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
372 Documents
<![CDATA[Effect Of Pre-Treatment And Inoculant During Composting Of Palm Oil Empty Fruit Bunches ]]>
<![CDATA[A.Y. Zahrim]]>;
<![CDATA[I.K.T. Yee]]>;
<![CDATA[E.S.C. Thian]]>;
<![CDATA[S.Y. Heng]]>;
<![CDATA[J. Janaun]]>;
<![CDATA[K.P. Chong]]>;
<![CDATA[S.K. Haywood]]>;
<![CDATA[V. Tan]]>;
<![CDATA[T. Asis]]>;
<![CDATA[T.M.T.M.A. Al-Mizi]]>
<![CDATA[ ASEAN Journal of Chemical Engineering Vol 17, No 2 (2017) ]]>
Publisher : <![CDATA[Department of Chemical Engineering, Universitas Gadjah Mada ]]>
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DOI: 10.22146/ajche.49551
<![CDATA[In this work, untreated empty fruit bunch (EFB) or microwave-assisted NaOHpretreated EFB with palm oil mill effluent (POME) were composted under mesophilicconditions either in the presence or absence of Bacillus amyloliquefaciens D203 for sixtydays. During pretreatment conditions, the EFB was mixed with 1% (w/w) sodiumhydroxide and then exposed to microwave irradiation. The composting process wasevaluated based on the evolution of pH, electrical conductivity, moisture content, organicmatter loss, zeta potential and phytotoxicity. The strain Bacillus amyloliquefaciens D203 is not suitable for EFB-POME composting due to lower organic matter loss. The microwave-assisted NaOH pretreatment contributed to ~15% more organic matter loss than was found in the untreated sample while its germination index was >50%.]]>
<![CDATA[Transient Cooling Of A Cylinder In Cross Flow Bounded By An Adiabatic Wall ]]>
<![CDATA[Nawaf H Saeid]]>;
<![CDATA[Bashir S. Abusahmin]]>
<![CDATA[ ASEAN Journal of Chemical Engineering Vol 17, No 2 (2017) ]]>
Publisher : <![CDATA[Department of Chemical Engineering, Universitas Gadjah Mada ]]>
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DOI: 10.22146/ajche.49552
<![CDATA[The present study investigates the parameters controlling the cooling process of acylindrical food in the storage area for a period of time. Transient analysis of theconduction and convection (conjugate) heat transfer from a cylindrical food, or acylindrical can filled with food is selected for numerical simulations. The cylinder isbounded by an adiabatic wall and the cold air is flowing normal to the cylinder axis (crossflow). The parameters investigated are: Reynolds number, food thermal properties(density, specific heat and thermal conductivity) and the cooling period. The range of theReynolds number is selected from 50 to 500 to be in laminar flow conditions. Threedifferent materials were selected according their thermal properties. The results arepresented to show the cooling process starting from blowing cold air stream on thecylinder for a period of 4 hours. The results show that the food with low thermal inertia iscooled faster than that of high thermal inertia. The present results show also that thecooling process can be shortened by increasing the air velocity and lower its temperature.]]>
<![CDATA[Photocatalytic Hydrogen Production over Ni/La-NaTaO3 Nanoparticles from NaCl-water Solution in the Presence of Glucose as Electron Donor ]]>
<![CDATA[Husni Husin]]>;
<![CDATA[Komala Pontas]]>;
<![CDATA[Yunardi Yunardi]]>;
<![CDATA[Adi Salamun]]>;
<![CDATA[Pocut Nurul Alam]]>;
<![CDATA[Fikri Hasfita]]>
<![CDATA[ ASEAN Journal of Chemical Engineering Vol 17, No 2 (2017) ]]>
Publisher : <![CDATA[Department of Chemical Engineering, Universitas Gadjah Mada ]]>
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DOI: 10.22146/ajche.49553
