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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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Influence of Ethanol Concentration and Template Ion Exchange Agent on Template Recycling in Mobil Crystalline Material 41 (MCM-41) Synthesis Jia Yen Lai; Lock Hei Ngu; Farouq Twaiq
ASEAN Journal of Chemical Engineering Vol 19, No 2 (2019)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Recycling of surfactant template for several subsequent MCM-41 synthesis is necessary to reduce substantial synthesis solution disposal. In MCM-41 synthesis, ethanol concentration and template ion exchange agent are two significant factors that affect the silicate polymerization, solvating effect on micelles formation, and MCM-41 mesostructure formation. In view of that, this study investigates recycling of surfactant template ions in extract solution in Mobil Crystalline Material 41 (MCM-41) synthesis. Effect of the ethanol concentrations in the solution gel and the types of ion exchange agents on the yield of MCM-41 material and its surface morphology were studied. Hexadecyltrimethylammonium bromide was used as template for MCM-41 synthesis using tetraethylorthosilicate (TEOS) as silica reagent with ethanol-water mixture as solvent at different ethanol concentrations. Template ions of synthesis gel was exchanged with an ion exchange agent (i.e., 1-butyl-3-methylimidazolium chloride or ammonium nitrate) before it is extracted using synthesis solution. After extraction, the extracting solution was added with TEOS, used for second synthesis cycle and the process continued in an extraction. The template ions in the extract solution were further recycled up to eight synthesis cycles. Yield of calcined materials significantly influenced by ethanol solvent concentrations and however did not vary with various ion exchange agents. Nitrogen adsorption isotherms showed that the calcined materials exhibit MCM-41 characteristics with surface areas ranging from 600 – 1000 m2/g. It is possible to recycle and reuse the surfactant template for several subsequent times of preparing MCM-41 if the ethanol concentration in the solution gel controlled continuously.

From the Regional Symposium to Our Own Journal Publication:Forthe SoundDevelopmem of ChemicalEngineering in ASEAN Hiroo Niiyama
ASEAN Journal of Chemical Engineering Vol 1, No 1 (2001)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Regional symposium on Chemical Engil.1eeringwas first held in 1994 in Manila, Philippines. Since then, the symposium has developed quite significantly in terms of publishing papers in the said field. However, any development stagnates if scholars do not make effortsto further improve the present system. This paper analyzes such underlying problems in the academic community of different regions. Based on these problems, the ad hoc preparatory committee hence sees the need to propose the foundation of a Chemical Engineering Journal.

Overview Petrochemical Based Industries in Malaysia Mohamad Rojl Sarmldi; Ramlan Aziz; Mohammed Azlan Hussain; Wan Ramli Wan Daud
ASEAN Journal of Chemical Engineering Vol 1, No 1 (2001)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

This paper describes the current status of the petrochemical industry in Malaysia. The industry is broadly categorized into various sector that include the agrochemical and agroprocessing, basic chemicals, industrial gases, oleochemical, petrochemical, surface coatings, and the fine chemicalssector. With regard to industrial development, Malaysia has adopted the Manufacturing strategy and clustering concept for the manufacturing based industry. The main idea is to develop the chemical industry in the form of an industrial clusterwhere industrial symbiosis could tloulish and achieve the national objectives within the next ten years or so. The focus of the paper is, however, on the resource based processing and petrochemical industry in particular.

natural Gas Reform Policies for the Deyelopment of Indonesian Chemichal and Petrochemical Industries:Proposals and Recommendations Triharyo l. Soesilo; Fazi'et Maskan
ASEAN Journal of Chemical Engineering Vol 1, No 1 (2001)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

In industrialized nations, natural gas is not only used as an energy source but also as a raw material for the chemical and petrochemical industries. Indonesia, one of the largest producers of natural gas, uses only less than 8% of the gas produced for its chemical and petrochemical industries. By increasing the amount of gas used as feedstock for chemical and petrochemical industries, Indonesia will generate more income for the government and provide employment. To do this, however, current Indonesian government policy on natural gas production needs to be reformed. This paper outlines an across-the-board reform policy on natural gas with the objective of optimizing the natural gas usage of the chemical and petrochemical industries.

