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CHEMICA Jurnal Teknik Kimia

CHEMICA
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Published by Universitas Ahmad Dahlan

ISSN : 2355875X EISSN : 23558776 DOI : 10.26555

Core Subject : Science, Engineering,

Chemical Engineering, Chemistry & Bioengineering Energy

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 189 Documents

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Kajian Sifat Kimia dan Uji Sensori Tepung Ubi Jalar Putih Hasil Pengeringan Cara Sangrai Santosa, Imam; Winata, Andinni Putri; Sulistiawati, Endah
CHEMICA: Jurnal Teknik Kimia Vol 3, No 2 (2016): Desember 2016
Publisher : Universitas Ahmad Dahlan

Currently, the white-sweet potato (Ipomoea batatas L. Lam) has been developed as raw material of flour. The form of semi-finished sweet potato products is dry, durable, and has a long shelf life, such as dried cassava, fructose sugar, alcohol, various flour, starch. This form of semi-finished sweet potatoes can be developed into a variety of forms of processing that is done at the industrial level. The aims of this research were to determine the physical properties and examine the sensory test of sweet potato flour. The research was conducted by roasting at the temperature ofÂ 95-100 Â°C. The results showed that the flour had the water content of 7.63% and ash content of 1.998%. The sensory test performed in this study were color, odor, texture and shape ofÂ the white-sweet potato flour.

Study of thermal degradation of biomass wastes generated from palm oil milling plant Dewayanto, Nugroho; Azman, Anisa Najwa; Ahmad, Nur Atiqah; Mohd Shah, Mohammad Shahrul Harris
CHEMICA: Jurnal Teknik Kimia Vol 3, No 2 (2016): Desember 2016
Publisher : Universitas Ahmad Dahlan

Thermal decomposition of empty fruit bunch (EFB), palm kernel shell (PKS) and palm oil milling effluent sludge (POMES) have been investigated. Thermogravimetry analysis was employed to determine the proximate analysis of the samples, and then to study the characteristic of the thermal degradation. Proximate analysis of the sample was conducted by introduce the samples into the TGA and run it under the nitrogen environment from 25 to 800 Â°C. The gas was shifted to oxygen to let the sample burn and left their ash. Thermal degradation studies were carried out by heating up the samples in TGA from 25 to 800 Â°C at different heating ratio. Second order kinetic model was applied to determine the characteristic of the degradation.Â

Catalytic Pyrolysis of Biomass to Synthesize Bio-oil and Chemicals: A Review Dewayanto, Nugroho; Nordin, Mohd Ridzuan
CHEMICA: Jurnal Teknik Kimia Vol 2, No 1 (2015): Juni 2015
Publisher : Universitas Ahmad Dahlan

Increasing of global energy demand and depletion of fossil fuels reserves encourage people to search alternative energy resources. Biomass becomes promising candidate as alternative energy sources since their sustainability. Pyrolysis is one of method to convert biomass into bio-fuel. Almost all of biomass materials can be converted into products by pyrolysis process. However, quality of bio-oil produced by pyrolysis is still considered as low quality, due to their high oxygen content and acidity. This paper provides a critical review of catalytic pyrolysis of biomass to produce bio-oil with better properties. Types of catalysts are discussed in this manuscript, as well as their capability to reduce the oxygen content of product and enhance the properties of bio-oils.

Optimasi Proses Pengeringan Cara Sangrai Pada Pembuatan Tepung Ubi Jalar Dengan Suhu Terkendali Santosa, Imam; Sulistiawati, Endah
CHEMICA: Jurnal Teknik Kimia Vol 4, No 2 (2017): Desember 2017
Publisher : Universitas Ahmad Dahlan

