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CHEMICA Jurnal Teknik Kimia
ISSN : 2355875X     EISSN : 23558776     DOI : -
CHEMICA Jurnal Teknik Kimia ISSN, 2355-875X (print) 2355-8776 (online) is a journal that publishes manuscripts or scientific papers in Chemical Engineering. The scope of this journal covers chemical reaction techniques, separation, optimization, process control, process system engineering, waste treatment, food and material technology. Journals are published in print and online twice a year, in June and December by Chemical Engineering Program, Faculty of Industrial Technology, Universitas Ahmad Dahlan Yogyakarta.
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Articles 9 Documents
Search results for , issue " Vol 1, No 2 (2014): Desember 2014" : 9 Documents clear
A Study on The Ultrasonic Oil Extraction and Insitu Transesterification of Microalgae Biodiesel Wiyarno, Budi; Mohd Yunus, Rosli; Mel, Maizirwan
CHEMICA: Jurnal Teknik Kimia Vol 1, No 2 (2014): Desember 2014
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (501.779 KB) | DOI: 10.26555/chemica.v1i2.3569

Abstract

The extraction and transesterification of microalgae oil are interesting topics-besides culturing and microalgae strain- in the development process of biodiesel microalgae. This is an experimental laboratory study that was run using ultrasonic homogenizer Omni Ruptor 4000, examining the effect of type of solvent, solvent concentration, alga-solvent ratio, ultrasonic power, ultrasonic time, ultrasonic pulse and mixing toward yield. Based on Box-Behnken design, a quadratic model is developed to correlate the parameter to surface area to analyze certain factors and combination of dominant factors.The result shows that power, time and pulse as the most dominant factors that influence the yield. In the extraction, the combinations of pulse-time give better result than power-pulse combination. While in the in situ transesterification, the power-time combination give better result that power-pulse combination. Even though the optimum point has not been reached yet, in general the combination of power-time is categorized as the most influential combination to increase the yield.The experimental values versus predicted values use the model equation developed by STATISTICA Software version 6.0. A line of unit slope, the line of perfect fit with points corresponding to zero error between experimental and predicted values is also shown that the coefficient of correlation (R2) is 0.97977 (for extraction) and 0.98743 (for in situ). The density of Nannochloropsis sp is 0.924 g/ml, saponication number is 114, 269 KOH/1 g oil. The percentage of FFA is 19.67% consisting of monounsaturated and polyunsaturated Octadecenoic acid (C18:1) 43.49%, Dedecanoic acid (C12) 16.30%, Hexadecanoic acid (C16:0) 12.51%, Tetradecanoic acid (C14) 11.43%, Octadecadinoic acid (C18:2) 5.85% dan Octadecanoic acid (C18:0) 5.62%.
Modelling and Simulation of Fermentation Product Purification for Local Vinegar using Batch Distillation Bt Bakar, Faezah
CHEMICA: Jurnal Teknik Kimia Vol 1, No 2 (2014): Desember 2014
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (504.802 KB) | DOI: 10.26555/chemica.v1i2.3570

Abstract

Batch distillation has important due to its flexibility and capability to produce high purity product. The simulation of batch distillation columns during steady state operations is a very challenging modelling problem because of the complex dynamic behaviour. In order to verify this issue, simulation of this batch distillation column is to be performed by using computer aided design software and mathematical model .This study is required to model and simulate of fermentation product purification using batch distillation. This research was done by using graphical method and simulating by using MATLAB software that simple model had been presented. The results from these simulations were used as a basis to validate the results obtained (by others) experimentally. As conclusion, distillate and bottoms composition for ethanol drop gradually over time by using graphical method and the trend from simulation showed that the distillate and bottoms composition for ethanol increase and decrease over the time respectively. The declining trend was due to the unsteady state nature of batch distillation, where the lighter component at the bottoms will deplete over time.
Modifikasi Limbah Abu Layang menjadi Adsorben untuk Mengurangi Limbah Zat Warna pada Industri Tekstil Sutrisno, Bachrun; Hidayat, Arif; Mufrodi, Zahrul
CHEMICA: Jurnal Teknik Kimia Vol 1, No 2 (2014): Desember 2014
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (322.372 KB) | DOI: 10.26555/chemica.v1i2.3571

Abstract

Abundant supplies of coal make this compound as alternative fuels, especially for the industry. However, using of coal has shortcomings; incomplete combustion of coal produces solid waste that often called the fly ash. Results of mineral analysis showed that fly ash contain metal oxides such as silica (SiO2), alumina (Al2O3) and iron (Fe2O3). The presence of silica and alumina components allows fly ash to be synthesized into materials that have structure similar to zeolite. This material is known as zeolite like materials (ZLM).This study aims to synthesize ZLM of fly ash as adsorbent material. To determine the successful of synthesis also has been analyzed physicochemical properties of zeolite-like material. Then the results are used as adsorbent of textile dyes.The results showed that fly ash can be synthesized into zeolite-like material, this is indicated by the increasing of physicochemical properties. The experiment shown that the adsorption ability of fly ash in the reduction of textile dyes after modifiedis better.
Pemanfaatan Ekstrak Daun Mangga (Mangifera foetida L.) sebagai Penurun Asam Urat dalam Biji Melinjo Dewangga, Pramudia Bagus; Larasati, Ulys; Salamah, Siti
CHEMICA: Jurnal Teknik Kimia Vol 1, No 2 (2014): Desember 2014
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (593.199 KB) | DOI: 10.26555/chemica.v1i2.3572