The Development of Chemical Industries In the Philippine Dr. Servillano S.B. Olano, Jr.
ASEAN Journal of Chemical Engineering Vol 1, No 1 (2001)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ajche.50794

This paper attempts to briefly describe the development and state of the chemical industry in the Philippines by presenting related information reported by government agencies and practitioners specificallyby the Chemical Industries Association in the Philippines.The informationcan help describethe weaknesses,problems, development aspects, prospects, and strengths of the industry. Hopefully, with the current development and the new and vigorous thrust of the government and private sector, trends for the coming years will be bright for the chemical industry and the industrialization of the country as a whole.

Economic Crisis and Its Impact:Chemical industry in Thailand Dr. Pailin Chuchottaworn
ASEAN Journal of Chemical Engineering Vol 1, No 1 (2001)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

The economic crisisthat started in Thailand since July 2, 1997 has escalated into a contagious global recession in 1998. ASEAN including Korea were probably among the hardest hit economies under the crisis. [t was generally believed that the crisis was caused by lack of discipline among the private sector and outdated financial infrastructure in view of rapid and accelerated market liberalization. From the chemical industry viewpoint, the industry plays a critical role in propelling industrialization effort in Thailand. The industry, along with steel and cement industries,serves as the three main pillarsfor furtherdevelopments of other downstream manufacturing industries such as auto. electronics, home appliances, etc. Chemical industry in precrisis era used to enjoy a good GDP annualiz!;!d average growth rate of around 20 percent. With an aggressive growth rate for long period. the industry, along with Thai economy, face, peril in the 1997 crisis. The crisis effectively sets-back local demand by 3 years and forces the industry to reexamine its position and strategy for a more stable and sustainable growth in next millennium. The crisisrenders a costly check and balance tools for developing economies in ASEAN to strictly maintaining fine balance and harmony in all facets of developments, industrial,human, legaland moral framework, etc. From various macroeconomic indicies announced recently, Thai economy is on the path of recovery. Local demands along with the export of chemical products have improved in the firsthalf of 1999 and the tendency for the second half is rather promising.

Rotating Biological Contactor for Biological Treatment of Poultry Processing Plant Wastewater Using Saccharomyces Cerevisiae Dr. Gashem Najafpour; Punita Nook Naidu; Azlina Harun Kamaruddin
ASEAN Journal of Chemical Engineering Vol 2, No 1 (2002)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Biological treatment using attached growth on a rotating biological contactor(RBC) was implemented for wastewater from poultry industries, which containsa high level of organic compounds due to the slaughtering, rendering of bonesand fats, and plucking processes. The wastewater mostly consists of proteins,blood, fat and feathers. Nutrients available in the wastewater may enhance thegrowth of microorganisms, thus, it allows biological treatment to be usedeffectively. On the other hand, there are problems associated with biologicaltreatment processes such as nutrients promoting algae growth. The controlvariables for the attached growth in RBC were wastewater detention time, effectivesurface for attached growth, disc submerged level in the wastewater basin, shaftrotation for aeration, pH control and supplementary nutrients. The attachedgrowth resulted to high COD refPoval. The best treatment was obtained after 24hours with 29 % disc submergence level. The effective surface area for cellgrowth was 10.7 m2 using 60 discs mounted on a shaft. The microorganismused for the attached microbial growth was Saccharomyces cerevisiae. The shaftwas rotating at 11 rpm. The treatment was improved with the addition of 1 v/vof 0.1 molar sodium hydroxide solution to the wastewater for controlling pH. A91 % COD removal was obtained with RBC operating at optimum conditions,with a DO concentration of 3.98 mg/l.Key words: Rotating biological contactors, Aerobic treatment, Poultry processing wastewater,Saccharomyces cereuisiae,Attached growth.