<![CDATA[Nanoparticles La-NaTaO3 photocatalyst has been synthesized via a sol-gel route. A Ninanoparticle (NPs) as a cocatalyst is loaded on La-NaTaO3 by a simple impregnation method.The products are characterized by X-ray diffraction (XRD), scanning electron microscope(SEM), a high-resolution transmission electron microscope (HRTEM) and X-ray photoelectronspectroscopy (XPS). X-ray diffraction of the La-NaTaO3 samples shows perovskite-typecrystalline orthorhombic structure. Small particulate solids of La-NaTaO3 (30-250 nm) areobserved by SEM measurement. The nickel particles are detected from HRTEM images isaround 4-8 nm. The hydrogen evolution over La-NaTaO3 with NaCl is much higher than thatwithout NaCl. The photoactivity of La-NaTaO3 is enhanced when Ni is loaded on the surfaceof La-NaTaO3. The optimum loading amount of nickel is found to be 0.3 wt.% for La-NaTaO3,and it is more effective for H2 production from NaCl-water solution in the presence glucose.It is revealed that the loaded Ni can interact with each other and cooperate on improving thephotocatalytic activity. In the case of glucose as an electron donor, the activity ofphotocatalytic hydrogen generation over Ni/La-NaTaO3 increases dramatically. NaCl andglucose can promote markedly the photocatalytic hydrogen evolution. The Ni/La-NaTaO3nanoparticles system appears to be a promising candidate, which is very important to practicalapplications, including the production of H2 from NaCl-water solution in the presence ofglucose.]]>
<![CDATA[Ultrasonic Assisted Photolytic Degradation of Reactive Black 5 (RB5) Simulated Wastewater ]]>
<![CDATA[Collin G. Joseph]]>;
<![CDATA[Yun Hin Taufiq-Yap]]>;
<![CDATA[Vigneswar Krishnan]]>
<![CDATA[ ASEAN Journal of Chemical Engineering Vol 17, No 2 (2017) ]]>
Publisher : <![CDATA[Department of Chemical Engineering, Universitas Gadjah Mada ]]>
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DOI: 10.22146/ajche.49554
<![CDATA[The present study is based on a hybrid advanced oxidation process (AOP) of sono-photolysis system, of which sonication (35 kHz) and photolysis UV-C (254nm) were applied simultaneously to effectively degrade a selected recalcitrant dye-based pollutant, Reactive Black 5 (RB5). The influence of the solution pH and concentration were manipulated throughout this study to investigate the sonophotodegradation kinetics and synergistic effects on the RB5 degradation. Increasing the solution concentration resulted in lowered degradation rate due to the inner filter effect by the dye molecules and reduced the generation of hydroxyl radicals. The results confirmed that the sonophotolysis rate was better at basic medium (67.7%) in comparison to acidic medium (46.9%) due to the ionization of RB5. Synergistic effects were analyzed based on the first order kinetic rate model. It was found that the synergistic effect was observed for all the experiments conducted which resulted from an increase in the (•OH) radicals due to the photolysis of H2O2 formed by the sonolysis process. This hybrid system, sonophotolysis system, was able to degrade RB5 into intermediates with a total reaction time of 1h.]]>
<![CDATA[Assessment of Aqueous Lithium-based Salt Solutions as Working Fluid for Absorption Chillers using Aspen Plus ]]>
<![CDATA[Adonis P. Adornado]]>;
<![CDATA[Allan N. Soriano]]>;
<![CDATA[Vergel C. Bungay]]>
<![CDATA[ ASEAN Journal of Chemical Engineering Vol 17, No 2 (2017) ]]>
Publisher : <![CDATA[Department of Chemical Engineering, Universitas Gadjah Mada ]]>
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DOI: 10.22146/ajche.49555
<![CDATA[Absorption chillers are a viable option for providing waste heat-powered coolingor refrigeration, thereby improving overall energy efficiency-less primary energy input,lower emissions, and cost savings. This study focuses on the assessment of aqueouslithium-based salt solutions as working fluid for absorption chiller in exploring thepossibility of developing new mixtures for absorption chillers to improve the performanceof the absorption refrigeration systems (ARSs). In this paper, the coefficient ofperformance (COP) of a single-effect absorption chiller using aqueous lithium-based saltsolutions (LiF-H2O, LiCl-H2O, LiBr-H2O, and LiI-H2O) as working fluid was assessed usingAspen Plus®. The simulation results obtained showed that the mass and energy were wellbalanced for all systems. Furthermore, a direct proportionality relationship between COPof absorption chillers and the van't Hoff factor, i of dissociated aqueous salt solutions wasobserved. The highest COP value is 0.8930 for LiI-H2O among others.]]>