Abstract

Melinjo plants including the types of old plants. Uric acid is the final metabolisme result of purine, purine is one of the components of nucleic acids contained in the body of the cell nucleus. Gout disease to result from consume excessive of purine substances. This reaserch to reduce uric acid levels in seeds melinjo order melinjo seeds can be processed into refined products chips with low uric acid using blanching method from mango leaf extract.This research was making young mango leaf extract using distillate water as a solvent. Melinjo seeds that have been peeled after then process blanching is carried out using a preliminary heating at a temperature of less than 80-90 °C for 8 minute , using young mango leaf extract. Water immersion Melinjo is filtered, then analyzed in the Clinical Pathologyn Laboratory University of Gadjah Mada.This research was conducted with seed weight variable 10, 20, 30, 40, 50, 60 grams. Other variabels such as differences in the length of time 20,40,60,80,100,120 minutes. From the preliminary data showed that levels of uric acid in the melinjo seed is 222 mg / 100 g.The result of this research were the highest decrease in uric acid levels using variable melinjo seed weight 10 gr with immersion time of 30’ is 17.86%. Using seed weight 10gr melinjo carried back to the old variable immersion study obtained results decreased levels of uric acid melinjo seed with most optimal immersion time is 100’ with a decrease of 18.43989%.
Karakteristik Torrefaksi dan Densifikasi Limbah Tandan Kosong Kelapa Sawit Maryudi, Maryudi
CHEMICA: Jurnal Teknik Kimia Vol 1, No 2 (2014): Desember 2014
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (855.656 KB) | DOI: 10.26555/chemica.v1i2.3573

Abstract

Energy demand increases continuously due to the growth of industries. Most industries still rely on fossil fuel that its price commonly increases and the deposit in the universe decreases since it is not renewable resource. Indonesia is the largest palm oil producer in the world that has potential abundance biomass of empty fruit bunch (EFB) of oil palm. It can be alternative energy source. The EFB is commonly used as fuel for heat source of boiler jn the palm oil plant. Most applications were by conventional combustion process that has disadvantage of low energy value. The EFB was only chopped and grinded, and then dried prior to combustion process. This study investigates improvement of energy quality of EFB through torrefaction (or light pyrolysis) and densification process.  The EFB was chopped in the small size and grinded in the form of fiber, then dried. The EFB fiber in small slices was pressed in a small steel tube and heated in the range of 200-300°C. The variables of study were duration and temperature of process. The initial heat value of EFB was 18,241 MJ/kg that slightly lower than its of kernel shell heat value 19.955 MJ/kg. The water content were found 6.28% and 4.31% for EFB and kernel shell respectively.  Results have shown that torrefaction and densification have improved the calorific value of EFB in the range of 6.58-16.71% of its initial value.  On the other hand, the energy yield has decreased to 97.54, 97.26 and 93.76% of its initial energy yield for torrefaction temperature of 200, 250 and 300°C respectively
A Study on The Ultrasonic Oil Extraction and Insitu Transesterification of Microalgae Biodiesel Wiyarno, Budi; Mohd Yunus, Rosli; Mel, Maizirwan
CHEMICA: Jurnal Teknik Kimia Vol 1, No 2 (2014): Desember 2014
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (501.779 KB) | DOI: 10.26555/chemica.v1i2.3569

Abstract

The extraction and transesterification of microalgae oil are interesting topics-besides culturing and microalgae strain- in the development process of biodiesel microalgae. This is an experimental laboratory study that was run using ultrasonic homogenizer Omni Ruptor 4000, examining the effect of type of solvent, solvent concentration, alga-solvent ratio, ultrasonic power, ultrasonic time, ultrasonic pulse and mixing toward yield. Based on Box-Behnken design, a quadratic model is developed to correlate the parameter to surface area to analyze certain factors and combination of dominant factors.The result shows that power, time and pulse as the most dominant factors that influence the yield. In the extraction, the combinations of pulse-time give better result than power-pulse combination. While in the in situ transesterification, the power-time combination give better result that power-pulse combination. Even though the optimum point has not been reached yet, in general the combination of power-time is categorized as the most influential combination to increase the yield.The experimental values versus predicted values use the model equation developed by STATISTICA Software version 6.0. A line of unit slope, the line of perfect fit with points corresponding to zero error between experimental and predicted values is also shown that the coefficient of correlation (R2) is 0.97977 (for extraction) and 0.98743 (for in situ). The density of Nannochloropsis sp is 0.924 g/ml, saponication number is 114, 269 KOH/1 g oil. The percentage of FFA is 19.67% consisting of monounsaturated and polyunsaturated Octadecenoic acid (C18:1) 43.49%, Dedecanoic acid (C12) 16.30%, Hexadecanoic acid (C16:0) 12.51%, Tetradecanoic acid (C14) 11.43%, Octadecadinoic acid (C18:2) 5.85% dan Octadecanoic acid (C18:0) 5.62%.
Modelling and Simulation of Fermentation Product Purification for Local Vinegar using Batch Distillation Bt Bakar, Faezah
CHEMICA: Jurnal Teknik Kimia Vol 1, No 2 (2014): Desember 2014
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (504.802 KB) | DOI: 10.26555/chemica.v1i2.3570

