering Research
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    • v.49 no.6
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    • pp.764-768
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    • 2011
  • The process of $CO_2$ capture using aqueous Monoethanolamine(MEA) has been considered as one of the leading technologies for intermediate-term strategy to reduce the $CO_2$ emission. This MEA process, however, consumes relatively a large amount of energy in the stripper for absorbent regeneration. For this reason, various process alternatives are recently established to reduce the regeneration energy. This paper suggests a flue gas split configuration as one of MEA process alternatives and then simulates this process using commercial simulator. This flue gas splitting has an effect on reducing the temperature of the lower section of absorber as well as decreasing the absorbent flow rate. Compared to the base model, this optimized flue gas split process provides 6.4% reduction of solvent flow rate and 5.8% reduction of absorbent regeneration energy.

Modeling of Solid Circulation in a Fluidized-Bed Dry Absorption and Regeneration System for CO2 Removal from Flue Gas (연소기체로부터 CO2 회수를 위한 건식 유동층 흡수-재생 공정의 고체순환 모사)

  • Choi, Jeong-Hoo;Park, Ji-Yong;Yi, Chang-Keun;Jo, Sung-Ho;Son, Jae-Ek;Ryu, Chong Kul;Kim, Sang-Done
    • Korean Chemical Engineering Research
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    • v.43 no.2
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    • pp.286-293
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    • 2005
  • An interpretation on the solid circulation characteristics in a fluidized-bed process has been carried out as a first step to simulate the dry entrained-bed absorption and bubbling-bed regeneration system for $CO_2$ removal from flue gas. A particle population balance has been developed to determine the solid flow rates and particle size distributions in the process. Effects of principal process parameters have been discussed in a laboratory scale process (absorption column: 25 mm i.d., 6 m in height; regeneration column: 0.1 m i.d., 1.2 m in height). The particle size distributions in absorption and regeneration columns were nearly the same. As gas velocity or static bed height in the absorption column increased, soild circulation rate and feed rate of fresh sorbent increased, however, mean particle diameter decreased in the absorption column. As cut diameter of the cyclone of the absorption column increased, solid circulation rate decreased, whereas feed rate of fresh sorbent and mean particle diameter in the absorption column increased. As attrition coefficient of sorbent particle increased, solid circulation rate and feed rate of fresh sorbent increased but mean particle diameter in the absorption column decreased.

Comparison of CO2 Removal Capabilities among Rectisol, SelexolTM, and Purisol Process for DME Synthesis and Separation Process (DME 합성 및 분리공정에서 CO2 제거를 위한 Rectisol 공정과 SelexolTM 및 Purisol 공정 사이의 성능비교)

  • Noh, Jaehyun;Park, Hoey Kyung;Kim, Dongsun;Cho, Jungho
    • Clean Technology
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    • v.23 no.3
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    • pp.237-247
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    • 2017
  • In the dimethyl ether (DME) synthesis and separation process, over 8% by mole of $CO_2$ is fed to the DME synthesis reactor which lowers DME productivity. Therefore, this work focused on the removal of $CO_2$ using three kinds of processes with physical absorbents by comparing the utility consumption through computer simulation of each process. Among the processes selected for comparison are Rectisol$^{(R)}$ process using methanol, Purisol$^{(R)}$ process using n-methyl pyrrolidone (NMP), and SelexolTM process using dimethyl ethers of polyethylene glycol (DEPG) as a solvent. As a result of this study, it was concluded that Purisol$^{(R)}$ process consumes the least energy followed by SelexolTM process. Therefore, it is considered that Purisol$^{(R)}$ process is the most suitable method to absorb $CO_2$ contained in the feed of DME synthesis reactor.

Effect of Carbonic Anhydrase on CO2 Absorption in Amine Solutions for CO2 Capture (CO2 포집용 아민 흡수제에서 탄산무수화 효소가 CO2 흡수에 미치는 영향)

  • Lee, In-Young;Kwak, No-Sang
    • Journal of Korean Society of Environmental Engineers
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    • v.39 no.11
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    • pp.607-612
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    • 2017
  • The effect of carbonic anhydrase on $CO_2$ absorption rates and the heat of reaction were evaluated in various amine solutions for post combustion $CO_2$ capture process. The $CO_2$ absorption rate was analyzed in 30 wt% MEA, AMP, DMEA, MDEA aqueous solutions with and without carbonic anhydrase (250 mg/L) from bovine erythrocyte. $CO_2$ absorption rates were increased in all solutions with carbonic anhydrase. The effect of carbonic anhydrase on absorption rates was more in tertiary amine (DMEA and MDEA) solutions than in primary amine (MEA) and hindered amine (AMP) solutions. The heat of reaction of MEA, DMEA, MDEA aqueous solutions with and without carbonic anhydrase were measured using reaction calorimeter. Carbonic anhydrase decreased the heat of absorption in all solutions. The results suggested that tertiary amines that have the excellent desorption ability were suitable for applying carbonic anhydrase to the post combustion $CO_2$ capture process and the effect of carbonic anhydrase was best in MDEA solution.

