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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 7 Documents

Search results for , issue "Vol 11, No 1 (2011)" : 7 Documents clear

Ink-jet printing for Plasma-treated Cotton Fabric with Biomaterial C.W. Kan; C.W.M. Yuen; W.Y. Tsoi; C.K. Chan
ASEAN Journal of Chemical Engineering Vol 11, No 1 (2011)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Currently, sodium alginate is commonly used for preparing the printing medium for digital ink-jet printing due to its ready solubility and excellent stability even at high-temperature fixation treatments. Similar to sodium alginate, chitosan is also widely used as novel biomaterial. As a natural polymer, sodium alginate and chitosan are biocompatible, biodegradable and non-toxic. Therefore, chitosan may be used as a chemical for preparing printing medium for digital ink-jet printing for cotton fabric. Recently, low temperature plasma (LTP) treatment has proved to be an effective pretreatment method for the improving coating process by altering the surface properties of the material without much changing of the bulk properties. Thus, the aim of this study was to investigate the possibility of applying LTP treatment as pretreatment process to enhance the coating of printing medium, i.e. sodium alginate and sodium alginate/chitosan mixture, so as to improve the final properties of the digital ink-jet printed cotton fabric.

Optimization of Pd Membrane Reactor for Direct Oxidation of Aromatic Compounds Milad Rasouli; Sahar Chitsazan; Mohammad Hossein Sayyar; Nakisa Yaghobi; Babak Bozorgi
ASEAN Journal of Chemical Engineering Vol 11, No 1 (2011)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Computational fluid dynamic has already become a widely used and indispensable design and optimization tool in many technical areas. In the present work, the CFD simulations have been coupled with complex chemical reactions to model a membrane tubular reactor which is used to produce phenol from benzene in the vapor phase. Hydrogen dissociates on the palladium layer and reacts with oxygen to give active oxygen species, which attack benzene to produce phenol. In principal, reaction occurs in the surface of palladium and conversion of benzene is increased by changing the length and diameter of the Pd coated PSS tubes. The reactor length and diameter are two geometrical factors which are concerned in the present study. Although increasing the reactor length increase the conversion of benzene to phenol but the concentration of the phenol start to decrease. Based on the data provided by the experiments, a mathematical model has been constructed to conduct a simulation which leads us to an optimum design of a new tubular membrane micro-reactor.

Two-degree-of-freedom Controller Design for Uncertain Processes Using Input/output Linearization Control Technique Pisit Sukkarnkha; Chanin Panjapornpon
ASEAN Journal of Chemical Engineering Vol 11, No 1 (2011)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

In this work, a new control method for uncertain processes is developed based on two-degree-of-freedom control structure. The setpoint tracking controller designed by input/output linearization technique is used to regulate the disturbance-free output and the disturbance rejection controller designed is designed by high-gain technique. The advantage of two-degree-of-freedom control structure is that setpoint tracking and load disturbance rejection controllers can be designed separately. Open-loop observer is applied to provide disturbance-free response for setpoint tracking controller. The process/disturbance-free model mismatches are fed to the disturbance rejection controller for reducing effect of disturbance. To evaluate the control performance, the proposed control method is applied through the example of a continuous stirred tank reactor with unmeasured input disturbances and random noise kinetic parametric uncertainties. The simulation results show that both types of disturbances can be effectively compensated by the proposed control method.

Recovery of Alcohol Ethoxylates Nonionic Surfactant using Co-Current Vacuum Stripping Suratsawadee Kungsanant; Sirinthip Kittisrisawai; Boonyarach Kitiyanan; Thirasak Rirksomboon; Somchai Osuwan; John F. Scamehorn
ASEAN Journal of Chemical Engineering Vol 11, No 1 (2011)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Cloud point extraction (CPE) has shown to be an effective technique to remove organic compounds from contaminated water using nonionic surfactant as a separating agent. To make this process more economically attractive, the spent nonionic surfactants should be recycled and reused. This work utilized a packed column operated under vacuum in co-current mode to remove the volatile organic compounds (VOCs) from the secondary alcohol ethoxylates, AEs, coacervate solution. The co-current operation can effectively avoid plugging, excessive foaming, and flooding. The selected volatile organic contaminants are aromatic hydrocarbons such as benzene, toluene, and ethylbenzene. The hydrophobic properties of the VOCs are described by an octanol-water partition coefficient (Kow). The results show that as the Kow increases, the Ks substantially increases while the Happ of the VOCs significantly decreases. The reduction of VOCs volatilization is possibly due to greater partitioning of the VOCs into surfactant micelles. The similar trend is also observed in the continuous operation. The results show that as the Kow increases, the percentage of VOCs removal and the Kxa decrease due to the VOCs’ hydrophobic effect. The removal percentages of the VOCs vary from 60 to 90%. The R2 of the log-log and semi-log relationships between Kow and studied parameters are observed in the range of 0.96-0.99.