Abstract

Batch distillation has important due to its flexibility and capability to produce high purity product. The simulation of batch distillation columns during steady state operations is a very challenging modelling problem because of the complex dynamic behaviour. In order to verify this issue, simulation of this batch distillation column is to be performed by using computer aided design software and mathematical model .This study is required to model and simulate of fermentation product purification using batch distillation. This research was done by using graphical method and simulating by using MATLAB software that simple model had been presented. The results from these simulations were used as a basis to validate the results obtained (by others) experimentally. As conclusion, distillate and bottoms composition for ethanol drop gradually over time by using graphical method and the trend from simulation showed that the distillate and bottoms composition for ethanol increase and decrease over the time respectively. The declining trend was due to the unsteady state nature of batch distillation, where the lighter component at the bottoms will deplete over time.
Pemanfaatan Ekstrak Daun Mangga (Mangifera foetida L.) sebagai Penurun Asam Urat dalam Biji Melinjo Dewangga, Pramudia Bagus; Larasati, Ulys; Salamah, Siti
CHEMICA: Jurnal Teknik Kimia Vol 1, No 2 (2014): Desember 2014
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (593.199 KB) | DOI: 10.26555/chemica.v1i2.3572

Abstract

Melinjo plants including the types of old plants. Uric acid is the final metabolisme result of purine, purine is one of the components of nucleic acids contained in the body of the cell nucleus. Gout disease to result from consume excessive of purine substances. This reaserch to reduce uric acid levels in seeds melinjo order melinjo seeds can be processed into refined products chips with low uric acid using blanching method from mango leaf extract.This research was making young mango leaf extract using distillate water as a solvent. Melinjo seeds that have been peeled after then process blanching is carried out using a preliminary heating at a temperature of less than 80-90 °C for 8 minute , using young mango leaf extract. Water immersion Melinjo is filtered, then analyzed in the Clinical Pathologyn Laboratory University of Gadjah Mada.This research was conducted with seed weight variable 10, 20, 30, 40, 50, 60 grams. Other variabels such as differences in the length of time 20,40,60,80,100,120 minutes. From the preliminary data showed that levels of uric acid in the melinjo seed is 222 mg / 100 g.The result of this research were the highest decrease in uric acid levels using variable melinjo seed weight 10 gr with immersion time of 30’ is 17.86%. Using seed weight 10gr melinjo carried back to the old variable immersion study obtained results decreased levels of uric acid melinjo seed with most optimal immersion time is 100’ with a decrease of 18.43989%.
Karakteristik Torrefaksi dan Densifikasi Limbah Tandan Kosong Kelapa Sawit Maryudi, Maryudi
CHEMICA: Jurnal Teknik Kimia Vol 1, No 2 (2014): Desember 2014
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (855.656 KB) | DOI: 10.26555/chemica.v1i2.3573

Abstract

Energy demand increases continuously due to the growth of industries. Most industries still rely on fossil fuel that its price commonly increases and the deposit in the universe decreases since it is not renewable resource. Indonesia is the largest palm oil producer in the world that has potential abundance biomass of empty fruit bunch (EFB) of oil palm. It can be alternative energy source. The EFB is commonly used as fuel for heat source of boiler jn the palm oil plant. Most applications were by conventional combustion process that has disadvantage of low energy value. The EFB was only chopped and grinded, and then dried prior to combustion process. This study investigates improvement of energy quality of EFB through torrefaction (or light pyrolysis) and densification process.  The EFB was chopped in the small size and grinded in the form of fiber, then dried. The EFB fiber in small slices was pressed in a small steel tube and heated in the range of 200-300°C. The variables of study were duration and temperature of process. The initial heat value of EFB was 18,241 MJ/kg that slightly lower than its of kernel shell heat value 19.955 MJ/kg. The water content were found 6.28% and 4.31% for EFB and kernel shell respectively.  Results have shown that torrefaction and densification have improved the calorific value of EFB in the range of 6.58-16.71% of its initial value.  On the other hand, the energy yield has decreased to 97.54, 97.26 and 93.76% of its initial energy yield for torrefaction temperature of 200, 250 and 300°C respectively

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