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Sungyong Mun 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.6
The optimal design of the batch chromatographic process for separation of valine (product) from isoleucine and leucine (side-products) was carried out by using the relevant optimization tool that was prepared on the basis of an up-to-date genetic algorithm. In such an optimal design, the flow rate, feed size (Δfeed), eluent gap size (Δgap), and product collection time were optimized to maximize the valine productivity of the batch chromatographic process under consideration. The results showed that the valine productivity was governed by the flow rate in the region of low flow rates, whereas it was governed by the Δgap/Δfeed factor in the region of high flow rates. Finally, the effect of valine yield on the productivity was investigated, followed by providing the proper operating conditions that could be advantageous to both valine productivity and valine yield.
Elsevier 2018 Journal of chromatography Vol.1575 No.-
<P><B>Abstract</B></P> <P>The effectiveness of a simulated moving bed (SMB) technology in the continuous separation of fucose from a multi-component monosugar mixture, which stemmed from defatted microalgae, has recently been identified. To guarantee high economical efficiency of such fucose-production method, the comprehensive optimization of the relevant fucose-separation SMB process needs to be accomplished such that its production rate (<I>Prate</I>) and/or productivity (<I>Prod</I>) can be maximized while meeting the requirements on fucose product concentration (<I>C</I> <SUB>prod,F</SUB>) and pressure drop (ΔP<SUB>SMB</SUB>). To resolve this issue, the SMB optimization program based on standing-wave-design method and genetic algorithm was prepared and then applied to the fucose-separation SMB optimization. It was found that the <I>Prate</I>, under a given particle size, could reach its maximum when the column length was selected to create a balance between the effects of the two limiting factors related to <I>C</I> <SUB>prod,F</SUB> and ΔP<SUB>SMB</SUB>. It was also found that the <I>Prate</I> was governed by fucose yield, if the SMB would be in need of a relatively high <I>C</I> <SUB>prod,F</SUB>; otherwise, the <I>Prate</I> was governed by feed flow rate. If the particle size of the SMB adsorbent was fixed at one of the commercially available ones, the SMB conditions leading to the highest <I>Prate</I> and the highest <I>Prod</I> coincided with each other. By contrast, if the particle size was included as one of optimization variables, the <I>Prate</I> and <I>Prod</I> represented a trade-off relationship. Finally, it was confirmed from the simultaneous optimization for <I>Prate</I> and <I>Prod</I> that the increase of particle size improved <I>Prate</I> at the cost of <I>Prod</I>, thereby causing the maximum <I>Prod</I> to be always attained at a smaller particle size than the maximum <I>Prate</I> regardless of the target <I>C</I> <SUB>prod,F</SUB> level.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Fucose-separation SMB was optimized using standing-wave-design and genetic algorithm. </LI> <LI> It was aimed at maximizing the production rate (<I>Prate</I>) and/or productivity (<I>Prod</I>). </LI> <LI> Balancing between the limiting factors for <I>C</I> <SUB>prod,F</SUB> and ΔP<SUB>SMB</SUB> led to a maximum <I>Prate</I>. </LI> <LI> If particle size is optimized, <I>Prate</I> and <I>Prod</I> represent a trade-off relationship. </LI> <LI> The increase of particle size led to an improvement in <I>Prate</I> but a reduction in <I>Prod</I>. </LI> </UL> </P>
The Society of Chemical Engineers, Japan 2006 Journal of chemical engineering of Japan Vol.39 No.10
<P>In this study, several new operating strategies are presented to enhance the separation performance of an SMB process. The basic principle of the new operating strategies is to add more outlet ports (raffinate or extract) to a conventional SMB system. The advantage of the SMB based on the new operating strategies over a conventional SMB is validated with a series of detailed simulations.</P>
Elsevier 2014 Journal of chromatography Vol.1341 No.-
The three-zone simulated moving bed (SMB) chromatographic process for separation of succinic acid and lactic acid, which has been developed previously, was based on a classical port-location arrangement (desorbent -> extract -> feed -> raffinate) and a classical feeding mode (full-feeding). To improve the performance of the three-zone SMB process, it is worth utilizing the strategy of either a port-location rearrangement (desorbent -> feed -> raffinate -> extract) or a partial-feeding. To investigate which of the two strategies is more effective, the three-zone SMBs based on the port-location rearrangement (PR) and the partial-feeding (PF) were optimized each under equal conditions and then the two strategies were compared in terms of product purities or throughput. The result showed that the PR strategy led to higher purities or higher throughput than the PF strategy in regard to the previously reported three-zone SMB system. To check whether such trend is still valid in other separation systems, the above optimization works were repeated while varying only the selectivity between two feed components. It was confirmed that the PR strategy is definitely superior to the PF strategy. However, such superiority of the PR over the PF strategy is lessened as the selectivity becomes lower. If the selectivity is significantly low, the PR strategy is rather outperformed by the PF strategy. (C) 2014 Elsevier B.V. All rights reserved.
