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Cho, Joon-Hyung,Jeon, Soo-Bin,Kang, Min-Kyoung,Kim, Jin-Seop,Cho, Sang-Won,Oh, Kwang-Joong Elsevier 2017 Separation and purification technology Vol.184 No.-
<P><B>Abstract</B></P> <P>Ion exchange technology is the most effective and economical to remove heat stable salts (HSS) in CO<SUB>2</SUB> absorption processes. However, the disadvantage of high waste generation remains an unsolved problem. This study attempted to reduce the amount of waste generated during the Zr(OH)<SUB>5</SUB> <SUP>−</SUP> regeneration process through resource recovery by using ZrCl<SUB>4</SUB> coagulant, then recycling the recovered Zr(OH)<SUB>4</SUB> precipitate to produce Zr(OH)<SUB>5</SUB> <SUP>−</SUP> regenerant. The experimental results showed a waste coagulant efficiency of about 75%. The coagulation mechanism was suggested based on the conductivity and zeta potential analysis. The recovered Zr(OH)<SUB>4</SUB> had no differences in terms of chemical composition and regeneration efficiency, when compared with virgin material. These results indicate that the recovery and recycling of Zr(OH)<SUB>4</SUB> from the waste stream using ZrCl<SUB>4</SUB> as a coagulant reduced a large amount of the waste generated from the ion exchange process.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Reduction efficiency using ZrCl<SUB>4</SUB> coagulant from ion exchange waste is about 75.0%. </LI> <LI> Coagulation mechanism of four stages with respect to the coagulant dose is proposed. </LI> <LI> Recovery efficiency of hydroxide, as Zr(OH)<SUB>4</SUB>, from the waste is about 99.2%. </LI> <LI> The recovered Zr(OH)<SUB>4</SUB> has no difference in regeneration efficiency of virgin material. </LI> </UL> </P>
Cho, Joon-Hyung,Jeon, Soo-Bin,Yang, Kyeong-Soon,Seo, Jong-Beom,Cho, Sang-Won,Oh, Kwang-Joong Elsevier 2015 Separation and purification technology Vol.156 No.2
<P><B>Abstract</B></P> <P>In the CO<SUB>2</SUB> absorption process, heat stable salts (HSS) have been reported to be a major cause of operational problems, such as excessive foaming, corrosion, amine loss, and capacity reduction. Ion exchange technology has been the most effective and economical way for the removal of HSS. However, the disadvantage of this technology is its low regeneration efficiency. This study attempted to improve the low regeneration efficiency of anion exchange resin loaded with HSS by using a novel zirconium pentahydroxide (ZrOH<SUB>5</SUB> <SUP>−</SUP>) displacement technique. The experimental results showed, in the batch system, that the most effective potential metal-hydroxide regenerant, Zr(OH)<SUB>5</SUB> <SUP>−</SUP>, exhibited an efficiency that is 15.2% higher than for conventional NaOH, and in the continuous system, Zr(OH)<SUB>5</SUB> <SUP>−</SUP> had an efficiency that is 28.0–17.8% higher for 1.5–5bed volume (BV). The differences of the BV corresponded to the breakthrough point for the initial breakthrough and after the 1st and 2nd regenerations were only 1.5–3.9%, which means that there was no significant deterioration of the resin’s performance by Zr(OH)<SUB>5</SUB> <SUP>−</SUP> regeneration. The mechanism of the general ion exchange steps as well as the regeneration by Zr(OH)<SUB>5</SUB> <SUP>−</SUP> was determined by performing an FT-IR analysis. These results indicate that the novel Zr(OH)<SUB>5</SUB> <SUP>−</SUP> displacement technique improves the low regeneration efficiency of the ion exchange process.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The Zr(OH)<SUB>5</SUB> <SUP>−</SUP> is the most effective regenerant of the candidates that were tested. </LI> <LI> The Zr(OH)<SUB>5</SUB> <SUP>−</SUP> exhibits higher regeneration efficiency than for conventional NaOH. </LI> <LI> There is no significant deterioration of the resin’s performance by Zr(OH)<SUB>5</SUB> <SUP>−</SUP>. </LI> <LI> The regeneration mechanism for water structure enforced-ion pairing is proposed. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Jeon, Soo-Bin,Cho, Joon-Hyung,Kang, Min-Kyoung,Lee, Sang-Sup,Kim, Bong-jun,Oh, Kwang-Joong Elsevier 2017 Journal of the Taiwan Institute of Chemical Engine Vol.81 No.-
<P><B>Abstract</B></P> <P>Rate constants for the reaction of aqueous 2-amino-2-methyl-1-propanol (AMP)/ammonia (NH<SUB>3</SUB>) solutions with SO<SUB>2</SUB> were determined by measuring their SO<SUB>2</SUB> absorption rates. The SO<SUB>2</SUB> absorption characteristics of 30 wt% AMP solutions with added NH<SUB>3</SUB>(1, 3, and 5 wt%) were investigated using a stirred-cell reactor, and the rates of SO<SUB>2</SUB> absorption into the aqueous blended amine solutions were measured. The addition of 5 wt% NH<SUB>3</SUB> to AMP significantly increases the SO<SUB>2</SUB> absorption rate, as well as the rate constant for the reaction of AMP with SO<SUB>2</SUB> by 197%. The relevant Arrhenius expressions were found to be <SUB> k A M P , S <SUB> O 2 </SUB> </SUB> = 50.787 × 1 <SUP> 0 7 </SUP> exp ( − 3880.47 / T ) , and <SUB> k A M P + N <SUB> H 3 </SUB> , S <SUB> O 2 </SUB> </SUB> = 377.168 × 1 <SUP> 0 7 </SUP> exp ( − 4283.71 / T ) .