<![CDATA[Open Loop Recycling of Recycled Polypropylene for Motorcycle Saddle Application ]]>
<![CDATA[Piyachat Wattanachai]]>;
<![CDATA[Benjawan Buasathain]]>;
<![CDATA[Christian Antonio]]>;
<![CDATA[Susan Roces]]>
<![CDATA[ ASEAN Journal of Chemical Engineering Vol 17, No 2 (2017) ]]>
Publisher : <![CDATA[Department of Chemical Engineering, Universitas Gadjah Mada ]]>
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DOI: 10.22146/ajche.49556
<![CDATA[This research investigated the possibility of using polymer blends of virgin andrecycled polypropylene (PP) for a motorcycle saddle application. Three differentrecycled PPs obtained from different sources contained carbon black (CB). Specimenswere prepared by injection molding for mechanical property testing and colorcharacterization whereas scraps from runners were used for thermal property testing. Itwas found that tensile and flexural properties of recycled PPs were better than those ofvirgin PP due to the fact that recycled PPs contained CB which is a reinforcing material.These properties were improved as the amount of recycled PP added increased. Sincerecycled PPs are strong materials, they are hence brittle resulting in lowering impactstrength and percent elongation. The recycled PP sources and compatibility betweenvirgin and recycled PPs strongly influence the blends' properties. The melt flow index ofthe blends increased as the amount of the recycled PP increased because of the shortpolymer chains of recycled PP resulting from earlier processing. Blending virgin PP withrecycled PP not only improves its properties, but also reduces raw material costs in therange of 5-13%. The advantage of open loop recycling is a wider recycled plasticmarket.]]>
<![CDATA[Biosynthesis and Kinetics of Silver Nanoparticles Formation by Reduction using Banana Kepok (Musa balbisiana) Peel Extract ]]>
<![CDATA[Wara Dyah Pita Rengga]]>;
<![CDATA[Dhimas Setiawan]]>;
<![CDATA[Khosiatun Khosiatun]]>
<![CDATA[ ASEAN Journal of Chemical Engineering Vol 17, No 2 (2017) ]]>
Publisher : <![CDATA[Department of Chemical Engineering, Universitas Gadjah Mada ]]>
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DOI: 10.22146/ajche.49557
<![CDATA[Biosynthesis and silver nanoparticles formation during the reduction of AgNO3were carried out by using an aqueous peel extract of banana kepok (Musa balbisiana) asa stabilizing agent. The formation of the stable silver nanoparticles with differentconcentration of AgNO3 has resulted in mostly spherical particles. The Ultraviolet-Visiblespectrophotometer, Transmission Electron Microscopy, X-Ray Diffractometer were usedto characterize these biosynthesized silver nanoparticles. The spherical shapednanoparticles were uniformly distributed with the range diameter of 5 to 50 nm and theparticles were naturally crystallized with the crystal structure of the face-centered cubicgeometry. Additionally, the kinetics of the formation process of silver nanoparticles wasobserved by the UV-Vis spectrophotometer. Based on the kinetic functions, the reductionprocess of banana peel extract had a constant formation rate of the autocatalytic processat 4.35 x 10-4/s.]]>
<![CDATA[A Passivity Approach to the Stabilization of Free-Radical Polymerization Reactor ]]>
<![CDATA[Nguyen T. Sang]]>;
<![CDATA[Hoang N. Ha]]>;
<![CDATA[M.A. Hussain]]>
<![CDATA[ ASEAN Journal of Chemical Engineering Vol 17, No 2 (2017) ]]>
Publisher : <![CDATA[Department of Chemical Engineering, Universitas Gadjah Mada ]]>
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DOI: 10.22146/ajche.49558
