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IPTEK The Journal for Technology and Science
Published by Institut Teknologi Sepuluh Nopember Surabaya
ISSN : 08534098     EISSN : 20882033     DOI : -
Core Subject : Science,
Computer Science & IT
IPTEK The Journal for Technology and Science (eISSN: 2088-2033; Print ISSN:0853-4098), is an academic journal on the issued related to natural science and technology. The journal initially published four issues every year, i.e. February, May, August, and November. From 2014, IPTEK the Journal for Technology and Science publish three times a year, they are in April, August and December in online version.
Arjuna Subject : -
Articles 5 Documents
 1 
Search results for , issue "Vol 18, No 4 (2007)" : 5 Documents clear
Slurry Dewatering Process to Improve Quality of Low Grade Coal Hartiniati Hartiniati
IPTEK The Journal for Technology and Science Vol 18, No 4 (2007)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20882033.v18i4.163

Abstract

The upgrading Kalimantan low rank coal is performed using slurry dewatering process in a stirred batch autoclave (inner volume of 5 liters) equipped with a condenser, a pressure control valve (PCV), and a receiver. The experiment is carried out at 3.5 kg/cm2G nitrogen pressure, 250oC heater temperature and 150 rpm agitator speed. Kerosene and low sulfur waxy residue (LSWR) are used as oil solvents. The fluidity of slurry is studied with the ratio of oil to coal (O/C) at 1.5 to 2 wt/wt and the concentration of LSWR at 0.5 to 2% in oil. The temperature profile during operation is evaluated to investigate the process performance. Moreover, pH, TSS and TDS contents in water product is also analyzed. A centrifuge separator (cap. 200 gram, 1000 rpm) is used to remove oil in coal slurry, and it is found that almost all added oil can be recovered. The study suggests that calorific value of upgraded coal (as received basis) increases sharply from 5,178 kcal/kg to 7342 kcal/kg, following drastic reduction in total moisture, from 25,5% to 4,97%. The contents of ash, volatile matter and elements do not change very much from that of raw coal. This phenomenon shows that no chemical reaction occurs in the process. The wastewater from the process is clean enough thereby a simple wastewater treatment is required in commercial plant. Re-absorption test shows that stable moisture content in coal is achieved at 7.5 wt% for 13 days. The temperature profile suggests that the slurry dewatering process can be applied effectively to Kalimantan low rank coals producing excellent upgraded coal characteristics.
The Isotherm Adsorption of Cu2+ Ions in Aquoeus Solutions by Cross-Linked Chitosan-Cellulose Membrane Composite Santoso, Eko; Yuwono, Hendro; Ratnawati, Yohana
IPTEK The Journal for Technology and Science Vol 18, No 4 (2007)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20882033.v18i4.162

Abstract

The isotherm adsorptions of Cu2+ ions in aqueous solutions by cross-linked chitosan-cellulose composite membranes were investigated. The equilibrium isotherm adsorption studies were done in a batch system. The composite membranes have been prepared by coating 1 %, 2%, and 3 % (m/v) chitosan solution containing 1 % (m/v) acetic acid onto the grade 4 whatman paper filter and cross-linked by glutaraldehide. The effects of polyethylene glycol additive as a porogen agent of the composite membranes on the adsorption abilities were investigated also. The linear regression method was used to fit the adsorption data with the Langmuir model dan the Freundlich model. The fitting results show that the adsorption data more fit to the Langmuir model with the correlation coefficient value R2 higher than 0.97. The fitting of adsorption data to the Freundlich model result the correlation coefficient value R2 between 0.84–0.88. Furthermore, the Langmuir model was used to calculate the maximum adsorption capacity per surface area unit of the composite membrane (Qm) and the maximum adsorption capacity per weight unit of the composite membrane (Km). The results show that Qm increase with the increasing of chitosan concentration. The additions of PEG have increased Qm too. But 5% (m/v) PEG has increased Qm more higher than 10% (m/v) PEG. However, both the increasing of chitosan and the addition of PEG have decreased Km.
Synthesis of Mesoporous Carbons Derived from Hypercrosslinking of Divinylbenzene – 4-Vinylbenzyl Chloride Resin Wijaya, Ulfia
IPTEK The Journal for Technology and Science Vol 18, No 4 (2007)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20882033.v18i4.165

Abstract

Conducting polymer as the precursor for developing porosity carbon by hypercrosslinked resin networks represent promising material for electrochemical electrodes. 4-Vinylbenzyl Chloride at 90% technical grade and Divinylbenzene at 80% technical grade ware prepared for synthesizing homogeneous gel-type resins via suspension polymerization. Synthesize of hypercrosslinking resin which aimed to produce high porosity carbon was then done by inducing 1,2-Dichloroetane and Iron (III) Chloride. Product of resins was found has the specific surface area 1332 m2.g-1. According to this project, it can be concluded that high surface area of resin in the presence of carbon will yield carbon with high porosity which can increase effective plate area in the development of electrochemical capacitor.
Sodium Bisulfite as SO3 Source for Synthesis of Methyl Ester Sulfonate Using RBD Stearin as Raw Material Mansur, Dieni; Astrini, Nuri; Tasrif, Tasrif
IPTEK The Journal for Technology and Science Vol 18, No 4 (2007)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20882033.v18i4.161

Abstract

Methyl Ester Sulfonate (MES) is an anionic surfactant that be used for making cleansing products. MES is a biodegradable product because it is made from vegetable oil. MES can replace LAS (Linear Alkylbenzene Sulfonate) and AS (Alcohol Sulfate) that made from petrochemical substances. Process synthesis of MES was required the source of SO3 which can be obtained from sodium bisulfite. Various of process variables such as temperature and mole ratio between SO3 and methyl ester was required to get the optimal condition of sulfonation process using falling film reactor. In this research was obtained optimal temperature at 900C and mole ratio between sodium bisulfate and methyl ester was 1.6 : 1 giving active matter 32%. The qualities of obtained MES have near to the quality of MES of Chemithon and of LAS. Iod value and color of MES of Chemithon were 0.1–1 and 100 klett respectively while in this research was 6.11 for iod value and 135 klett for the color. Surface tension of LAS was 31.6 dyne/cm while MES as the experimental product rest at 50 dyne/cm.
Cascade Control Using Soft Sensor for Aldehide Column Energy Saving Totok R. Biyanto
IPTEK The Journal for Technology and Science Vol 18, No 4 (2007)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20882033.v18i4.164

Abstract

The focus of this paper is to develop the control strategy on aldehyde distillation column. The objectives are to maintain the consistency of product’s composition, energy saving and optimum cost. The method is replacing the control structure from inferential control to cascade control using LV structure, with soft sensor to improve performance, reduce cost and increase reliability. The disturbance was given by a change in the mole flow rate of feed. Cascade control with LV structure was proposed to minimize Internal Absolute Error (IAE) and increase energy efficiency. The result of this research showed that cascade control with LV structure had a lower Integral Absolute Error (IAE) than inferential control structure, improved product composition consistency, and increased energy efficiency.

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