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ASEAN Journal of Chemical Engineering

AJChE
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Published by Universitas Gadjah Mada

ISSN : 26555409 EISSN : 26555409 DOI : https://doi.org/10.22146/ajche.52004

Core Subject : Science, Engineering,

Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry

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

Arjuna Subject : Teknik Kimia (semua kategori) - Kimia Proses dan Teknologi

Articles 372 Documents

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Preliminary Study: Kinetics of Oil Extraction from Sandalwood by Microwave-assisted Hydrodistillation Heri Septya Kusuma; Mahfud Mahfud
ASEAN Journal of Chemical Engineering Vol 15, No 2 (2015)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Sandalwood and its oil, is one of the oldest known perfume materials and has a long history (more than 4000 years) of use as mentioned in Sanskrit manuscripts. Sandalwood oil plays an important role as an export commodity in many countries and its widely used in the food, perfumery and pharmaceuticals industries. The aim of this study is to know and verify the kinetics and mechanism of microwave-assisted hydrodistillation of sandalwood based on a second-order model. In this study, microwave-assisted hydrodistillation is used to extract essential oils from sandalwood. The extraction was carried out in ten extraction cycles of 15 min to 2.5 hours. The initial extraction rate, the extraction capacity and the second-order extraction rate constant were calculated using the model. Kinetics of oil extraction from sandalwood by microwave-assisted hydrodistillation proved that the extraction process was based on the second-order extraction model as the experimentally done in three different steps. The initial extraction rate, h, was 0.0232 g L-1 min-1, the extraction capacity, CS, was 0.6015 g L-1, the second-order extraction rate constant, k, was 0.0642 L g-1 min-1 and coefficient of determination, R2, was 0.9597.

Optimization of Nanobubble-Assisted Bunker Oil Flotation from Oil-Wet Sand via Response Surface Methodology (RSM) Lim Mee Wei; Lau Ee Von; Poh Phaik Eong
ASEAN Journal of Chemical Engineering Vol 15, No 1 (2015)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Flotation technology is an effective method for the separation of oil from sand via gas-liquid-solid system. The mechanism of flotation lies in the generation of gas bubble that attaches itself to the hydrophobic particles. Therefore, one of the main parameters which could affect the efficiency of flotation is the bubble size distribution. This research aims to investigate the efficiency of nanobubbles (NBs) in the flotation process to remove high density bunker oil from oil/sand slurry in a laboratory-scale flotation cell. Experiments were carried out using NBs (approximate diameter of 200 nm) generated via ultrasonication for the flotation studies. In this investigation, four different variables including amplitude (sonication power), pH, duration of sonication (min) and input flowrate of NBs (ml/s) were studied. The second order response function was used for obtaining flotation efficiency, and was further optimized using response surface methodology (RSM) to maximize flotation efficiency within the experimentally studied range. The optimum parameters were found to be, 70% amplitude, pH 12, 10 min of flotation and an input flowrate of 57 ml/s to achieve the predicted maximum flotation efficiency of 19.83%. This was in agreement to the experimental results which show an optimum flotation efficiency of 19.98%. The test results indicated that the use of NBs alone provided unsatisfactory flotation. Even though NBs (larger surface area) are expected to increase the bubble-particle attachment and decrease the detachment probabilities, the low buoyancy/low rising velocity of NBs prevents efficient flotation despite the advantages they have. Future studies would include the optimization of bubble size to improve the flotation efficiency

A New Approach of Thin Coated Adsorbent Layer for Batch Adsorption Using Basic Dye S.F. Azha; A.L. Ahmad; S. Ismail
ASEAN Journal of Chemical Engineering Vol 15, No 1 (2015)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Clay based adsorbent which formulated to acts as thin coated adsorbent layer (TCAL) is a new approach for adsorption of coloured wastewater. In this study, TCAL has been evaluated for the removal of methylene blue dye as an adsorbate from aqueous solution. It was prepared by combination formula of commonly known clay based adsorbent, a binder as well as solvent. This paper focused on evaluation of TCAL in terms of performance including effects of different types of binder used and ratio of adsorbent to binder. The study effect on ratio was targeted for its coating strength, contact time as well as percentage dye removal. The experimental data reported that the water based binder was the most suitable binder to be used in TCAL in terms of adsorption performance and gave strength to the coating adsorbent itself. The optimum ratio of adsorbent to binder is 0.3/2.5 weight mass. The percentage removal test for 100 mg/L concentration of Methylene Blue in batch adsorption of adsorbent coating layer was found to achieve 100 % removal within less than 3 hours. Elemental analysis and morphological structure were also determined. The finding revealed the potential of TCAL as an effective adsorbent for undertaken adsorption process on basic dye.

