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ASEAN Journal of Chemical Engineering
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 6 Documents
 1 
Search results for , issue "Vol 9, No 1 (2009)" : 6 Documents clear
H2-poor bio-syngas in Fischer-Tropsch synthesis over un-promoted and rhenium promoted alumina-supported cobalt catalysts: Effect of water addition Dewi Tristantini; Borje Gevert
ASEAN Journal of Chemical Engineering Vol 9, No 1 (2009)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (347.086 KB) | DOI: 10.22146/ajche.50106

Abstract

The effect of water addition on Fischer-Tropsch synthesis (FTS) over 12%Co/Al2O3 and 12%Co-0.5%Re/Al2O3 catalysts was investigated in a fixed bed reactor with model mixtures of biomass-derived syngas (bio-syngas). The bio-syngas model mixtures consist of H2 and CO of different molar H2/CO-ratios (1.0, 1.5 and 2.1). The FT-reaction requires a H2/CO molar ratio of approximately 2.1 above the catalyst surface. For the ratios lower than 2.1, an in situ water-gas shift (WGS) activity is desired in order to increase the H2/CO-ratio. However, the studied catalysts had quite low WGS activities. The addition of water slightly increased the WGS activity for all types of bio-syngases and for both catalysts. The highest WGS activity was found for the un-promoted Co-catalyst at the inlet H2/CO-ratio = 1.0. Water addition also results in an increase in selectivity to C5+ and a decrease in selectivity to CH4 . Interestingly, for both of catalysts the selectivity to C5+ and CH4 were rather similar for inlet H2/CO-ratios of 2.1 and 1.5, while the highest selectivity to C5+ and the lowest selectivity to CH4 were also found for the inlet ratio = 1.0. All catalysts were deactivated by water addition but the catalyst activity is partly recovered in H2/CO-ratio inlets = 1.0 and 1.5. The Co/Al2O3 was affected by water more severely in H2/CO ratios = 2.1. The Re-promoted Co catalyst was considerably more active and selective to longer hydrocarbons than the un- promoted one. The conclusion of this study is that in order to utilize the advantages of a bio-syngas with a low H2 content (higher selectivity to C5+, lower selectivity to CH4, no WGS-unit needed prior to FT-reactor), the catalyst must possess a much higher WGS activity than the ones studied.
Regeneration, MDA, Mo carbide, zeolite, aromatic, coke Chandra Mohan Sinnathambi
ASEAN Journal of Chemical Engineering Vol 9, No 1 (2009)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (87.773 KB) | DOI: 10.22146/ajche.50107

Abstract

Methane dehydro-aromatization (MDA) is a one-step conversion of methane to aromatics under non-oxidative condition in the presence of Mo-modified HZSM-5. The main drawback of MDA reaction is the rapid deactivation of the Mo carbide catalyst by coking. For catalyst stability and efficiency, a suitable and economical catalytic regeneration system is necessary. The present study investigates the regainability of catalyst activity by in-situ regeneration of spent 3wt% -Mo/HZSM-5 catalyst in air. Encouraging results is observed when 5% oxygen at a GHSV of 4800h-1 over 1 hour was used. The main drawback is coke is favored over aromatic product.
One Dimensional Mathematical Model of Re-Ignition Characteristics Tri Poespowati
ASEAN Journal of Chemical Engineering Vol 9, No 1 (2009)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1616.334 KB) | DOI: 10.22146/ajche.50108

Abstract

Re-ignition of a wood-based object essentially comprises three overlapping phases; these are the heat-up phase, the extinguishment phase, and the re-heat-up phase. A one-dimensional mathematical model was developed in this study to simulate multiple consecutive ignitions associated with re-ignition process within a porous material. The model focuses on the treatment of heat transfer in porous media that is assumed to be one-dimensional within a homogeneous sample. The effect of porosity is incorporated through the inclusion of an effective thermal conductivity. Our experience indicates that the ignition temperatures and ignition delay times obtained from this approach are in good agreement with relevant experimental data.
Influence of Oxygenation on Granulation in Anaerobic Wastewater Treatment Soeprijanto Soeprijanto; K. Brighton
ASEAN Journal of Chemical Engineering Vol 9, No 1 (2009)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1484.279 KB) | DOI: 10.22146/ajche.50109

Abstract

The emphasis of this study was to put on the ability of bacteria to form granules in anaerobic wastewater treatment. This direction was taken mostly because the success of wastewater treatment in such systems as Upflow Anaerobic Sludge Blanket (UASB) depends on how long the biomass is retained, and this is a function of adhesion of bacteria to reach other to form well-settling granular sludge. The granular sludge will remain in the reactor and will be exposed to the continuous supply of nutrients (wastewater) which is injected into it. The wastewater used in this study was synthetic. It consisted of molasses dissolved in water (100%), and a mixture of molasses and peptone dissolved in water (20 % and 80 %, respectively). Several factors or parameters influence bacteria to form good granules and improve the performance of the digesters. The effects of oxygen on the anaerobes, and the extent to which it acts as an inhibitor or toxic was studied. This was found to be both advantageous and disadvantageous.
Mathematical Model and Advance Control for Activated Sludge Process in Sequencing Batch Reactor Ahmmed S Ibrehem; Mohamed Azlan Hussain
ASEAN Journal of Chemical Engineering Vol 9, No 1 (2009)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (463.639 KB) | DOI: 10.22146/ajche.50110

Abstract

This paper presents the results of a modeling and simulation study of an activated sludge process in a sequencing batch reactor (SBR), with emphasis on total nitrogen removal. This study focuses on the effect of dissolved oxygen (DO) and effluent chemical oxygen demand (COD). Neural-network based redictive controller (MPC) is implemented to control the system for the DO set point and give better and acceptable results when compared with the conventional PID controller
Kinetics of Mass Transfer, Colour, Total Polyphenol and Texture Change of Manilkara Zapota During Convective Air Drying Chien Wha Chong; Chung Lim Law; Michael Wha Cloke; Luqman Chuah Abdullah; Wan Ramli Wan Daud
ASEAN Journal of Chemical Engineering Vol 9, No 1 (2009)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3218.645 KB) | DOI: 10.22146/ajche.50111

Abstract

The effects of air temperature and product size on drying kinetics, retained total polyphenol content (TPC), hardness kinetics and total colour change (.E) kinetics of ciku (Manilkara zapota) were investigated. In addition, five terms of the theoretical model were used to estimate the effective diffusivity values during drying at temperatures from40OC to 70OC. The drying rates of dried ciku were increased with increasing temperature and decreasing product size. It was found that hardness of ciku dried at temperature higher than 60OC increased significantly, when the moisture content was reduced toless than 0.5 g H2O/g DM (dry basis). In terms of nutritional value, the retained total polyphenol content (TPC) of dried ciku in hot air drying also increasing with temperature. The highest retained TPC was 141 mg GAE/ 100g of samples, which can be obtained from drying at 70OC.

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