ASEAN Journal of Chemical Engineering
The ASEAN Journal of Chemical Engineering publishes papers on Chemical Engineering, specifically but not limited to the areas of thermodynamics, reaction kinetics, transport phenomena, process control, environment, energy, biotechnology, corrosion, separation science, powder technology, materials science, and chemical engineering education
Articles
362 Documents
<![CDATA[A thermodynamic Lyapunov Approach to the Stability Analysis of a Nonlinear Irreversible Process Having Multiplicity ]]>
<![CDATA[Thuan C. Nguyen]]>;
<![CDATA[Ha N. Hoang]]>
<![CDATA[ ASEAN Journal of Chemical Engineering Vol 17, No 1 (2017) ]]>
Publisher : <![CDATA[Department of Chemical Engineering, Universitas Gadjah Mada ]]>
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DOI: 10.22146/ajche.49561
<![CDATA[Following the second law of thermodynamics, the entropy is always created in irreversible processes such as reacting systems, etc. Under certain operating conditions, the reaction system can be operated with multiple steady states (also called the steady state multiplicity behavior). This behavior is considered for the illustration of the stability analysis of all possible steady states by Lyapunov methods using thermodynamics. More precisely, a novel symmetric storage function (or Lyapunov function candidate) is proposed on the basis of the so-called (non-symmetric) thermodynamic availability function. The acid-catalyzed hydration of 2-3-epoxy-1-propanol to glycerol subject to steady state multiplicity is used for further technical developments. The results are discussed with the inclusions of the simulations.]]>
<![CDATA[Kinetic Study of Aluminum – Alginate Catalyzed Esterification of Lactic Acid with 1-Butanol ]]>
<![CDATA[Kanungnit Chawong]]>;
<![CDATA[Chitkamon Poncharee]]>;
<![CDATA[Boonpradab Daengpradab]]>;
<![CDATA[Panarat Rattanaphanee]]>
<![CDATA[ ASEAN Journal of Chemical Engineering Vol 17, No 1 (2017) ]]>
Publisher : <![CDATA[Department of Chemical Engineering, Universitas Gadjah Mada ]]>
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DOI: 10.22146/ajche.49562
<![CDATA[Aluminum-alginate catalyst prepared from aluminum chloride and inexpensive biopolymer sodium alginate is used in lactic acid esterification with 1-butanol. Effect of initial reactant molar ratio, catalyst loading and reaction temperature on the acid conversion is investigated. Maximum conversion of about 81.2% was achieved after 6 h of reaction at 85°C with initial 1-butanol-to-lactic-acid molar ratio of 5 and catalyst loading of 1%w/v. Experimental kinetic data are correlated by pseudo-homogeneous model using UNIFAC to describe non-ideality of the reaction components. Satisfactory agreement between the experimental and calculated data is achieved. The specific rate and equilibrium constant for this reaction are reported.]]>
<![CDATA[Molecular Dynamics Simulation of the Nano- scale Solutal Marangoni Convection ]]>
<![CDATA[Yosuke Imai]]>;
<![CDATA[Takuya Yamamoto]]>;
<![CDATA[Yasunori Okano]]>;
<![CDATA[Ryuma Sato]]>;
<![CDATA[Yasuteru Shigeta]]>
<![CDATA[ ASEAN Journal of Chemical Engineering Vol 17, No 1 (2017) ]]>
Publisher : <![CDATA[Department of Chemical Engineering, Universitas Gadjah Mada ]]>
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DOI: 10.22146/ajche.49563
<![CDATA[Non-equilibrium molecular dynamics simulations for the 2- and 3-phase systems were performed to investigate the flow with two free surfaces in a nanoscale, where solute, water, and argon were assigned as each phase. We observed that the behaviors of some 3-phase systems significantly differ from those of 2-phase systems. In all 2- phase systems, the solutes just diffused into the water phase. On the other hand, the solutes were transferred along the liquid-gas interfaces in the case of 3-phase systems with a large surface tension gradient. These results indicated that solutal Marangoni convection existed even in the nano-scale and it affected mass transfer greatly.]]>
<![CDATA[Modification of Natural Zeolite as a Catalystfor Steam Reforming of Toluene ]]>
<![CDATA[Joko Waluyo]]>;
<![CDATA[Tobias Richards]]>;
<![CDATA[IGBN Makertihartha]]>;
<![CDATA[Herri Susanto]]>
<![CDATA[ ASEAN Journal of Chemical Engineering Vol 17, No 1 (2017) ]]>
Publisher : <![CDATA[Department of Chemical Engineering, Universitas Gadjah Mada ]]>
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DOI: 10.22146/ajche.49564