Preparation and Characterization of Activated Carbon from the Sea Mango (Cerbera Odollam) with Impregnation in Phosphoric Acid (H3PO4) A. Nur Hidayah; M.A. Umi Fazara; Z. Nor Fauziah; M.K. Aroua
ASEAN Journal of Chemical Engineering Vol 15, No 1 (2015)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

The properties of the activated carbon from Sea Mango (Cerbera Odollam) prepared from chemical and physical activation was studied. The sample was impregnated with phosphoric acid (H3PO4) at the impregnation ratio of precursor to activant as 1:2 and followed by thermal activation at 500 °C with different flowing gas i.e. nitrogen (N2), carbon dioxide (CO2), steam and at the absent of any gases for duration of 2 hours. The sample experienced two different steps of preparation which were Method 1 and Method 2. In Method 1, the precursor will be thermally heated after the chemical activation process, and the samples were denoted as RIHM1-N, RIHM1-CO2, RIHM1-S and RIHM1-A which utilize either N2, CO2, steam and absent of any gases, respectively. Meanwhile in Method 2, the carbonization process with N2 flow at 200 °C was done prior to chemical and thermal activation. This type of treatment method was denoted as RCIHM2-N, RCIHM2-CO2 RCIHM2-S and RCIHM2-A, which use the same flowing gases as described previously. The surface area of the activated carbon was determined using standard method (ASTM) of iodine test. A higher iodine number reading was given by the sample prepared via Method 2 i.e. 1021.74 mg/g, 1069.98 mg/g 902.40 mg/g and 1040.58 mg/g for sample RCIHM2-N, RCIHM2-CO2, RCIHM2-S and RCIHM2-A, respectively. For sample prepared via Method 1, the iodine number measurement for sample RIHM1-N, RIHM1-CO2, RIHM1-S and RIHM1-A were 896.480 mg/g, 810.900 mg/g, 973.70 mg/g and 856.217mg/g, respectively.

Forward Osmosis: Temperature Effects By Using Pome as Feed Solution Hanizah Arifin; Thomas S.Y. Choong; Chan Kam Rong; Fakhru'l Al-Razi Ahmadun; Luqman Chuah Abdullah
ASEAN Journal of Chemical Engineering Vol 15, No 1 (2015)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Forward osmosis (FO) has recently been considered as one of the promising technologies for low energy applications. Factors that influence FO performance are draw solution, types of membrane, membrane orientation, cross flow velocity, module configuration and temperature effect. In this study, the influence of temperature on the performance of FO process has been studied in terms of water flux by using raw POME as feed solution. A higher temperature creates a higher water fluxes at various draw solution concentrations. Percentages of water flux increments for raw POME are between 7% to 9% from 25ºC to 35ºC and 32% to 75% from 25ºC to 45ºC.

Preliminary Study on Extraction of Bio-flocculants from Okra and Chinese Yam Chai Siah Lee; Mei Fong Chong; John Robinson; Eleanor Binner
ASEAN Journal of Chemical Engineering Vol 15, No 1 (2015)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Natural bio-flocculants were extracted from okra and Chinese yam using water extraction method, and the extract yield and their flocculating abilities were evaluated. Results showed that extraction of okra with seed removal and incubation followed by freeze drying enhanced the extract yield by 91% and improved the flocculating ability greatly by achieving solids removal of above 99% when compared with extraction without incubation and followed by oven drying. The effect of an incubation step was further investigated by using Chinese yam. With incubation, a higher extract yield of 2.95% was obtained compared with the extraction without incubation at 2.13% and high flocculating ability was achieved at 99.5% solids removal. To further investigate the application of bio-flocculants, the samples with the highest extract yield and flocculating ability were selected for a case study focusing on treatment of oleochemical wastewater. Yam bio-flocculant showed its flocculating activity with 80% solids removal when it was coupled with coagulant without pH alteration. However, pH adjustment was required for okra bio-flocculant. In conclusion, highly efficient okra and yam bio-flocculants were successfully extracted and their applicability to wastewater treatment was proven.

A Skeletal Kinetic Model For Biodiesel Fuels Surrogate Blend Under Diesel-Engine Conditions Chit Wityi Oo; Masahiro Shioji; Hiroshi Kawanabe; Susan A. Roces; Nathaniel P. Dugos
ASEAN Journal of Chemical Engineering Vol 15, No 1 (2015)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

The biodiesel surrogate fuels are realistic kinetic tools to study the combustion of actual biodiesel fuels in diesel engines. The knowledge of fuel chemistry aids in the development of combustion modeling. In order to numerically simulate the diesel combustion, it is necessary to construct a compact reaction model for describing the chemical reaction. This study developed a skeletal kinetic model of methyl decanoate (MD) and n-heptane as a biodiesel surrogate blend for the chemical combustion reactions. The skeletal kinetic model is simply composed of 45 chemical species and 74 reactions based on the full kinetic models which have been developed by Lawrance Livermore National Laboratory (LLNL) and Knowledge-basing Utilities for Complex Reaction Systems (KUCRS) under the diesel like engine conditions. The model in this study is generated by using CHEMKIN and then it is used to produce the ignition delay data and the related chemical species. The model predicted good reasonable agreement for the ignition delays and most of the reaction products at various conditions. The chemical species are well reproduced by this skeletal kinetic model while the good temperature dependency is found under constant pressure conditions 2MPa and 4MPa. The ignition delay time of present model is slightly shorter than the full kinetic model near negative temperature coefficient (NTC) regime. This skeletal model can provide the chemical kinetics to apply in the simulation codes for diesel-engine combustion.