<![CDATA[This work proposes a tracking error passivity-based multivariable control viafeedback passivation for a class of free-radical polymerization systems in a continuouslystirred tank reactor (CSTR). Firstly, this system dynamics with high nonlinearity ispassivized by input coordinate transformations, the resulting passive system is then rewritten into a canonical form strongly related to the so-called Port Control Hamiltonianstructure. Actually, this representation allows to show the physical meanings of systemdynamics such as dissipative, non-dissipative terms and supply rate. From this, a feedbackcontroller based on tracking error is designed for the globally exponential stabilization atan arbitrarily chosen reference trajectory passing the desired equilibrium point. Thetheoretical developments are then illustrated for polystyrene polymerization system inthe CSTR. The numerical simulations show that the trajectories of styrene polymerizationsystem considered as an illustrative example of FRP system converges globallyexponentially to the imposed trajectories.]]>
<![CDATA[Process Optimization of Carbon Dioxide Adsorption using Nitrogen-Functionalized Graphene Oxide via Response Surface Methodology Approach ]]>
<![CDATA[Fritzie Hannah B. Baldovino]]>;
<![CDATA[Nathaniel P. Dugos]]>;
<![CDATA[Susan A. Roces]]>;
<![CDATA[Armando T. Quitain]]>;
<![CDATA[Tetsuya Kida]]>
<![CDATA[ ASEAN Journal of Chemical Engineering Vol 17, No 2 (2017) ]]>
Publisher : <![CDATA[Department of Chemical Engineering, Universitas Gadjah Mada ]]>
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DOI: 10.22146/ajche.49559
<![CDATA[This paper presents a response surface methodology approach in the optimizationof the carbon dioxide temperature-programmed adsorption process using a new materialreferred as nitrogen-functionalized graphene oxide. This material was synthesized byloading nitrogen groups to graphene oxide using aqueous ammonia in supercriticalcondition. Later on, it was utilized as a sorbent for carbon dioxide adsorption. This process was optimized by implementing a response surface methodology coupled with a Box- Behnken design for the effects of three factors: adsorption temperature, carbon dioxide flow rate, and the amount of adsorbent. In analyzing the response surface, a model equation was generated based on the experimental data by regression analysis. This model equation was then utilized to predict optimum values of response. Furthermore, response optimizer was also conducted in identifying factor combination settings that jointly optimize the best response.]]>
<![CDATA[Kinetics of Oil-in-Water Emulsion Stabilization using Lecithin and Biosilica ]]>
<![CDATA[Lanny Sapei]]>;
<![CDATA[Olivia Poppy Damayanti]]>;
<![CDATA[Liliana Liliana]]>
<![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.49560
<![CDATA[Oil-in-water (O/W) emulsion has been widely used in food emulsions such as mayonnaise, dressings, and sauces. However, O/W emulsion is inherently thermodynamically unstable and easily destabilizes with time. Synthetic polymeric emulsifiers have been commonly used to stabilize these emulsions. However, those synthetic emulsifiers may induce obesity and other unexpected side-effects. In this experiment, bio-emulsifier mixtures consisting of soy lecithin and bio-silica were combined to stabilize the o/w emulsion in order to obtain more healthful food emulsions with acceptable quality. Lecithin concentrations were varied from 0.05-1.5% and concentrations of pure bio-silica particles derived from rice husks were in the range of 0.5-3%. The effects of the concentrations of these emulsifier mixtures on the O/W emulsions stability were studied. Additionally, the effects of storage temperatures on the O/W emulsions stability in the presence of both lecithin and bio-silica were investigated. The kinetics parameters of resulting O/W emulsions were analyzed using zero and first order kinetic models. In general, emulsions destabilized with time and followed the first order kinetic model. The destabilization rates of emulsions in the presence of emulsifier mixture would decrease by approximately 25-50% as compared to the destabilization rates of emulsions in the presence of lecithin or bio-silica as their sole emulsifier. Variations of lecithin and bio-silica concentrations in the emulsifier mixtures were not significant to the O/W emulsions stabilization. Furthermore, destabilization rate constants of O/W emulsions stored at the refrigerated temperature were ~2 times lower than those stored at room temperature.]]>
