제올라이트 13X에 의한 배가스 성분의 흡착 특성 및 불순물의 영향

서성섭 ( Sung-sup Suh ),이호진 ( Ho-jin Lee ) 한국화학공학회 2016 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.54 No.6

Most of combustion processess used in industries require recovering or removing flue gas components. Recently a new MBA (moving bed adsorption) process for recovering CO₂ using zeolite 13X was developed. In this study, adsorption experiments for carbon dioxide, nitrogen, sulfur dioxide, and water vapor on zeolite 13X were carried out. Adsorption equilibrium and adsorption rate into solid particle were investigated. Langmuir, Toth, and Freundlich isotherm parameters were calculated from the experiment data at various temperatures. Experimental results were con-sistent with the theoretically predicted values. Also CO₂ adsorption amount was measured under the conditions with impurities such as SO₂ and H₂O. Binary adsorption data were well fitted to the extended Langmuir isotherm using parameters obtained from pure component experiment. However, H₂O impurity less than, roughly, ~10^-5 H₂O mol/g zeo-lite 13X enhanced slightly CO₂ adsorption. Spherical particle diffusion model well described experimentally measured adsorption rate. Diffusion coefficients and activation energies of CO₂, SO₂, N₂, H₂O were obtained. Diffusion coeffi-cients of CO₂ and SO₂ decreased with small amount of preadsorbed impurity. Parameter values from this study will be helpful to design of real commercial adsorption process.

흡착식 냉동기의 열 및 물질전달에 관한 실험적 연구

권오경,윤재호,주영주,김용찬,김종하 대한설비공학회 2005 설비공학 논문집 Vol.17 No.8

Adsorption chillers have been receiving considerable attentions as they are energy-saving and environmentally benign systems. In order to evaluate adsorption rates, experiments were performed in the batch type adsorption apparatus. Three types of silica gels were investigated under an assortment of experimental conditions that are representatives of the actual operating environments in the adsorber of adsorption chillers. Experimental results revealed the effects of silica gel particle size, bed temperature, and fin pitch of fin tube on the adsorption rate. The 0.25~1.18mm particle size of silica gel with high adsorption rate was selected as a suitable adsorbent. The measured adsorption rate became bigger with decreasing particle size. From the comparison of adsorption rate, it is found that the fin tube has about 21% higher value than that of the bare tube. The effect of heat and mass flux is found to be more significant in the fin tube than in the bare tube.

핀튜브형 흡착탑에서 열 및 물질전달 수치해석

권오경(Oh Kyung Kwon),정재동(Jae Dong Chung) 대한설비공학회 2013 설비공학 논문집 Vol.25 No.8

Nowadays, adsorption chillers have been receiving considerable attention, as they are energy saving and environmentally benign systems. A fin tube type heat exchanger in which adsorption/desorption takes place is required with more compact size. The adsorption chiller is expected to have high energy efficiency in utilizing the waste heat exhausted from a process. The objectives of this paper are to scrutinize the effect of design parameters on the adsorption performance, especially the fin pitch of the fin tube, and to develop an optimal design fin tube heat exchanger in a silica gel/water adsorption chiller. From the numerical results, the fin pitch of 2.5 mm shows the highest adsorption rate, compared to other fin pitches, such as 5 mm, 7.5 mm and 10mm. Also, the adsorption rate is affected by the cooling water and hot water temperature.

Hydrodynamic effects on the overall adsorption rate of phenol on activated carbon cloth through the advection-diffusion model application

E. García-Hernández,C.G. Aguilar-Madera,E.C. Herrera-Hernández,R. Ocampo-Pérez,E. Bailón-García,Farid B. Cortés 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.93 No.-

In this work, a mathematical formulation based on fundamental principles of momentum and masstransport with a kinetic adsorption model at the liquid-solid interface is proposed. This formulation wasnumerically solved and used for the interpretation of adsorption rate data of phenol onto an activatedcarbon cloth in a stirred tank adsorber under different agitation rates. The mathematical model solutionwas compared with the obtained by mathematical models that neglect the local velocity andconcentration profiles in the solution; external mass transfer model (EMTM) and thefirst-order kineticmodel (FOM). The results showed that under all studied stirring speeds (30 200 rpm) the proposedmodel was able to capture the dynamics of the concentration decay curves, while EMTM and FOM modelswere only able to interpret the data at high stirring speeds, indicating that velocity profiles play animportant role during phenol adsorption. Particular “wake zones” were identified behind the mobileadsorbent, which importantly promotes the transport of solute toward the activated carbon cloth. As aresult, it was found that convective transport is much more important than diffusive transport in thesolution.

