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Agus Aktawan
Contact Email
agus.aktawan@che.uad.ac.id
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chemica@che.uad.ac.id
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Kota yogyakarta,
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INDONESIA
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 10 Documents
Search results for , issue " Vol 2, No 2 (2015): Desember 2015" : 10 Documents clear
Analisa Perpindahan Panas dan Pengembunan pada Pengembunan Uap Cair dengan Pengembunan Parsial Bertingkat Setyawan, Martomo
CHEMICA: Jurnal Teknik Kimia Vol 2, No 2 (2015): Desember 2015
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (521.292 KB) | DOI: 10.26555/chemica.v2i2.4567

Abstract

Production of charcoal as an alternative fuel have been growth as the solution of the national problem about decreasing energy source from petroleum. Production of charcoal has a useful side product in the form of liquid smoke. The liquid smoke can be used as food preservative in the high grade of liquid smoke and the low grade liquid smoke can be used as wood preservative form termite. The conventional process on production liquid smoke it was using redistillation the raw liquid smoke from direct condensation. This process was consumed lot of energy. Liquid smoke consist of some components which had different boiling point.The aim of this research was to study the influence in using different combination of vertical condensor at the condensation of liquid smoke process fro the making coconut shell charcoal. This research was done by make some coconut shell charcoal and the smoke which was formed was flown passed some condensors.The result of this research shown that condensation of liquid smoke in the vertical condenser occured a contact  between condensation down flow and the vapour. The temperature of  the condensation taking point can be adjust by adjusting heat transfer area of the vertical condenser. The tar can be taken at the temperature above 100 0C. The colour of the liquid smoke was lighter with the lower temperature.
Pengaruh Suhu pada Pengeringan Tepung Kimpul (Xanthosoma sagittifolium) Sulistiawati, Endah; Santosa, Imam; APS, Yunizar Rizka; Saka, Arya Aji
CHEMICA: Jurnal Teknik Kimia Vol 2, No 2 (2015): Desember 2015
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (470.335 KB) | DOI: 10.26555/chemica.v2i2.4568

Abstract

Taro flour can be used as an alternative for wheat. This study aims to determine the optimal conditions on the operation of the drying resulting in minimal water content, but did not damage the properties of the desired material. This research will be obtained the parameters that can be used to design a dryer with a larger scale. After the taro peeled, washed, chopped and soaked with a solution of salt. Samples inserted into a dryer equipped with a balance, so that it can be read sample weight at a certain time. The drying process is stopped until the weight remains. The process of making flour baked, steamed after soaking the taro, and then do the drying process as the raw flour. The variables studied were temperature drying. The result showed that higher drying temperatures will accelerate the achievement of equilibrium moisture content, which means the drying operation requires a shorter period of time. Lower values of equilibrium moisture content on 0,02 (g water / g dry matter) can be achieved at a temperature of 90 0C, with a time of 80 minutes.
Proses Gasifikasi berbagai Jenis Biomassa pada Gasifier Downdraft Aktawan, Agus
CHEMICA: Jurnal Teknik Kimia Vol 2, No 2 (2015): Desember 2015
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v2i2.4564

Abstract

Biomass gasification is an endothermic reaction process for converting biomass into syngas. Gasification occurs at high temperatures with limited oxygen. Knowing the temperature profile of biomass gasification wood charcoal, coconut shell charcoal and coconut shell, rice husk and woodchip and seek optimal results from gasification of biomass are the purpose of the research. Research start by ignite the biomass in the gasifier, the air flows by blower and the syngas came out after the filter. Research variabel are variation of biomass types mentioned above. Observations were made up until the biomass in the gasifier did not produce syngas, characterized by gas results could not burn. The results of the temperature profile from gasification of various biomass shows that the syngas appeared in the early minutes (2 minutes until the 5th) on the gasification, such as gasification coconut shell, woodchip and rice husk. Syngas of coconut shell charcoal is 2,825% w/w of biomass and can burn for 19 minutes and resulted in 1,92% ash and 29,57% charcoal.
Kinetika Reaksi Poliesterifikasi Hidrolisat Shellac dan Anhidrida Ftalat Ditinjau Dari Reaktivitas Gugus Hidroksil Saputri, Lestari Hetalesi; Rochmadi, Rochmadi; Budhijanto, Budhijanto
CHEMICA: Jurnal Teknik Kimia Vol 2, No 2 (2015): Desember 2015
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (508.773 KB) | DOI: 10.26555/chemica.v2i2.4569