Sweet potato (Ipomoea batatas L. Lam) potential to be used as industrial raw materials. Sweet potatoes have a high carbohydrate content that is in the fourth position after rice, corn, and cassava. Sweet potato flour can replace the function of wheat flour because when fermented with yeast will produce CO2 gas, which is needed in texture making and increase the volume of bread. As a raw material for cookies and cakes, the use of sweet potato flour can substitute 100% flour.The study offers a simple drying method and is expected to produce good quality sweet potato flour without chemical treatment. Small pieces or grated sweet potatoes will be roasted at a temperature and for a certain amount of time with oil bath-like tools until they are dry, then bolted.Over 250 grams of yam using a cheese solvent produces good dry chips. The best process at 100 0C takes 60 minutes, resulting in bright chip colors, sweet potato odor, flouriness, and a sweet tinge. 50 grams of purple, white, yellow and yellow honey consumed 90 minutes to 0% moisture content, yielding bright chip color according to original color, slightly sweet potato odor, flouriness, sweet tinge, 32-36,5% of rendemen.

Kombinasi Proses Filtrasi dan Ion Exchange Secara Kontinu pada Pembuatan Aquadm (Demineralized Water) Desmiarti, Reni
CHEMICA: Jurnal Teknik Kimia Vol 4, No 1 (2017): Juni 2017
Publisher : Universitas Ahmad Dahlan

Demineralized water is water free of dissolved mineral. Combination of filtration and ion exchanger processes were studied to treat demineralized water. The source of raw water is from Mountain Talang in District Solok. The study was conducted to investigate the effect of the amount of resin cartridge to electric conductivity (EC), pH and total dissolved solid (TDS).Â The flow rate was set at 50 ml/menit. The results showed that the number of resin cartridge 4 (2 anion and cation 2), the removal efficiency of EC and TDS achieved at 89.09% and 90.91%, respectively. As for the number of cartridges 6 (3 anions and cations 3), the removal efficiency of EC and TDS obtained at 95.45% and 96.36%, respectively.Â In addition, the effect of flow rate was also studied using cartridges resin 6 (3 anions and cations 3). Demineralized water has met the quality standard with a value of 0 ppm TDS, EC 0 Î¼S / cm, pH 7.5. This studies shown that the combination of filtration and ion exchange filtration process can use effectively to treat demineralized water with high quality standard.

Studi Konversi Pati Ubi Kayu (Cassava Starch) menjadi Glukosa secara Enzimatik budiarti, gita indah
CHEMICA: Jurnal Teknik Kimia Vol 3, No 1 (2016): Juni 2016
Publisher : Universitas Ahmad Dahlan

Cassava starch has potential as raw material for production glucose and fructose in Indonesia. Glucose of cassava starch can be used as substitute of cane sugar and synthetic sweetener. Glucose of starch production process includes acid hydrolysis and enzymatic hydrolysis. Enzymatic hydrolysis is usually used because non-corrosive, low reaction temperatures and no contaminate product of hydrolysis. Therefore, the purpose ofÂ this paper is to provide existing knowledge of steps process, factors influencing, kind of enzyme and sugar product from enzymatic hydrolisis of cassava starch .

KARAKTERISTIK ARANG AKTIF DARI TEMPURUNG KELAPA DENGAN PENGAKTIVASI H2SO4 VARIASI SUHU DAN WAKTU Jamilatun, Siti; Salamah, Siti; Isparulita, Intan Dwi
CHEMICA: Jurnal Teknik Kimia Vol 2, No 1 (2015): Juni 2015
Publisher : Universitas Ahmad Dahlan