Fabrication of Mesoporous Titanium Dioxide Assisted by Resorcinol/Formaldehyde Gel Mananya Thovicha; Varong Pavarajarn
ASEAN Journal of Chemical Engineering Vol 11, No 1 (2011)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Mesoporous structures of materials have attracted considerable attention recently because of their potential in a variety of applications. In this work, resorcinol/formaldehyde (RF) gel was used as a template for the synthesis of mesoporous titania, which is in great interest in catalysis, photocatalysis, gas sensor and photovoltaic applications. RF-gel was prepared by the sol-gel polycondensation of resorcinol (R) and formaldehyde (F). Titanium tetraisopropoxide (TTIP) was used as precursor for titania. However, direct incorporation of TTIP into RF-gel was limited by a spontaneous reaction between TTIP and RF gel, which consequently resulted in rapid solidification of the gel. Titania sol was firstly prepared from TTIP via sol-gel process. After certain period of aging time, the titania sol was added into RF mixture, which had been aged for predetermined period of time as well. After that, the mixture was further aged for another 36 hours before being dried at 80°C. Finally, the dried gel was calcined at 500°C for 4 hours to remove the RF template. The obtained titania powders were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), surface area measurement via nitrogen adsorption, and Fourier transform infrared spectroscopy (FTIR). The specific surface area of the samples was in the range of 30-33 m2/g. and the average diameter of about 8.8-37.7 nm. It was found that the rate of addition for titania sol into the RF-gel had influence on the phase of the final product. The increased rate favored the formation of titania in rutile phase.

Use of Electrochemical Peroxidation to Degrade Reactive Blue 19: Application of a 23 Full Factorial Design Sheila B. Austero1; Mark Daniel G. De Luna
ASEAN Journal of Chemical Engineering Vol 11, No 1 (2011)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

A 5000 g/m3 CI Reactive Blue 19 dye solution was treated using electrochemical peroxidation (ECP) process. This method involves the utilization of Fenton’s reaction chemistry through the addition of hydrogen peroxide into the solution and the use of an iron anode as source of Fe(II) catalyst. The degradation of the dye was evaluated using a 23 full factorial design augmented with four centerpoints. The factors and levels of the experimental design were as follows: initial pH (2.2, 2.5, 2.8), initial H2O2 dosage (332 mol/m3, 377 mol/m3, 422 mol/m3), and current density (164 A/m2, 205 A/m2, 246 A/m2). Results of the study showed that initial pH-current density interaction significantly influenced the percent COD removal. Moreover, after 60 minutes of treatment, the percent absorbance reduction reached up to 99.98% and the percent COD removal reached up to 82.83%.

Methanolysis of Jatropha Oil Using Conventional Heating Susan A Roces; Raymond Tan; Francisco Jose T Da Cruz; Shuren C Gong; Rison K Veracruz
ASEAN Journal of Chemical Engineering Vol 11, No 1 (2011)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Studies were carried out on the transesterification, also called methanolysis, of oil from the Jatropha curcas L. with methanol using conventional heating for the production of biodiesel. All reactions were carried out in a batch-stirred reactor and in the subsequent separation and purification stages. The high free-fatty acid (FFA) level of Jatropha oil was reduced to less than 1% by a two-step process. The first step was carried out with 12% w/w methanol-to-oil ratio in the presence of 1% w/w HCl as acid catalyst in a 2h reaction at 343K. The second step was carried out with variable parameters: temperatures at 318K and 333K, initial catalyst concentrations at 0.5% and 1.5%, methanol:oil molar ratios at 4:1 and 6:1, and reaction times at 1h and 2h. Gas chromatography analysis was used to determine the fatty acid profile of crude Jatropha oil. Methanolysis of Jatropha oil used the catalysts NaOH and KOH. The high FFA level of Jatropha oil was reduced from 6.1% to 0.7% after the first step process. The highest yield of fatty acid methyl esters (FAME), however, was achieved at 92.7% in 2h at 4:1 methanol:oil molar ratio, 1.5% w/w KOH, and 333K reaction temperature. This method produced biodiesel that met ASTM’s biodiesel standards. Results showed a density of 0.8g/ml that is within 0.86–0.9kg/l standard range and a kinematic viscosity of about 4.1cSt that is within 2–4.5cSt standard range. The flash point of the biodiesel samples fell between 169oC and 179oC while the cloud point averaged at 6oC.

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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

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

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