Abstract

This research presents polyesterification kinetics for shellac hydrolizate-phtalic anhydride. The polyesterification kinetics is proposed by assuming that the reaction  in ideal system, whereas the reactivity of the OH groups are considered different. Polyesterification was started from purification of shelllac by hydrolisis process. Hydrolisis was done by dissolving seedlac into NaOH solution and acidification with HCl. Polyesterification was conducted by reacting shellac hydrolizate with phtalic anhydride. Both of these materials were reacted in a three necked flask under vacuum condition. The reaction was conducted in temperature range of 130-170 0C and samples were taken every 30 minutes for a total of 5 hours, to determine the COOH concentration by titration. The investigation of reaction kinetic showed that reaction model  could describe the kinetic of polyesterification shellac hydrolizate-phthalic anhydride, especially for temperature below 150 0C. The reaction rate constants were obtained as follows:k1 = 19.7 e (-3802.82/T) g/mgek.menitk2 = 29.4 e (-4062.30/T) g/mgek.menit
Biodiesel dari Limbah Pabrik Gula dan Minyak Jarak Pagar (Jatropha curcas) dengan Katalisator Zeolit Alam Klinoptilolite Harjanti, Ratna Sri; Rahmanta, Anugrah Perdana
CHEMICA: Jurnal Teknik Kimia Vol 2, No 2 (2015): Desember 2015
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (487.964 KB) | DOI: 10.26555/chemica.v2i2.4565

Abstract

The fuel price increase with the increase of the number of transportation due to the increasing numbers of the population. Indonesia with more than 200 million people in need of transportation fuels in the form of gasoline and diesel in large quantities. Currently the main source of transportation fuels derived from petroleum. Premium production in Indonesia is about 62 million barrels and production of about 87 million barrels of diesel fuel. The product does not include the use for other needs, such as lubricating oil, kerosene, avgas, as well as other materials. This is particularly worrying given the oil reserves are dwindling. One of the alternative energy for transportation fuels is biodiesel as a substitute for diesel fuel.The castor oil has potential to be used as biodiesel. Fusel oil is a sugar mill waste containing alcohol. The reaction between castor oil and fusel oil with natural zeolite catalyst klinoptilolite be referred to as alcoholysis reactions that produce esters. Castor oil and fusel oil mixed with zeolite powder klinoptilolite that previously had been heated in a separate place until it reached its boiling temperature. Three neck flask fitted with a thermometer, hoses trailer makers, heater, and the agitator on 100 rpm with 100 oC of temperature. Snapshot taken at intervals of 30 minutes each. Conversion reaction calculated by analyzing the levels of glycerol bottom layer by means asetin. Alcoholysis fusel oil and castor oil with natural zeolite catalyst klinoptilolite produce esters that are approaching the properties of diesel oil with a calorific value of 19 119 Btu/lb. Optimum conversion of 57 % was obtained in alcohol - oil ratio of 9.29 mgek/mgek and the addition of a catalyst as much as 2.56% of the weight of oil.
Analisa Perpindahan Panas dan Pengembunan pada Pengembunan Uap Cair dengan Pengembunan Parsial Bertingkat Setyawan, Martomo
CHEMICA: Jurnal Teknik Kimia Vol 2, No 2 (2015): Desember 2015
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (521.292 KB) | DOI: 10.26555/chemica.v2i2.4567

Abstract

Production of charcoal as an alternative fuel have been growth as the solution of the national problem about decreasing energy source from petroleum. Production of charcoal has a useful side product in the form of liquid smoke. The liquid smoke can be used as food preservative in the high grade of liquid smoke and the low grade liquid smoke can be used as wood preservative form termite. The conventional process on production liquid smoke it was using redistillation the raw liquid smoke from direct condensation. This process was consumed lot of energy. Liquid smoke consist of some components which had different boiling point.The aim of this research was to study the influence in using different combination of vertical condensor at the condensation of liquid smoke process fro the making coconut shell charcoal. This research was done by make some coconut shell charcoal and the smoke which was formed was flown passed some condensors.The result of this research shown that condensation of liquid smoke in the vertical condenser occured a contact  between condensation down flow and the vapour. The temperature of  the condensation taking point can be adjust by adjusting heat transfer area of the vertical condenser. The tar can be taken at the temperature above 100 0C. The colour of the liquid smoke was lighter with the lower temperature.
Pengaruh Suhu pada Pengeringan Tepung Kimpul (Xanthosoma sagittifolium) Sulistiawati, Endah; Santosa, Imam; APS, Yunizar Rizka; Saka, Arya Aji
CHEMICA: Jurnal Teknik Kimia Vol 2, No 2 (2015): Desember 2015
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (470.335 KB) | DOI: 10.26555/chemica.v2i2.4568