Gas Holdup and Gas-Liquid Mass Transfer Investigations in an Oscillatory Flow in a Baffled Column Taslim Taslim; Mohd Sobri Takriff
ASEAN Journal of Chemical Engineering Vol 2, No 1 (2002)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Gas holdup and gas-liquid mass transfer were investigated in a vertical baffled column. Pure carbon dioxide (C02) was used as the dispersed phase and tap water was used as the continuous phase. Gas holdup and mass transfer rate of C02 were measured under semi-batch condition, while the liquid phase was measured in batch mode. Gas holdup was estimated as the volume fraction of the gas in the two-phase mixture in the column. Mass transfer was expressed in terms of the liquid-side volumetric mass transfer coefficient (kLa). The effects of oscillation frequency, oscillation amplitude and gas flow rate on gas holdup andmass transfer were also determined. The results showed that a significant increase in gas holdup and mass transfer could be achieved in an oscillatory baffled column compared to a bubble column. Gas holdup and mass transfer were correlated as a function of power density and superficial gas velocity. Keywords: gas holdup, mass transfer coefficient, power density, superficial gas velocity

Application 0f Draft Tube in the Reduction of Backmixing Rate in Oscillatory Flow in a Baffled Column Mohd Sobri Takriff; Zuhrina Masyitah
ASEAN Journal of Chemical Engineering Vol 2, No 1 (2002)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Oscillatory flow in a baffled tube/column is an efficient way to enhance mixing in a straight smooth column. However, liquid oscillation moving back and forth across the baffle causes backmixing which is a disadvantage when plug flow is desired. This paper presents results from a study conducted to reduce the backmixing rate in oscillatory flow in a baffled column with the use of a draft tube. Results of this study showed that backmixing increases with oscillation velocity and decreases with liquid flow rate. The use of a draft tube reduces backmixing. The backmixing reduction is proportional to the ratio of L/Do However, the draft tube can not be extended too long because it disrupts the flow behavior in the column and creates dead zones near the baffle region. The draft tube length is maximized by extending it to both sides of the baffle, provided that the L/De on each side of the baffle is at 0.67 or less.

Sensitivity Analysis of the Life-Cycle Inventories of Electricity and Hydrogen as Energy Vectors for the Philippine Automative Transport Sector Raymond R. Tan; Alvin B. Culaba
ASEAN Journal of Chemical Engineering Vol 2, No 1 (2002)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

The Philippine automotive transport sector accounts for a significant portion ofthe country's petroleum consumption and air emissions. Research in alternative fuels for road vehicles is thus an essential element in the country's long-term-electrical environmental management strategy. Two radical vehicle technologies propulsion systems and fuel hydrogen for fuel cells - are widely considered to be the most promising energy vectors from an environmental standpoint. Electric vehicles (EV) and fuel cell vehicles (FCV) are driven by electric motors; the former use electricity stored in batteries, while the latter generate electricity from the oxidation of hydrogen. Potentially, both electric power and fuel hydrogen can be sustainably produced using renewable energy sources, and their use in vehicles generates almost no direct pollution. However, life-cycle assessment (LCA) may reveal significant environmental impacts from the infrastructure required to produce and distribute these energy vectors on a commercial scale. This study quantifies the life-cycle air emissions and energy balances associated with the use of electricity and hydrogen for motor vehicle propulsion in order to determine which fuel offers more environmental benefits. The assessment uses a modified version of the GREET 1.Sa fuel cycle inventory model, with corrections made to account for Philippine conditions. Sensitivity analysis is performed in the model to determine the effect of marginal power generation mix and system transmission losses on the life-cycle inventories of both energy vectors. The results of the simulation indicate that for a given marginal power generation mix, there is no clear-cut advantage in terms of environmental performance for either hydrogen or electricity.

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Contact Name
Ari Pramudyantoro

Contact Email
ajche.ft@ugm.ac.id

Phone
+62274555320

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ajche.ft@ugm.ac.id

Editorial Address
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

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

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