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PENGARUH UKURAN PARTIKEL, WAKTU DAN SUHU PADA EKSTRAKSI FENOL DARI LENGKUAS MERAH Rondang Tambun; Harry P. Limbong; Christika Pinem; Ester Manurung
Jurnal Teknik Kimia USU Vol. 5 No. 4 (2016): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Galangal is one of spices containing phenol. This study aims to product phenol in a liquid phase from galangal. The variations performed in this study involve the time of extraction (3 hours, 6 hours, 9 hours), temperature (30 oC, 45 oC, 60 oC) and particle size of raw material (70 mesh, 100 mesh, 140 mesh). One of the analysis in this study is the yield of phenol. The highest phenol in this study is about 4,5%. This result is obtained using 140 mesh of tray at 60°C of temperature and 9 hours of extraction time.

Pengaruh Panjang, Bentuk, dan Jenis Batang pada Metode Pengapungan Batang dalam Mendeteksi Waktu Pemisahan Kerosin dan Air Tambun, Rondang; Silaen, Albert Novian; Banjarnahor, Indra Jaya; Mulia Rambe, Ahmad
Jurnal Teknik Kimia USU Vol. 9 No. 1 (2020): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v9i1.3711

This study aims to apply the Buoyancy Weighing-Bar Method in detecting the best separation time for emulsions consisting of two different liquid densities, namely kerosene and water. In this method, the change in mass of the rods that are hung on the emulsion will be measured over time. Changes in rod mass occur due to bubble mass transfer due to differences in liquid density. The study examined the effect of rod type, rod shape and rod length in determining the best separation time between kerosene and water with a concentration of 2% kerosene in 98% water. The types of rods used are aluminum, copper, bronze and iron with a variety of rod shapes, namely cylinders, rectangular prisms, hexagon prisms, and sheets. While variations in rod length are 210 mm, 160 mm, 110 mm and 60 mm. Based on the results obtained, the kerosene-water separation time can be determined by the Buoyancy Weighing-Bar Method. The most accurate type of rod in determining the best separation time between kerosene and water is bronze with a length of 210 mm. In the variation of the rod shape, the resulting separation times are close together for each shape.

Kombinasi Persamaan Rosin-Rammler dan Metode Pengapungan Batang (Buoyancy Weighing-Bar Method) pada Penentuan Distribusi Ukuran Gelembung Air dalam Kerosin Tambun, Rondang; Sijabat, Gabriella J J; Sidebang, Theresia J; Tambun, Bungaran
Jurnal Teknik Kimia USU Vol. 12 No. 1 (2023): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v12i1.11269

Droplet size distribution is one of the important physical parameters in the industry that use emulsions. In this research, a new method namely the Buoyancy Weighing-Bar Method is used to determine the droplet size distribution. In this research, droplet size distribution of kerosene in water is predicted which cannot be determined by the Buoyancy Weighing-Bar Method is carried out by using a combination of the Rosin-Rammler equation and measurement data by the Buoyancy Weighing-Bar Method. From the research results it was found that the combination of the Rosin-Rammler equation and the Buoyancy Weighing-Bar Method can be performed to predict the droplet size distribution of kerosene in water, and the results are comparable to the results obtained with the Coulter counter method. In the use of various types of bars, variations in bars shape and variations in bar length, the combination of the Rosin-Rammler equation and the Buoyancy Weighing-Bar Method can measure the droplet size distribution of kerosene in water.Â

Pengaruh Jenis Cairan, Jenis Batang, dan Panjang Batang pada Penentuan Distribusi Ukuran Partikel Bubuk Kaca Menggunakan Buoyancy Weighing-Bar Method (BWM) Panjaitan, Ari Fernando; Sirait, Anrocki; Tambun, Rondang
Jurnal Teknik Kimia USU Vol. 13 No. 1 (2024): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v13i1.15766

Particle size distribution is one of the important physical parameters in industry. A new method has been developed, the buoyancy weighing-bar method to determine the particle size distribution. This study examines the application of the buoyancy weighing-bar method for the determination of the particle size distribution of glass powder. Measurements were made by varying the type of liquid, the type of rod, and the size of the rod length. From this study, it was obtained that the best condition in determining the particle size distribution of glass powder is using aluminum rods with a length of 210 mm in 96% ethanol. The results of determining the particle size distribution of glass powder by using the buoyancy weighing-bar method at the best conditions are comparable to the results of determining the particle size distribution obtained using the settling balance method.

