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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 2 (2009)" : 6 Documents clear
Treatment of Wastewater Containing Wood Waste Pyroligneous Acid Preservative by Activated Carbon in Rubberwood Manufacturing Process Rizafizah Othaman; Agus Susilo; Hiroaki Habaki; Ryuichi Egashira
ASEAN Journal of Chemical Engineering Vol 9, No 2 (2009)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (276.866 KB) | DOI: 10.22146/ajche.50100

Abstract

In this paper, the feasibility of using the products from thermal treatment of rubberwood waste, i.e., pyroligneous acid as preservative and activated carbon as adsorbent to treat the wastewater containing the preservative was studied. Firstly, the sawdust was thermally treated under various conditions to produce the pyroligneous acid and the activated carbon. Atmosphere and treatment temperature were a significant factor in determining the yield of the products. Secondly, the equilibrium adsorption runs were carried out with the model wastewater containing single, multi solutes, or the pyroligneous acid and with the activated carbon obtained under steam atmosphere. Phenolic compounds were adsorbed at the highest in single solute solutions, and lower in multi solutes solutions. Finally, the feasibility of this process improvement was discussed.
A Hybrid Approach to Reconstruct a Complete TBP Curve from Blended Gas Condensates M Shuhaimi; M.R Naim
ASEAN Journal of Chemical Engineering Vol 9, No 2 (2009)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (608.398 KB) | DOI: 10.22146/ajche.50101

Abstract

Successful operations of a natural gas condensate fractionation unit requires the feed’s True Boiling Point (TBP) curve to be reconstructed and its’ bulk properties to be predicted. In this work, a hybrid approach combining the Generalised Distribution Model (GDM) and Pseudo-component Linear Equation (PcLE) methods are proposed. The proposed method is simple and requires limited information from readily available laboratory analysis data. The method was demonstrated using a refinery case study and found that the hybrid approach were able to reconstruct a pure component TBP curve from the blended feed data with error of less than 5%. Consequently the approach is very useful during preliminary stage for refinery engineers to explore and exploit the operational flexibility in a current distillation column to maximise the desired product yields.
Effect of Ca Ion Exchanged to the CO2 Adsorption on HZSM-5 Zeolites Sang Kompiang Wirawan
ASEAN Journal of Chemical Engineering Vol 9, No 2 (2009)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ajche.50102

Abstract

The adsorption behavior of CO2 on HZSM-5 and CaZSM-5 zeolites was investigated by a step change response method. Temperature programmed desorption (TPD) and in-situ fourier transform infrared (FTIR) spectroscopy were also performed to study the type of adsorbed species and their thermal stabilities. The adsorption experiments were carried out at temperatures from 323 to 473 K and CO2 partial pressures were below atmospheric pressure. The results indicated that CO2 was adsorbed on HZSM-5 by one type of adsorption, and on CaZSM-5 zeolites by at least two types of adsorption over the temperature range studied. One was a weak adsorption probably due to interaction with the framework of ZSM-5, and the other was a stronger adsorption caused by interactions with the Ca cations of ZSM-5. The adsorption behavior for HZSM-5 was adequately described by a single site Langmuir adsorption model but for CaZSM-5 a dual site Langmuir model was required. FTIR-spectra at various elevated desorption temperatures after adsorption of CO2 at low temperature revealed that CO2 was adsorbed on HZSM-5 and CaZSM-5 in several ways and formed carbonate bands, which seemed to be caused by different adsorption sites. The maximum temperatures at which carbonate species were observed were 573 K for HZSM-5 and 673 K for CaZSM-5. The TPD results indicated that the quantity of irreversibly adsorbed CO2 on HZSM-5 was undetectable.
Photolysis Reaction of Linear Alkhylbenzene Sulphonate in Saturated Soil: Kinetics Parameters Evaluation Edia Rahayuningsih; I Made Bendiyasa; B Radjagukguk
ASEAN Journal of Chemical Engineering Vol 9, No 2 (2009)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1277.498 KB) | DOI: 10.22146/ajche.50103