</P> <P><B>Highlights</B></P> <P> <UL> <LI> The SO<SUB>2</SUB> mass transfer resistance of liquid phase between 5 and 15 kPa was disregarded. </LI> <LI> The SO<SUB>2</SUB> absorption rate on each absorbent increased exponentially proportional to the NH<SUB>3</SUB> addition. </LI> <LI> The absorption rate of SO<SUB>2</SUB> increased exponentially along partial pressure increase at each temperature. </LI> <LI> The overall reaction of SO<SUB>2</SUB> with AMP/NH<SUB>3</SUB> solution is the instantaneous reaction. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Oh, Sang Hoon,Jeon, Jongsoo Council on Tall Building and Urban Habitat Korea 2014 International journal of high-rise buildings Vol.3 No.2
The story shear force distributions of most seismic design codes generally reflect the influences of higher vibration modes based on the elastic deformations of structures. However, as the seismic design allows for the plastic behavior of a structure, the story shear force distribution shall be effective after it is yielded due to earthquake excitation. Hence this study conducted numerical analyses on the story shear force distributions of most seismic design codes to find out the characteristics of how a structure is damaged between stories. Analysis results show that the more forces are distributed onto high stories, the lower its concentration is and the more energy is absorbed. From the results, this study proposes the optimum story shear force distribution and its calculation formula that make the damages uniformly distributed onto whole stories. Consequently, the story damage distribution from the optimum calculation formula was considerably more stable than existing seismic design codes.
Sang Hyeon Park,Du Chang Jang,Hara Jeon,Oh Yi Gyeong,임애란 한국자기공명학회 2022 Journal of the Korean Magnetic Resonance Society Vol.26 No.1
The phase transition temperatures of CsCoCl3·2H2O crystals are investigated via differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). Three endothermic peaks at temperatures of 370 K (=TC1), 390 K (=TC2), and 416 K (=TC3) were observed for phase transitions from CsCoCl3·2H2O to CsCoCl3· 1.5H2O, to CsCoCl3·H2O, and then to CsCoCl3· 0.5H2O, respectively. In addition, the spin-lattice relaxation time T1ρ in the rotating frame and T1 in the laboratory frame as well as changes in chemical shifts for 1H and 133Cs near TC1 were found to be temperature dependent. Our analyses results indicated that the changes of chemical shifts, T1ρ, and T1 are associated with structural phase transitions near temperature TC1. The changes of chemical shifts, T1ρ, and T1 near TC1 were associated with structural phase transitions, owing to the changes in the symmetry of the structure formed of H2O and Cs+ ions. Consequently, the structural symmetry in CsCoCl3·2H2O crystals based on temperature is discussed by the environments of their H and Cs nuclei.
Clausena anisata-mediated protection against lipopolysaccharide-induced acute lung injury in mice
JEON, CHAN-MI,SHIN, IN-SIK,SHIN, NA-RAE,HONG, JU-MI,KWON, OK-KYOUNG,KIM, JUNG-HEE,OH, SEI-RYANG,BACH, TRAN-THE,HAI, DO-VAN,QUANG, BUI-HONG,CHOI, SANG-HO,LEE, JOONGKU,MYUNG, PYUNG-KEUN,AHN, KYUNG-SEOP Spandidos Publications 2016 INTERNATIONAL JOURNAL OF MOLECULAR MEDICINE Vol.37 No.4
<P>Clausena anisata (Willd.) Hook.f. ex Benth. (CA), which is widely used in traditional medicine, reportedly exerts antitumor, anti-inflammatory and other important therapeutic effects. The aim of the present study was to investigate the potential therapeutic effects of CA in a mouse model of lipopolysaccharide (LPS)-induced acute lung injury (ALI) and in LPS-stimulated RAW 264.7 cells. Male C57BL/6 mice were administered treatments for 3 days by oral gavage. On day 3, the mice were instilled intranasally with LPS or PBS followed 3 h later by oral CA (30 mg/kg) or vehicle administration. In vitro, CA decreased nitric oxide (NO) production and pro-inflammatory cytokines, such as interleukin (IL)-6 and prostaglandin E2 (PGE(2)), in LPS-stimulated RAW 264.7 cells. CA also reduced the expression of pro-inflammatory mediators, such as cyclooxygenase-2. In vivo, CA administration significantly reduced inflammatory cell numbers in the bronchoalveolar lavage fluid (BALF) and suppressed pro-inflammatory cytokine levels, including tumor necrosis factor-alpha (TNF-alpha), IL-6, and IL-1 beta, as well as reactive oxygen species production in the BALF. CA also effectively reduced airway inflammation in mouse lung tissue of an LPS-induced ALI mouse model, in addition to decreasing inhibitor kappa B (I kappa B) and nuclear factor-kappa B (NF-kappa B) p65 phosphorylation. Taken together, the findings demonstrated that CA inhibited inflammatory responses in a mouse model of LPS-induced ALI and in LPS-stimulated RAW 264.7 cells. Thus, CA is a potential candidate for development as an adjunctive treatment for inflammatory disorders, such as ALI.</P>