<![CDATA[A catalyst for tar cracking has been prepared successfully from natural zeolites using ion exchange with NH4NO3, and acid leaching with HNO3 solution for removing impurities and increasing pore volume. The activity of the modified zeolite was tested using toluene as a tar model compound. Tar conversion of about 54% was achieved in catalytic steam reforming at a temperature of 750C using 2 gram of catalyst and the gas hourly space velocity about 5040 h-1.]]>
<![CDATA[Polyamide Chain Growth and Crosslinking: The Controlling Determinants for Properties of Thin Film Composite Membrane ]]>
<![CDATA[J.J. Beh]]>;
<![CDATA[E.P. Ng]]>;
<![CDATA[B.S. Ooi]]>
<![CDATA[ ASEAN Journal of Chemical Engineering Vol 17, No 1 (2017) ]]>
Publisher : <![CDATA[Department of Chemical Engineering, Universitas Gadjah Mada ]]>
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DOI: 10.22146/ajche.49565
<![CDATA[The desired features of a polyamide thin film composite (TFC) membrane for desalination can be tailored through careful control of membrane preparation condition. This work aims to provide more comprehensive understanding on polyamide film formation chemistry in order to correlate the membrane synthesis condition with its characteristics. Three series of TFC membranes were prepared by interfacial polymerization with adjustment of m-phenylenediamine (MPD) and trimesoyl chloride (TMC) monomer concentration as well as reaction duration. The membrane structural properties were evaluated based on glucose permeation then correlated with the transport and charge behaviors of membrane determined from pure water and inorganic salt permeation. During interfacial polymerization, competition occurs between polyamide chain growth and crosslinking. It was found that higher MPD concentration promoted polyamide chain crosslinking while increasing TMC concentration favored polyamide chain growth during diffusion-limited growth stage. Meanwhile, prolonged degree of polyamide chain growth and crosslinking occurred at longer reaction duration, which eventually caused self-limiting membrane growth. The water transport was primarily controlled by polyamide film thickness, porosity and hydrophilicity while size exclusion and Donnan exclusion worked in tandem in governing the salt separation. The TFC membrane synthesized at 3 w/v% MPD concentration and 0.10 w/v% TMC concentration under 60 s reaction duration achieved the best desalination performance with pure water permeability of 0.853 L/m2·h·bar and 81.4 % NaCl rejection.]]>
<![CDATA[Application of System Approach for Design and Operation of Process Control Systems in Oil and Gas Industry ]]>
<![CDATA[Le Xuan Hai]]>;
<![CDATA[Vo Viet Hai]]>
<![CDATA[ ASEAN Journal of Chemical Engineering Vol 17, No 1 (2017) ]]>
Publisher : <![CDATA[Department of Chemical Engineering, Universitas Gadjah Mada ]]>
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DOI: 10.22146/ajche.49566
<![CDATA[Process Control Systems are essential parts in oil and gas production plants. The design and operations of these systems are really complex because they must comply with stringent technical requirements, as well as safety and environmental regulations from authorities and third party certifying agents. In order to simplify and systemize the design and operation, in this study, we have built a logical Flow Chart of System Approach and applied it for study and performing the relevant works for Process Control Systems.]]>
<![CDATA[Numerical Study of Fluid Dynamics in Suspension Culture of iPS Cells ]]>
<![CDATA[Masaki Yano]]>;
<![CDATA[Takuya Yamamoto]]>;
<![CDATA[Yasunori Okano]]>;
<![CDATA[Toshiyuki Kanamori]]>;
<![CDATA[Mashiro Kino–oka]]>
<![CDATA[ ASEAN Journal of Chemical Engineering Vol 17, No 1 (2017) ]]>
Publisher : <![CDATA[Department of Chemical Engineering, Universitas Gadjah Mada ]]>
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DOI: 10.22146/ajche.49567
<![CDATA[In a suspension culture of iPS cells, the shear stress generated during mixing is expected to promote differentiation of induced pluripotent stem (iPS) cells. The stress on the cells can be controlled by rotational rate and shape of impeller. However, it is difficult to optimize these operative parameters by experiments. Therefore, we have developed a numerical model to obtain the average and the maximum shear stress in two kinds of stirred tanks and an orbital shaking cylindrical container. The present results showed that the shear stress strongly depended on the type of mixing and lesser extent on the shape of the impeller. The average shear stress is larger in the shaking mode than that in the stirring mode. In contrast, the maximum shear stress is much smaller in the shaking than the stirring. These results suggest that stirring and shaking should be selectively used depending on the application]]>
