Yohandri Bow
Chemical Engineering Department, State Polytechnic of Sriwijaya, Palembang, 30139, Indonesia

Published : 7 Documents
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Purification of Crude Glycerol from Biodiesel By-product by Adsorption using Bentonite Anzar, Erniati; Yusi, M. Syahirman; Bow, Yohandri
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 3, No 3 (2018): October 2018
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24845/ijfac.v3.i3.83

Abstract

The production of glycerol from biodiesel by-product that was obtained from waste cooking oil has low purity. This crude glycerol contains impurities such as methanol, catalyst, soap and water. Analysis result shows that crude glycerol contains 67.7% water, 16.7% ash with density 1.1217 g/mL. The impurities were able to be adsorbed using bentonite which was activated in sulphuric acids 1.5 M and characterized by SEM-EDX. The purified glycerol after being treated with bentonite at 60 C for 75 minutes was fulfilled The SNI 06-1564-1995 requirement i.e. 89.5% glycerol, 4.3% water, 3.6% ash and density 1.2212 g/mL. From the experiment can be concluded the activated bentonite showed a capacity in adsorbing and removing impurities in waste cooking oil.
Effect of DC Voltage on Prototype of Biodiesel Electrostatic Separator with Glycerin from Waste Cooking Oil Putra, Jaya Utama; Kalsum, Leila; Bow, Yohandri
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 3, No 3 (2018): October 2018
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24845/ijfac.v3.i3.89

Abstract

The limitations of fossil fuel support on fulfillment of energy need in a sustainable and environment friendly fashion has drove society to efforts of finding and developing fresh and renewably resources. Biodiesel is one the renewable energy resource and shows environment friendly property, consist of alkyl of fatty acids monoester originated from vegetable oil or animal fat.One of important steps in biodiesel production is separation of glycerin from product. Electrostatic method has been proved in accelerating saturation of glycerin. However, several aspects still need a careful assessment to acquire biodiesel production process with standard quality assigned. In this work, we designed an electrostatic separator of biodiesel from glycerin using waste cooking oil feed. The prototype was tested in several different voltages 12 Vdc, 20 Vdc, 30 Vdc and 33.5 Vdc. The result shows the highest voltage obtained is 33.5 Vdc, separation time 2 minutes 10 seconds having viscosity, water content and density i.e. 7.2139 cSt, 0.0321% and 0.85 g/mL respectively whereas flash point increase to 1917 C. The data confirmed that the product fulfills required standard value fordensity, water content and flash point.
APPLICATION OF NANOSILICA FROM RICE HUSK ASH AS IRON METAL (FE) ADSORBENT IN TEXTILE WASTEWATER Rusdianasari, Rusdianasari; Taufik, Muhammad; Bow, Yohandri; Fitria, Maryam Seyaski
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 5, No 1 (2020): February 2020
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

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Abstract

Heavy metals are considered hazardous to health if they accumulate excessively in the body. One way to remove iron metal ions by adsorption process uses adsorbents. In this study, removal of heavy metals such as ferrous metal (Fe) was adsorbed using an adsorbent in the form of nanosilica. Nanosilica is made from rice husk ash where rice husk ash contains 80-90% silica so that it can be utilized as a raw material in nanosilica synthesis. Synthesis of nanosilica was carried out using a solvent in the form of KOH with a variation of 1.5M concentration; 2.5M; 3.0M; 3.5M and 4.5M. The five types of nanosilica were applied to textile waste containing ferrous metal (Fe) with variations in a contact time of 5, 10, 15, 20, and 25 minutes. Waste containing iron metal that has been adsorbed was analyzed by atomic absorption spectrophotometry (AAS) to see the remaining iron content. From the analysis of AAS produced the smallest iron concentration of 0.186 ppm in nanosilica with 1.5 M KOH solvent. Nanosilica with 1.5M KOH solvent was characterized using a Scanning electron microscopy (SEM) -Energy Dispersive X-ray (EDX) tool to obtain a surface morphological size of 0.44 µm with 28.95% SiO2 content. 
RANCANG BANGUN ALAT PENGERING TIPE TRAY DENGAN MEDIA UDARA PANAS DITINJAU DARI LAMA WAKTU PENGERINGAN TERHADAP EXERGI PADA ALAT HEAT EXCHANGER Mahardhika, Lintang Putri; Lestari, Sutini Pujiastuti; Bow, Yohandri
KINETIKA Vol 7, No 1 (2016): KINETIKA 01032016
Publisher : Teknik Kimia Politeknik Negeri Sriwijaya