Abstract

Fate of detergent of linear alkhylbenzene sulphonate (LAS) in the soil can be described if the values of kinetics parameters are known. The objectives of the study were to determine the kinetics parameters of photolysis reaction of LAS in saturated soil system, to identify variables affecting the parameters, and to set-up empirical equations correlating parameter to the pertinent variables. The experimental works were performed in batch reactor which was equipped with ultraviolet of 53 or 789 lumens. One hundred grams of soil was mixed with 1000 ml of water and then the mixture was left for 24 hour in the reactor. A certain amount of LAS was then added to the soil solution and stirrer was put on, so that the LAS concentration in the mixture became 20 ppm. Before the light put on, the soil solution was analyzed its biomass content using a plate count method and LAS concentration using Methylene Blue Active Substances (MBAS) method. Subsequently the slurry were stirred and lighted continuously. At a certain time interval, 5 cubic centimeters of solution was taken from the reactor then its biomass content and LAS concentration were analyzed. The variables studied were different soil type and the light intensity. When effects of one variable studied, the other variables were kept constant.Photolysis reaction of LAS in saturated soil took place both in soil solution and particle. The kinetics parameters are the function of soil organic matter (%OM) and clay mineral (%CM) content, as well as light intensity. The photolysis reaction rate constants of LAS in soil solution and particle for light intensity of 53 lumens are described as follows:kPS = 3.79 x 10 -4 (%OM) + 4.41 x 10 -3 (%CM) kPL = 7.73 x 10 -3 (%OM) + 1.18 x 10 -3 (%CM) For the light intensity of 789 lumens, the kinetics parameters are kPS = 16.3 x 10 -4 (%OM) + 0.075 x 10 -3 (%CM) 30 Photolysis Reaction of Linear Alkhylbenzene Sulphonate in Saturated Soil: Kinetics Parameters Evaluation kPL = 49.3 x 10 -3 (%OM) + 1.46 x 10 -3 (%CM) kd = 8.06 x 10 -4 (%OM) + 7.39 x 10 -5 (%CM)
Second Generation of Biodiesel Production from Indonesian Jatropha Oil by Continuous Reactive Distillation Process Arief Budiman; Ratna D Kusumaningtyas; Sutijan Sutijan; Rochmadi Rochmadi; Suryo Purwono
ASEAN Journal of Chemical Engineering Vol 9, No 2 (2009)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (324.709 KB) | DOI: 10.22146/ajche.50104

Abstract

The batch process of biodiesel production deals with problems related to the labor and separation cost since it is slow, entailing several separation steps, labor intensive, and not suitable for a very large-scale production. Therefore, a second generation process technology for biodiesel should be developed. In this work, a continuous transesterification using reactive distillation was proposed. The goal was to bring in a more efficient reactor system by combining chemical reactions and separation simultaneously in one unit. In this work, a laboratory-scale Reactive Distillation was applied for the biodiesel synthesis from the Indonesian refined jatropha oil in the presence of NaOH catalyst. The experimental investigation demonstrated the effects of the temperature, catalyst loading, and molar ratio of the reactants. The best result was achieved on the process conducted at the reaction temperature of 65 ºC with molar ratio of methanol to triglycerides of 10:1 and catalyst loading of 0.75% w/ w oil. The reaction conversion was 94.83% and methyl ester content of the product was 99.27%. The fuel characteristic of biodiesel agreed with the Indonesian national standard and ASTM specification.
Kinetics of Ferrous Sulfate Catalytic Oxidation from Dissolved Iron Waste in Sulfuric Acid Hary Sulistyo; Suprihastuti Sri Rahayu; Wahyudi Budi Sediawan; Sarto Sarto; Takdir Syarif
ASEAN Journal of Chemical Engineering Vol 9, No 2 (2009)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (198.954 KB) | DOI: 10.22146/ajche.50105

Abstract

Iron waste was dissolved in a sulfuric acid to form a concentrated FeSO4- H2SO4 solution This research was conducted by catalytic oxidation of ferrous sulfate using manganese dioxide as catalyst to form a ferric sulfate. Catalytic oxidation reaction using a catalyst of manganese dioxide is a three phase heterogeneous reaction. This reaction kinetics is quite complex. This study aims to develop a mathematical modeling of reaction kinetics for three phases, gas, liquid and solid. Oxidation was undertaken on the condition of isothermal and isobaric in the threeneck flask as reactor. Experiment was run in the temperature range of 313 K to 363 K and catalyst concentration of 4.16 10 -3 gL-1 to 25 10 -3 gL-1.Results indicated that the oxidation rate increased with the increase of temperature and catalyst concentration. Reaction kinetics can be approached with quasi steady state model and chemical reactions on the surface of the catalyst are a step controls the reaction kinetics. The relation between reaction rate constant and temperature in the following Arrhenius form:kR = 2182exp (-17613/RT),L g.eq-1min-1 Manganese dioxide as catalyst can increase a reaction rate and reduce the activated energy which can be expressed in the following equation E = 20129.025exp(-0.0472mk),Jmol-1 Activated energy was found from 14414 Jmol-1to 19747 Jmol-1 and maximum ferrous sulfate conversion was of 97.20%. Those values were similar result with the literature available.

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