Lee, Chan Hyun,Mun, Sungyong,Lee, Ki Bong Elsevier 2015 Journal of Power Sources Vol.281 No.-
<P><B>Abstract</B></P> <P>Hydrogen has been gaining popularity as a new clean energy carrier, and bulk hydrogen production is achieved through the steam methane reforming (SMR) reaction. Since hydrogen produced via the SMR reaction contains large amounts of impurities such as unreacted reactants and byproducts, additional purification steps are needed to produce high-purity hydrogen. By applying the sorption-enhanced reaction (SER), in which catalytic reaction and CO<SUB>2</SUB> byproduct removal are carried out simultaneously in a single reactor, high-purity hydrogen can be directly produced. Additionally, the thermodynamic limitation of conventional SMR reaction is circumvented, and the SMR reaction process becomes simplified. To improve the performance of the SER, a multisection packing concept was recently proposed. In this study, the multisection packing concept is experimentally demonstrated by applying it to a sorption-enhanced SMR (SE-SMR) reaction. The experimental results show that the SE-SMR reaction is significantly influenced by the reaction temperature, owing to the conflicting dependence of the reaction rate and the CO<SUB>2</SUB> sorption uptake on the reaction temperature. Additionally, it is confirmed that more high-purity hydrogen (<10 ppm of CO) can be produced by applying the multisection packing concept to the SE-SMR reactions operated at sufficiently high temperatures where the SMR reaction is not limited by rate.</P> <P><B>Highlights</B></P> <P> <UL> <LI> SE-SMR reaction was performed using catalyst–sorbent mixture at various temperatures. </LI> <LI> The SE-SMR reaction performance is highly dependent on the reaction temperature. </LI> <LI> The multisection packing concept was successfully applied to the SE-SMR reaction. </LI> <LI> More high-purity H<SUB>2</SUB> is produced with multisection packing. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
쿨링용 슬레트 핀 M/C Form Roll의 Roll Stand부 마찰 특성
최원식(Wonsik Choi),이성용(Sungyong Lee),권주리(Jury Kwon),진은영(Eunyoung Jin),문희준(Heejoon Mun),이인(In Lee) 한국트라이볼로지학회 2010 한국윤활학회지(윤활학회지) Vol.26 No.1
This study investigates the friction of the roll stands in the high performance multi- holes slate fin machine which pin is using in heat transfer of radiator, oil cooler, inter cooler, condenser and evaporator. The roll stand part is very important to maintain the high performance fin machine. This multi-holes form roll type is the first time in our country so it will be helpful to increases the export and product of heat transfer. It was include the technical of form rolling system which was self development. Then it will be improve the electric home appliances, future motor vehicle device and industrial machine.
Separation of Acetic Acid, Formic Acid, Succinic Acid, and Lactic Acid Using Adsorbent Resin
Nam, Hee-Geun,Lim, Geon-Woo,Mun, Sungyong American Chemical Society 2012 Journal of chemical and engineering data Vol.57 No.8
<P>The single-component adsorption equilibria of acetic acid and formic acid on an Amberchrom-CG300C resin were measured using a staircase frontal analysis method over the temperature range from (30 to 50) °C at liquid-phase concentrations of up to 10 g·L<SUP>–1</SUP>. The resultant adsorption data were correlated with the Langmuir model, and the corresponding model parameters were determined. In addition, the effect of temperature on the Langmuir equilibrium constants was investigated, and the results were utilized to determine the thermodynamic parameters for the adsorption of interest. The results of these investigations indicated that the adsorption of each organic acid onto Amberchrom CG300C is exothermic and controlled by physical mechanisms. Furthermore, a temperature-modulated adsorption model for each organic acid was developed by incorporating its thermodynamic parameters into the Langmuir model. The resultant temperature-modulated Langmuir model equation was confirmed to be highly accurate in predicting all of the adsorption equilibrium data acquired over the investigated temperature range. The adsorption equilibrium data and the model parameters reported in this study will be of great value in designing a chromatographic process for separating the organic acid mixture resulting from fermentation based on Actinobacillus bacteria.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jceaax/2012/jceaax.2012.57.issue-8/je201065u/production/images/medium/je-2011-01065u_0009.gif'></P>