Activated charcoal is charcoal that has activated for increasing its surface area by opening the pores so that increase the adsorption power. The surface area of the activated charcoal is between 300 and 3500 m2/g. Adsorption power from activated charcoal is very large, i.e. Â¼ to 10 times the weight of activated charcoal. Activated charcoal is a good adsorbent for the adsorption of gases, liquids, and solution. Characteristics of activated charcoal which are moisture content, ash content, and absorption of the iodine. Manufacture of activated charcoal begins with soaking for 24 hours using 2N H2SO4 solution, after it was drained and then roasted to remove the remaining water. Moisture content test was doing by weighing 1 gram of activated charcoal and then put it ini the oven at 105-1100C temperature for 120 minutes. Ash content test was by weighing 1 gram of activated charcoal and put in the furnace at a temperature of 5000C for 30 minutes, raise the temperature to 8150C for 90 minutes. Determination of the absorption of iodine is to weigh approximately 0.5 gram of activated charcoal and mix with 50 ml of iodine solution 0,1 N. Shake it for 15 minutes. Take 10 ml of the sample solution and titrate with natrim thio sulfate solution 0.1 N. Adding amylum solution of 1% as an indicator to the titration result becomes colorless.Pada penelitian ini dihasilkan kondisi optimum pada suhu pengovenan 1000oC selama 60 menit. Arang aktif yang didapatkan pada kondisi ini memiliki kemampuan adsorbsi yang baik dengan kadar penyerapan iod yang tinggi sebesar 529,94 mg I2/gram arang.In this research produced the optimum conditions of oven temperature 10000C for 60 minutes. Activated charcoal obtained under these conditions has a good adsorption capability with high levels of iodine absorption of 529.94 mg I2/g charcoal.

Tubular Biogas digester berbahan Buis Beton: Desain Konseptual, Potensi dan Analisa Ekonomi Budiman, Anatta Wahyu; Cahyadi, Muhammad; Pramono, Ahmad; Firdaus, Muchammad Yusuf; Azinuddin, Yazid Rizal; Prasetya, Riki Agung; Respati Saputra, Sofian Pradipta
CHEMICA: Jurnal Teknik Kimia Vol 4, No 2 (2017): Desember 2017
Publisher : Universitas Ahmad Dahlan

Biogas is becoming a main potential renewable energy resource that provides an environmentally friendly energy easily accessed by people in the rural area. So far, there are three main common concepts of biogas digester as the Fixed Dome biogas digester, the floating dome digester, and the Baloon Plastic digester. With their specific characteristics, the fixed dome and the balloon plastic digester are potential to be applied in Indonesia. In this work, the modification of fixed dome biogas digester concept using cylindrical concrete (buis beton) is introduced. This novel technology promises comparable strength and leaks free characteristics of fixed dome concept, with several benefits such as easier construction and more economical. A conceptual design toward economical aspects is presented in this manuscript.

Optimasi Pengambilan Antosianin dari Kulit Buah Naga Merah (Hylocereus polyrhizus) Sebagai Pewarna Alami pada Makanan Harjanti, Ratna Sri
CHEMICA: Jurnal Teknik Kimia Vol 3, No 2 (2016): Desember 2016
Publisher : Universitas Ahmad Dahlan

The addition of synthetic colors in foods in an attempt to attract the attention of consumers, not a ban, but if the dye used is a dye that is unusual for the food, it is harmful to health. One source of natural pigments that can be used is the red dragon fruit skin. These skins contain anthocyanins potential as a dye.Â Â Â Â Â Â Â Â Â Â Â Â In this reasearch, the observed red dragon fruit skin moisture content and size of the powder. It also conducted a stirring speed variation during the extraction process. While variable temperature, time, and solvent refers to the optimum conditions of research that has been done. Analysis of the results was conducted to determine pH, anthocyanin concentration and yield results.Â Â Â Â Â Â Â Â Â Â Â Â Based on the results obtained, the smaller the water content contained in the skin, giving absorbance values are higher. This shows that extractable anthocyanins levels are also higher. The lowest levels of the skin can be achieved in this study was 6%. The smaller the grain size, the higher the anthocyanin content. The smallest grain size achieved was 100 mesh. The highest mixing speed in this study was 300 rpm, the higher the stirring speed, the higher the anthocyanin content fetched.Â Â Â Â Â Â Â Â Â Â Â Â Organoleptic tests were conducted to study the effect of anthocyanins on the quality of the food shows that the addition of anthocyanins provide the appropriate color and do not significantly affect flavor and aroma. So it can be used as a natural dye for food.

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

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 contactÂ between condensation down flow and the vapour. The temperature ofÂ 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.

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Agus Aktawan

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agus.aktawan@che.uad.ac.id

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Journal Mail Official
chemica@che.uad.ac.id

Editorial Address
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Location
Kota yogyakarta,

Daerah istimewa yogyakarta

INDONESIA