Role of Citric Acid Modification on Hydrodesulfurization of DBT and 4,6 DMDBT in the Presence of Pyridine Over CoMo/Al2O3 Pawinee Sintarako; Piyasan Praserthdam; Vivan Thammongkol; Banpot Pokacharoenwatjana; Watchara Yuanglamyai; Chattrapha Inthiwong
ASEAN Journal of Chemical Engineering Vol 15, No 1 (2015)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

In this study, the effect of pyridine as a basic nitrogen compound on HDS activity of DBT and 4,6 DMDBT in treated diesel over modified CoMo/Al2O3 by citric acid has been investigated. It has been obviously found that the modification of CoMo/Al2O3 catalyst by citric acid can inhibit the influence of pyridine on HDS activity of DBT and 4,6 DMDBT. This can be explained that when citric acid was applied in the catalyst preparation, the increasing of total amount of acid sites and the enhancement of HDN activity play an important role in the tolerance of pyridine.

Multicriterial Analysis of Simulated Process of Post-Combustion Capture of Pure H2S and Mixtures of H2S and CO2 Using Single and Blended Aqueous Alkanolamines Allan N. Soriano; Adonis P. Adornado; Angelica A. Pajinag; Diana Joy F. Acosta; Niel M. Averion; Gilfred M. Leron; Vergel C. Bungay
ASEAN Journal of Chemical Engineering Vol 15, No 1 (2015)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

The paper evaluates the performance of the nine selected alkanolamines, namely, monoethanolamine (MEA), diethanolamine (DEA), monomethylethanolamine (MMEA), aminoethylethanolamine (AEEA), diisopropanolamine (DIPA), triethanolamine (TEA), dimethylethanolamine (DMEA), N-methyldiethanolamine (MDEA), and piperazine (PZ) for post-combustion capture of pure hydrogen sulfide (H2S) and mixtures of hydrogen sulfide and carbon dioxide (CO2) at different solvent mass flows: 500, 750, and 1000 kg/h using Aspen Plus® Version 7.2. The objective of the paper is to select the best chemical absorbent for each different criterion: percent H2S removal, percent H2S solvent carrying capacity, percent H2S retained in the lean solvent, percent CO2 and H2S removal, percent CO2 and H2S solvent carrying capacity, percent CO2 and H2S retained in the lean solvent. Based from the obtained results, piperazine is an absorbent that has a good potential for use as a single amine or in mixtures with other amines for capture of pure H2S and mixtures of H2S and CO2.

Stability and Emission Characteristics of Diesel-Ethanol-Coconut Methyl Ester Blends for the Diesel Engines Tanti Ardiyati; Nathaniel P. Dugos; Susan A. Roces; Masaaki Suzuki; Kusnanto Kusnanto
ASEAN Journal of Chemical Engineering Vol 14, No 2 (2014)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

The stability and emission characteristics of diesel-ethanol-coconut methyl ester (CME) blends were studied to determine the most suitable fuel blends to be applied in diesel engines. This is done in order to assess the potential of the blends as a substitute for commercially available diesel fuel used in diesel engine. The stability results of the blends using 100% and 99.5% ethanol purity showed that the fuel blends containing ethanol up to 10% and CME of 5% and greater exhibited high mutual solubility at any temperature range and were resistant to microbial growths after 3 months storage. Engine operations at low speed especially at idle-no load and using a bigger size engine lead to a minimum ignition delay and result in lower fuel consumption rate. The emission test results with the new- blended fuels showed a reduction in CO2 and increasing percentage by volume of CO2 compared to commercially available diesel. The blends could deliver an efficient combustion and could run efficiently since production of the CO2 gases is higher than that of CO. The blends of 80% diesel, 5% ethanol, 10% CME; and 80% diesel, 10% ethanol, 10% CME could reduce the smoke opacity compared to commercially available diesel.

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Contact Name
Ari Pramudyantoro

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ajche.ft@ugm.ac.id

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+62274555320

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ajche.ft@ugm.ac.id

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Jln. Grafika No. 2 Kampus UGM Yogyakarta Indonesia 55281

Location
Kab. sleman,

Daerah istimewa yogyakarta

INDONESIA

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Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

Contact Name Ari Pramudyantoro

Contact Email ajche.ft@ugm.ac.id

Phone +62274555320

Journal Mail Official ajche.ft@ugm.ac.id

Editorial Address Jln. Grafika No. 2 Kampus UGM Yogyakarta Indonesia 55281

Location Kab. sleman, Daerah istimewa yogyakarta INDONESIA

Abstract

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Abstract

Contact Name
Ari Pramudyantoro

Contact Email
ajche.ft@ugm.ac.id

Phone
+62274555320

Journal Mail Official
ajche.ft@ugm.ac.id

Editorial Address
Jln. Grafika No. 2 Kampus UGM Yogyakarta Indonesia 55281

Location
Kab. sleman,

Daerah istimewa yogyakarta

INDONESIA