Abstract

Taro flour can be used as an alternative for wheat. This study aims to determine the optimal conditions on the operation of the drying resulting in minimal water content, but did not damage the properties of the desired material. This research will be obtained the parameters that can be used to design a dryer with a larger scale. After the taro peeled, washed, chopped and soaked with a solution of salt. Samples inserted into a dryer equipped with a balance, so that it can be read sample weight at a certain time. The drying process is stopped until the weight remains. The process of making flour baked, steamed after soaking the taro, and then do the drying process as the raw flour. The variables studied were temperature drying. The result showed that higher drying temperatures will accelerate the achievement of equilibrium moisture content, which means the drying operation requires a shorter period of time. Lower values of equilibrium moisture content on 0,02 (g water / g dry matter) can be achieved at a temperature of 90 0C, with a time of 80 minutes.
Kinetika Reaksi Poliesterifikasi Hidrolisat Shellac dan Anhidrida Ftalat Ditinjau Dari Reaktivitas Gugus Hidroksil Saputri, Lestari Hetalesi; Rochmadi, Rochmadi; Budhijanto, Budhijanto
CHEMICA: Jurnal Teknik Kimia Vol 2, No 2 (2015): Desember 2015
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (508.773 KB) | DOI: 10.26555/chemica.v2i2.4569

Abstract

This research presents polyesterification kinetics for shellac hydrolizate-phtalic anhydride. The polyesterification kinetics is proposed by assuming that the reaction  in ideal system, whereas the reactivity of the OH groups are considered different. Polyesterification was started from purification of shelllac by hydrolisis process. Hydrolisis was done by dissolving seedlac into NaOH solution and acidification with HCl. Polyesterification was conducted by reacting shellac hydrolizate with phtalic anhydride. Both of these materials were reacted in a three necked flask under vacuum condition. The reaction was conducted in temperature range of 130-170 0C and samples were taken every 30 minutes for a total of 5 hours, to determine the COOH concentration by titration. The investigation of reaction kinetic showed that reaction model  could describe the kinetic of polyesterification shellac hydrolizate-phthalic anhydride, especially for temperature below 150 0C. The reaction rate constants were obtained as follows:k1 = 19.7 e (-3802.82/T) g/mgek.menitk2 = 29.4 e (-4062.30/T) g/mgek.menit
Proses Gasifikasi berbagai Jenis Biomassa pada Gasifier Downdraft Aktawan, Agus
CHEMICA: Jurnal Teknik Kimia Vol 2, No 2 (2015): Desember 2015
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v2i2.4564

Abstract

Biomass gasification is an endothermic reaction process for converting biomass into syngas. Gasification occurs at high temperatures with limited oxygen. Knowing the temperature profile of biomass gasification wood charcoal, coconut shell charcoal and coconut shell, rice husk and woodchip and seek optimal results from gasification of biomass are the purpose of the research. Research start by ignite the biomass in the gasifier, the air flows by blower and the syngas came out after the filter. Research variabel are variation of biomass types mentioned above. Observations were made up until the biomass in the gasifier did not produce syngas, characterized by gas results could not burn. The results of the temperature profile from gasification of various biomass shows that the syngas appeared in the early minutes (2 minutes until the 5th) on the gasification, such as gasification coconut shell, woodchip and rice husk. Syngas of coconut shell charcoal is 2,825% w/w of biomass and can burn for 19 minutes and resulted in 1,92% ash and 29,57% charcoal.
Biodiesel dari Limbah Pabrik Gula dan Minyak Jarak Pagar (Jatropha curcas) dengan Katalisator Zeolit Alam Klinoptilolite Harjanti, Ratna Sri; Rahmanta, Anugrah Perdana
CHEMICA: Jurnal Teknik Kimia Vol 2, No 2 (2015): Desember 2015
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (487.964 KB) | DOI: 10.26555/chemica.v2i2.4565

Abstract

The fuel price increase with the increase of the number of transportation due to the increasing numbers of the population. Indonesia with more than 200 million people in need of transportation fuels in the form of gasoline and diesel in large quantities. Currently the main source of transportation fuels derived from petroleum. Premium production in Indonesia is about 62 million barrels and production of about 87 million barrels of diesel fuel. The product does not include the use for other needs, such as lubricating oil, kerosene, avgas, as well as other materials. This is particularly worrying given the oil reserves are dwindling. One of the alternative energy for transportation fuels is biodiesel as a substitute for diesel fuel.The castor oil has potential to be used as biodiesel. Fusel oil is a sugar mill waste containing alcohol. The reaction between castor oil and fusel oil with natural zeolite catalyst klinoptilolite be referred to as alcoholysis reactions that produce esters. Castor oil and fusel oil mixed with zeolite powder klinoptilolite that previously had been heated in a separate place until it reached its boiling temperature. Three neck flask fitted with a thermometer, hoses trailer makers, heater, and the agitator on 100 rpm with 100 oC of temperature. Snapshot taken at intervals of 30 minutes each. Conversion reaction calculated by analyzing the levels of glycerol bottom layer by means asetin. Alcoholysis fusel oil and castor oil with natural zeolite catalyst klinoptilolite produce esters that are approaching the properties of diesel oil with a calorific value of 19 119 Btu/lb. Optimum conversion of 57 % was obtained in alcohol - oil ratio of 9.29 mgek/mgek and the addition of a catalyst as much as 2.56% of the weight of oil.

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