Simulation on CO2 capture process using an Aqueous MEA solution (MEA 흡수제를 이용한 이산화탄소 포집 공정 모사)

  • Woo, Dae-Sik;Nam, Sung-Chan;Jeong, Soon-Kwan;Yoon, Yeo-Il
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.13 no.1
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    • pp.431-438
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    • 2012
  • The $CO_2$ capture technology using an aqueous amine solution is studied widely now. The entire process consists of an absorber to remove carbon dioxide selectively and a regenerator to regenerate absorbent and acquire pure carbon dioxide. Because there are the complicated design variables that affect performance of the process, it needs optimization and analysis through modeling to make a commercially reliable process. In this study, the decomposition method was proposed to consider convergence problem and sensitivity analysis was executed for the carbon dioxide capture process variables. Non-equilibrium model was used in the simulation to get more realistic results and we designed optimized process with more than 95% purity and 90% recovery.

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.

Absorption Characteristics of Aqueous Sodium Glycinate Solution with Carbon Dioxide and Its Mechanistic Analysis (Sodium Glycinate 수용액의 CO$_2$ 흡수특성 및 반응 메커니즘 해석)

  • Shim, Jae-Goo;Kim, Jun-Han;Jang, Kyung-Ryong
    • Journal of Korean Society of Environmental Engineers
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    • v.30 no.4
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    • pp.430-438
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    • 2008
  • The experiments for separation and recovery of CO$_2$ were conducted by aqueous sodium glycinate solution, which is one of the amino acid salts, as an absorbent of CO$_2$ in this study. Absorption capacities of aqueous MEA and sodium glycinate solution according to partial pressure of CO$_2$ were evaluated by vapor-liquid equilibrium tests of 20 wt% and 30 wt% above-mentioned absorbents, respectively. In addition, the pilot scale(2 t-CO$_2$/day) experiments based on prior results were carried out. As a result, CO$_2$ removal efficiency of aqueous sodium glycinate solution was lower than that of aqueous MEA solution. This phenomenon means that CO$_2$ removal efficiency of aqueous sodium glycinate solution mainly depends on its molecular structure. Consequently, the first application of certain amino acid salt, as an absorbent of CO$_2$, to pilot plant of 2 t-CO$_2$/day scale was carried out in our country.

Characterization of Glycine Metal Salts for $CO_2$ Absorption (이산화탄소 흡수를 위한 글리신 금속염의 특성 연구)

  • Lim, Yun-Hui;Park, Young Koo;Jo, Young-Min
    • Applied Chemistry for Engineering
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    • v.23 no.3
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    • pp.284-288
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    • 2012
  • This work deals with the chemical characterization of glycine aqueous solution in $CO_2$ absorption. Three alkali elements were impregnated into the glycine in order to facilitate the formation of amino functionalities. The analysis by IR revealed the transformation of ammonium ions to the amino group. In addition, the NMR analysis showed that the substitution of metal cations to the chemical shift of hydrogen and carbon atoms in glycine; in order of lithium glycinate, sodium glycinate and potassium glycinate depending on the electro negativity. Meanwhile, the $CO_2$ absorption at room temperature was the highest in primary amine solution, but at the increasing temperature sodium glycinate could capture more $CO_2$ than that of the pure amine solution.

Deactivation causes of dry sorbents for post-combustion CO2 capture (연소 후 이산화탄소 포집용 흡수제의 비활성화 원인 규명)

  • Cho, Min Sun;Chae, Ho Jin;Lee, Soo Chool;Jo, Seong Bin;Kim, Tae young;Lee, Chul Ho;Baek, Jeom-In;Kim, Jae Chang
    • Korean Chemical Engineering Research
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    • v.57 no.2
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    • pp.253-258
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    • 2019
  • Several materials are used to design the sorbents applied in a fast-fluidized bed process for post-combustion $CO_2$ capture. In this study, $K_2CO_3$-based dry sorbent (KMC) was prepared by using Micro-cell C (MCC), one of the materials used to design the sorbent, and then its $CO_2$ sorption and regeneration properties were evaluated. KMC sorbent showed a low $CO_2$ capture capacity of 21.6 mg $CO_2/g$ sorbent, which is about 22% of the theoretical value (95.4 mg $CO_2/g$ sorbent) even at 1 cycle, and showed a low $CO_2$ capture capacity of 13.7 mg $CO_2/g$ sorbent at 5 cycles. It was confirmed that the KMC sorbent was deactivated due to the formation of a $K_2Ca$ $(CO_3)_2$ phase, resulting from the reaction of the $K_2CO_3$ with the Ca component contained in the MCC. In order to solve the deactivation of sorbent, and KM8 sorbent was prepared by adding the process of calcining the MCC at $850^{\circ}C$. The KM8 sorbent showed a high $CO_2$ capture capacity of 95.2 mg $CO_2/g$ sorbent and excellent regeneration property. Thus, it was confirmed that the deactivation of the sorbent could be solved by adding the calcining step to remove the side reaction causing material.