Kinetics of Gas Adsorption on Strongly Heterogeneous Solid Surfaces : A Statistical Rate Theory Approach

Panczyk, Tomasz,Rudzinski, Wladyslaw 한국화학공학회 2004 Korean Journal of Chemical Engineering Vol.21 No.1

A fundamental theoretical investigation is carried out on the applicability of the Condensation Approximation (CA) method of generalization the theoretical description of the kinetics of gas adsorption/desorption on/from energetically heterogeneous solid surfaces. Our investigation implies that the commonly observed Elovich's behavior is a consequence of carrying out kinetic experiments at conditions not far from equilibrium. This striking results seems to suggest that the applicability of that popular approximately deserves further fundamental study.

Description of Cellobiohydrolases Ce16A and Ce17A from Trichoderma reesei Using Langmuir-type Models

Kim, Dong-Won,Hong, Young-Gwan The Korean Society for Biotechnology and Bioengine 2001 Biotechnology and Bioprocess Engineering Vol.6 No.2

The binding of cellobiohydrolases to cullulose is a crucial initial step in cellulose hydrolysis. In the search for a detailed understanding of the function of cellobiohydrolases, much information concerning how the enzymes and their constituent catalytic and cellulose-binding changes during hydrolysis is still needed. The adsorption of purified two cellobiohydrolases (Ce17A and Ce16A) from Trichoderma reesei cellulase to microcrystalline cellulose has been studied. Cellobiohydrolase II (Ce16A) does not affect the adsorption of cellobiohydrolase I (Ce17A) significantly, and there are specific binding sites for both Ce17A and Ce16A. The adsorption affinity and tightness of the cullulase binding domain (CBD) for Ce17A are larger than those of the CBD for Ce16A. The CBD for Ce17A binds more rapidly and tightly to Avicel than the CBD for Ce16A. The decrease in adsorption observed when the two cellobihydrolases are studied together would appear to be the result of competition for binding sites on the cellulose. Ce17A competes more efficiently for binding sites than Ce16A. Competition for binding sites is the dominating factor when the two enzymes are acting together, furthermore adsorption to sites specific for Ce17A and Ce16A, also contributes to the total adsorption.

하천고수부지 수질정화 자유수면인공습지의 초기운영단계 인제거

양홍모 ( Yang Hong Mo ) 한국환경농학회 2003 한국환경농학회지 Vol.22 No.4

Phosphorous removal rate and emergent plant growth were examined of a surface-flow constructed treatment wetland system, whose dimensions were 31 meter in length and 12 meter in width. The system was established on floodplain in the down reach of the Kwangju Stream in Korea in one and half months from May to June 2001. Cattails(Typha angustiflora) were transplanted in the system. They were dug out of natural wetlands and stems were cut at about 40 cm height from their bottom ends. Water of the Kwangju Stream were funneled into it via a pipe by gravity flow and its effluent were discharged back into it. The stems of cattails grew from 45.2 cm in July 2001 up to 186 cm in September 2001 and the number of cattail stems per square meter increased from 22 in July 2001 to 53 in September 2001. The early establishment of cattails was good. Volume and watersquality of inflow and oufflow were analyzed from July 2001 through December 2001. Mow averaged 40 ㎥/day and hydraulic retention time was about 1.5 days. The concentration of total phosphorous in influent and effluent was 0.85 ㎎/L, 0.41 ㎎/L, respectively. The average removal rate of total phosphorous in the system was about 52% The retention efficiency was slightly lower, compared with that in surface-flow wetlands operating in North America, whose retention efficiency was reported to be about 57% The lower abatement rate could result from the initial stage of the system and inclusion of two cold months into the six-month monitoring period. Root rhizosphere in wetland soils and l litter-soil layers on bottoms were not properly developed. Increase of standing density of cattails within a few years will establish both root zones and substrates beneficial to the removal of phosphorous, which may lead to increase of the phosphorous retention rate. The system was submerged one time by heavy storm during the monitoring period. The inundation, however, scarcely disturb its environment.