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Abstract

Drying is one way to remove or eliminate some of the water of a substance by evaporating most of the water contained through evaporation heat energy. The purpose of this research was to determine the length of time the drying of the moisture content of crackers and aware of any changes exergy of steam and changes exergy of air in the heat exchanger tools during the drying process. Exergy can be defined as the maximum employment potential in the form of material or energy that interacts with the environment. The longer the drying time then changes exergy of steam and changes exergy of air generated increased, this is due to the heat lost from the boiler so that it can affect the heat that will be up to the drying chamber. The more amount of the change exergy of steam and changes exergy of air, the lower the content of water in crackers. The water content in the crackers meet the standards of ISO 2713.1: 2009. At the time of 6 hours produces water content of 12.20%, at a time of 6.5 hours to produce 11.64% moisture content, at the time of 7 hours to produce 11.29% moisture content.
PREVENTION OF CORROSION RATE BY NATURAL INHIBITOR PAPAYA LEAF EXTRACT Bow, Yohandri
KINETIKA Vol 3, No 3 (2012): KINETIKA 01112012
Publisher : Teknik Kimia Politeknik Negeri Sriwijaya

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Abstract

Corrosion is an event of damage or deterioration of a metal caused by reaction with the environtment. Corrosion process can be prevented by the addition of corrosion inhibitor. Papaya leaf extract is an organic material that could potentially be used as a corrosion inhibitor because it contains N-acetyl- glukosamida and amino acid. The purpose of this study is  to determine the effects of brine concentration and surface area on the rate of corrosion of a metal plate that can be used as reference incorrosion control on metal plate. Determination of corrosion rate use weight loss methods, with medium marinade variation 3.5%, 5% and 6.5% salt water and a sample of the iron plates of different sizes. Each concentration of the medium contained four samples with different sizes of iron plates immersed for 30 days. The results showed the highest corrosion rate found on a metal plate without inhibitor with a value of 0.1331 mm/ year . The  greater concentration of the medium the corrosion rate will be higher. The smaller surface area of iron plate the corrosion rate will be higher.
ANALYSIS CHLORINE DISSLOVED WITH ELECTROMETRIC Bow, Yohandri
KINETIKA Vol 6, No 2 (2015): KINETIKA 01072015
Publisher : Teknik Kimia Politeknik Negeri Sriwijaya

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Abstract

Based on Clark type electrode, chlorine electrode has been made for measuring chlorine electrometrically. The electrode consisted of platinum working electrode, silver/silver chloride reference electrode, potassium chloride as an electrolyte, polyethylene polymer (32 ?m thick) membrane and the electrode body was made of polyester resin. The result of the study indicated that the sensor was suitable for determining the dissolved chlorine at optimum operating characteristics with an applied voltage of 0.9 Volt, using saturated solution of potassium chloride as an electrolyte. The steady state reduction current was achieved after 12 seconds. The standard calibration curve (concentration dissolved chlorine-reduction current) showed a linier relationship in the range of 2.9 ? 30 ppm. The analytical performance characteristic of the probe indicated: least square fitting test y = 0.4214x - 0.3714, sensitivity 0.3714 ppm/?A and detection limit 2.9 ppm.
PROTOTIPE PANEL SURYA BERBAHAN BAKU LIMBAH TRANSISTOR 2N3055 Bow, Yohandri
KINETIKA Vol 8, No 2 (2017): KINETIKA 01072017
Publisher : Teknik Kimia Politeknik Negeri Sriwijaya

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Abstract

Sebagai sumber daya alam yang melimpah, pemanfaatan energi matahari menjadi energi alternatif dapat dilakukan dengan Proses Konversi Energi matahari menjadi energi listrik (solar cell). Energi matahari masih belum banyak dimanfaatkan secara optimal dikarenakan harga panel surya yang masih mahal. Solar cell berkembang seiring dengan teknologi semikonduktor. Produk semikonduktor telah banyak bertaburan di perangkat alat ? alat elektronika salah satunya yaitu transistor. Satu transistor dapat menghasilkan tegangan sekitar 0,4-0,6 volt. Perancangan alat Prototype Power Suplay dengan bahan utama transistor 2N3055 sebanyak 96 buah. Dari hasil penelitian dan pengolahan data, Komposisi transistor tipe 2N3055 berdasarkan uji analisa SEM-EDX terdiri dari unsur Aluminium (Al) 45,55%, Carbon (C) 32,40%, Nb (Niobium) 13,42%, Zr (Zirconium) 7,02%, dan O (Oxygen) 1,61%. Faktor yang mempengaruhi efisensi panel sel surya yaitu rangkaian transistor, temperatur, intensitas cahaya, dan sudut kemiringan panel.