• 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.

• The Monthly Diabetes
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• s.173
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• pp.16-21
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• 2004

• Proceedings of the Korean Fiber Society Conference
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• 1999.10a
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• pp.227-230
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• 1999

• 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.

• The Journal of Korean Academy of Prosthodontics
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• v.56 no.2
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• pp.120-125
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• 2018

Conventional denture impression techniques have limitations for edentulous patients with severe alveolar bone resorption and can cause problems from excessive border extension. Especially when a patient has movable tissue it is difficult to make accurate impression, thus might interrupt stable seating of complete denture. Fabrication of complete denture using closed mouth technique for edentulous patient with severe ridge resorption is thought to provide better stability and retention. In this case, an 86-year-old patient had both edentulous jaws with epulis fissuratum on maxillary anterior ridge and severe mandibular ridge resorption. Thus, tentative vertical dimension was determined by using Centric trayand individual tray attached with gothic arch tracer was fabricated. Complete denture was fabricated using closed mouth technique and the patient was satisfied with better stability and retention of the complete denture.

• 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.

• Plant Journal
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• v.8 no.4
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• pp.40-44
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• 2012

The pre-treatment of natural gas to remove $H_2S$ and $CO_2$ before liquefaction in natural gas processing is required, and amine-based absorption processes are widely used in gas processing. The current study aims to model amine-based absorption process and to find cost-effective design through systematic analysis of energy systems, together with column design. Different design options for absorber and stripper are investigated in a holistic manner, and heat integration technique has been applied to investigate how design of columns is interacted with energy efficiency for the pre-treatment process considered. Case study has been presented to demonstrate the applicability of heat integration method for improving energy efficiency in practice.

• Applied Chemistry for Engineering
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• v.23 no.6
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• pp.624-629
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• 2012

To capture and recover carbon dioxide ($CO_2$), we impregnated honeycomb made of ceramic paper with $K_2CO_3$ and its absorption characteristics of $CO_2$ were investigated. The absorption amount of $CO_2$ on the honeycomb absorbent impregnated with $K_2CO_3$ was 13.8 wt% at a constant temperature ($70^{\circ}C$) and relative humidity (66%) condition. Because the absorption amount of $CO_2$ achieved almost the same loading ratio of $K_2CO_3$ (17.6 wt%), the absorption reaction of $CO_2$ by $K_2CO_3$ on the honeycomb absorbent seems to be going smoothly. In addition, $CO_2$ absorption breakthrough characteristics of the honeycomb absorbent were analyzed at the temperature range of $50{\sim}80^{\circ}C$, and the water vapor was fed to an absorption column before the feeding of $CO_2$ or simultaneously with $CO_2$. As a result, the absorption capacity of $CO_2$ was more enhanced using the water vapor supplying before $CO_2$ than that of simultaneous supplying. It was confirmed by temperature programmed desorption analysis that the $KHCO_3$ produced by the absorption reaction of $K_2CO_3$ and $CO_2$ is regenerated by the desorption of $CO_2$ at a temperature of about $128^{\circ}C$.

• The Bimonthly Magazine for Agrochemicals and Plant Protection
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• v.10 no.6 s.93
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• pp.25-31
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• 1989

제초제의 해독제란 제초제 약해로부터 작물을 선택적으로 보호하는 화합물을 의미한다. 현재 사용되고 있는 제초제 해독제는 작물에 흡수, 이행되는 제초제의 양을 줄여주거나 작물체내에서 제초제의 대사작용 속도를 촉진하여 무독성화 시킴으로써 작물의 약해를 경감시킨다.

• Applied Chemistry for Engineering
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• v.27 no.4
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• pp.391-396
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• 2016

The absorption efficiency of amine $CO_2$ absorbent (KoSol-5) developed by KEPCO research institute was evaluated using a 0.1 MW test bed. The performance of post-combustion technology to capture two tons of $CO_2$ per day from a slipstream of the flue gas from a 500 MW coal-fired power station was first confirmed in Korea. Also the analysis of the absorbent regeneration energy was conducted to suggest the reliable data for the KoSol-5 absorbent performance. And we tested energy reduction effects by improving the absorption tower inter-cooling system. Overall results showed that the $CO_2$ removal rate met the technical guideline ($CO_2$ removal rate : 90%) suggested by IEA-GHG. Also the regeneration energy of the KoSol-5 showed about $3.05GJ/tonCO_2$ which was about 25% reduction in the regeneration energy compared to that of using the commercial absorbent MEA (Monoethanolamine). Based on current experiments, the KoSol-5 absorbent showed high efficiency for $CO_2$ capture. It is expected that the application of KoSol-5 to commercial scale $CO_2$ capture plants could dramatically reduce $CO_2$ capture costs.