Kinetics of Gas Adsorption on Strongly Heterogeneous Solid Surfaces: A Statistical Rate Theory Approach

Wladyslaw Rudzinski,Tomasz Panczyk 한국화학공학회 2004 Korean Journal of Chemical Engineering Vol.21 No.1

A fundamental theoretical investigation is carried out on the applicability of the Condensation Approximation (CA) method of generalizing the theoretical description of the kinetics of gas adsorption/desorption on/from energetically heterogeneous solid surfaces. Our investigation implies that the commonly observed Elovich’s behavior is a consequence of carrying out kinetic experiments at conditions not far from equilibrium. This striking result seems to suggest that the applicability of that popular approximation deserves further fundamental study.

석류색소의 면섬유에 대한 염색성과 항균성

신윤숙,조은경 한국의류학회 2001 한국의류학회지 Vol.25 No.3

Dyeing properties of the colorants extracted from pomegranate hull on cotton fabric were investigated. Effects of dyeing conditions and mordanting on dye uptake, color change and colorfastness were explored. Cationic agent treatment was done for cotton to improve low dyeability in natural dyeing. In addition antimicrobial activity of the cotton fabrics dyed with pomegranate colorants was examined by the shake flask method. Pomegranate colorants showed low affinity to cotton fiber and its adsorption isotherm was Freundlich type. Therefore, hydrogen bonding was involved in the adsorption of pomegranate colorants onto cotton fiber. Mordants did not significantly increase dye adsorption. Pomegranate colorants produced mainly yellow color on cotton fabric. In order to improve dye uptake, cotton was cationized by treating with Cationon UK(quarterly ammonium salt) and chitosan. The cationized cotton with Cationon UK showed higher dye uptake and shorter dyeing time, compared with the untreated cotton. Chitosan treated cotton also showed high dye uptake, but chitosan was less effective compared with Cationon UK. Fastness to washing, perspiration, and rubbing was not improved by mordanting and cationizing treatment, but light fastness as increased by all mordants and cationic agent. As dye concentration increased, bacterial reduction rate was increased and mordants did not significantly increase bacterial reduction rate.

Silica-coated multi-walled carbon nanotubes impregnated with polyethyleneimine for carbon dioxide capture under the flue gas condition

Lee, Min-Sang,Park, Soo-Jin Elsevier 2015 Journal of solid state chemistry Vol.226 No.-

<P><B>Abstract</B></P> <P>In this study, silica-coated multi-walled carbon nanotubes impregnated with polyethyleneimine (PEI) were prepared via a two-step process: (i) hydrolysis of tetraethylorthosilicate onto multi-walled carbon nanotubes, and (ii) impregnation of PEI. The adsorption properties of CO<SUB>2</SUB> were investigated using CO<SUB>2</SUB> adsorption–desorption isotherms at 298K and thermogravimetric analysis under the flue gas condition (15% CO<SUB>2</SUB>/85% N<SUB>2</SUB>). The results obtained in this study indicate that CO<SUB>2</SUB> adsorption increases after impregnation of PEI. The increase in CO<SUB>2</SUB> capture was attributed to the affinity between CO<SUB>2</SUB> and the amine groups. CO<SUB>2</SUB> adsorption–desorption experiments, which were repeated five times, also showed that the prepared adsorbents have excellent regeneration properties.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Silica coated-MWCNT impregnated with PEI was synthesized. </LI> <LI> Amine groups of PEI gave CO<SUB>2</SUB> affinity sites on MWCNT surfaces. </LI> <LI> The S-MWCNT/PEI(50) exhibited the highest CO<SUB>2</SUB> adsorption capacity. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Fabrication and CO<SUB>2</SUB> adsorption process of the S-MWCNTs impregnated with PEI.</P> <P>[DISPLAY OMISSION]</P>