<![CDATA[Numerical Investigation on Multiphase Flows in Various Configurations of Microchannels Using Computational Fluid Dynamics ]]>
<![CDATA[Mohd Fadhil Majnis]]>;
<![CDATA[Mohamad Rawad Jalwan]]>
<![CDATA[ ASEAN Journal of Chemical Engineering Vol 17, No 1 (2017) ]]>
Publisher : <![CDATA[Department of Chemical Engineering, Universitas Gadjah Mada ]]>
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DOI: 10.22146/ajche.49568
<![CDATA[A two-dimensional domain of multiphase flow analyses in this study using the Volume of Fluid (VOF) model was carried out in order to simulate and predict the fluid flows and mixing performance of two miscible liquids in various microchannel configurations. The various microchannels configurations were designed accordingly and the simulation was carried out based on the justified conditions, assumptions and considerations by using the commercial computational fluid dynamics (CFD) software, FLUENT. The grid type and size of the computational domain were verified in terms of stability by performing the grid independence analysis. The result showed that static mixing would be possible to achieve in various configurations of microchannels, however, the simulation results predicted that it appeared to be more efficient in complex and retrofitted microchannels. It showed the potential to promote and enhance chaotic advection, compositions distribution, and diffusivity as compared to basic microchannels that are mostly dependent only on the injection focus. Furthermore, the Reynolds number appeared to be a significant factor to enhance the mixing performance in microchannel beside the configurations.]]>
<![CDATA[The Development of Lithium Ion Recovery Method by Activated Carbon and Natural Zeolite-based Adsorbent ]]>
<![CDATA[Chandra Wahyu Purnomo]]>;
<![CDATA[Endhy Kesuma]]>;
<![CDATA[Sang Kompiang Wirawan]]>;
<![CDATA[Hirofumi Hinode]]>
<![CDATA[ ASEAN Journal of Chemical Engineering Vol 17, No 1 (2017) ]]>
Publisher : <![CDATA[Department of Chemical Engineering, Universitas Gadjah Mada ]]>
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DOI: 10.22146/ajche.49569
<![CDATA[Coconut shell char and natural zeolite been activated and then tested to separate between lithium and cobalt ions in solutions. The capacity of adsorption and selectivity between the ions were investigated. The longer adsorption time, the capacity was getting better but the selectivity decreased. It was observed that the optimum selectivity was obtained by 3 hours adsorption using activated carbon. The chemical activated sample has superior performance and selectivity compared with physical activation carbons of the same activation temperature. After the adsorption, pure lithium solution can be obtained while the other metal is adsorbed inside the adsorbent]]>
<![CDATA[CFD Analysis of Indoor Chlorine Gas Dispersion Storage: Temperatures, Wind Velocities and Ventilation Effects Studies ]]>
<![CDATA[M. Safakar]]>;
<![CDATA[S. Syafiie]]>;
<![CDATA[R. Yunus]]>
<![CDATA[ ASEAN Journal of Chemical Engineering Vol 16, No 1 (2016) ]]>
Publisher : <![CDATA[Department of Chemical Engineering, Universitas Gadjah Mada ]]>
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DOI: 10.22146/ajche.49669
<![CDATA[The Chemical products factories encounter inherent environmental risks in the process. The indoor release of hazardous chemical gases that are heavier than the air is nowadays a special subject for scrutiny because the dense clouds of the gas have a tendency to insist on the ground level or near the human breath level, causing fatal injuries or other potential health threats to human beings. In this study, a computational fluid dynamics (CFD) code FLUENT was employed in order to model the accidental indoor dispersion of a dense gas (chlorine) from a small undetected leak in an indoor industrial environment. Furthermore, the effects of different temperatures, wind velocities and ventilation on diffusion of chlorine are investigated in this paper. Results of the simulations represented that the chlorine gas dispersion would behave like the liquid and currents on the floor. It was also found that the chlorine concentration above the ground level increased slowly. Showing the effects of various temperatures and wind on spreading the dense gas will help to better identify the potential risks. In this research, the effects of the environmental situations with the release and spread of chlorine in the indoor space were meticulously investigated.]]>