Pengaruh Panjang, Bentuk, dan Jenis Batang pada Metode Pengapungan Batang dalam Mendeteksi Waktu Pemisahan Kerosin dan Air Tambun, Rondang; Silaen, Albert Novian; Banjarnahor, Indra Jaya; Mulia Rambe, Ahmad
Jurnal Teknik Kimia USU Vol. 9 No. 1 (2020): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

This study aims to apply the Buoyancy Weighing-Bar Method in detecting the best separation time for emulsions consisting of two different liquid densities, namely kerosene and water. In this method, the change in mass of the rods that are hung on the emulsion will be measured over time. Changes in rod mass occur due to bubble mass transfer due to differences in liquid density. The study examined the effect of rod type, rod shape and rod length in determining the best separation time between kerosene and water with a concentration of 2% kerosene in 98% water. The types of rods used are aluminum, copper, bronze and iron with a variety of rod shapes, namely cylinders, rectangular prisms, hexagon prisms, and sheets. While variations in rod length are 210 mm, 160 mm, 110 mm and 60 mm. Based on the results obtained, the kerosene-water separation time can be determined by the Buoyancy Weighing-Bar Method. The most accurate type of rod in determining the best separation time between kerosene and water is bronze with a length of 210 mm. In the variation of the rod shape, the resulting separation times are close together for each shape.

Kombinasi Persamaan Rosin-Rammler dan Metode Pengapungan Batang (Buoyancy Weighing-Bar Method) pada Penentuan Distribusi Ukuran Gelembung Air dalam Kerosin Tambun, Rondang; Sijabat, Gabriella J J; Sidebang, Theresia J; Tambun, Bungaran
Jurnal Teknik Kimia USU Vol. 12 No. 1 (2023): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v12i1.11269

Droplet size distribution is one of the important physical parameters in the industry that use emulsions. In this research, a new method namely the Buoyancy Weighing-Bar Method is used to determine the droplet size distribution. In this research, droplet size distribution of kerosene in water is predicted which cannot be determined by the Buoyancy Weighing-Bar Method is carried out by using a combination of the Rosin-Rammler equation and measurement data by the Buoyancy Weighing-Bar Method. From the research results it was found that the combination of the Rosin-Rammler equation and the Buoyancy Weighing-Bar Method can be performed to predict the droplet size distribution of kerosene in water, and the results are comparable to the results obtained with the Coulter counter method. In the use of various types of bars, variations in bars shape and variations in bar length, the combination of the Rosin-Rammler equation and the Buoyancy Weighing-Bar Method can measure the droplet size distribution of kerosene in water.Â

Pengaruh Jenis Cairan, Jenis Batang, dan Panjang Batang pada Penentuan Distribusi Ukuran Partikel Bubuk Kaca Menggunakan Buoyancy Weighing-Bar Method (BWM) Panjaitan, Ari Fernando; Sirait, Anrocki; Tambun, Rondang
Jurnal Teknik Kimia USU Vol. 13 No. 1 (2024): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v13i1.15766

Particle size distribution is one of the important physical parameters in industry. A new method has been developed, the buoyancy weighing-bar method to determine the particle size distribution. This study examines the application of the buoyancy weighing-bar method for the determination of the particle size distribution of glass powder. Measurements were made by varying the type of liquid, the type of rod, and the size of the rod length. From this study, it was obtained that the best condition in determining the particle size distribution of glass powder is using aluminum rods with a length of 210 mm in 96% ethanol. The results of determining the particle size distribution of glass powder by using the buoyancy weighing-bar method at the best conditions are comparable to the results of determining the particle size distribution obtained using the settling balance method.

Quality Analysis of Biobriquettes Combination Ratio of Oil palm Frond and Water Hyacinth Waste with Durian Seed Flour Adhesive Sinaga, Mersi Suriani; Tambun, Rondang; Tjung, Melvan; Sitinjak, Dadi Oslar
Journal of Chemical Engineering Research Progress 2025: JCERP, Volume 2 Issue 2 Year 2025 December 2025 (Issue in Progress)
Publisher : UPT Laboratorium Terpadu, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/jcerp.20407

This study investigates the production of biobriquettes from a mixture of oil palm frond waste and water hyacinth using durian seed flour as a sustainable adhesive. Biobriquettes were fabricated with varying mass ratios of oil palm frond to water hyacinth (25:75, 50:50, and 75:25) and adhesive concentrations (5%, 10%, 15%, and 20%). Durian seed flour was selected for its starch content, offering an eco-friendly alternative to conventional adhesive like tapioca flour without competing with food resources. Slow primary carbonization (pyrolysis) was employed as the fabrication method. The produced biobriquettes were analyzed for moisture content, ash content, volatile matter, fixed carbon, and calorific value. The optimal formulation was identified at a 75:25 ratio of oil palm frond to water hyacinth with 15% durian seed flour adhesive, yielding a moisture content of 5.91%, volatile matter of 13.97%, ash content of 3.05%, fixed carbon content of 77.07%, and a calorific value of 6,400.78 cal/g. These results demonstrate the potential of durian seed flour as an effective adhesive and highlight the feasibility of utilizing agricultural and invasive biomass wastes to produce high-quality, sustainable biobriquettes. Copyright © 2025 by Authors, Published by Universitas Diponegoro and BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

Gasification of Coffee Parchment as Potential Method for Coffee Agro-Industry Waste Utilization Fona, Zahra; Setiawan, Adi; Irvan, Irvan; Tambun, Rondang; Fatimah, Fatimah; Hadiansyah, Muhammad; Ramadani, Zein
Jurnal Rekayasa Kimia & Lingkungan Vol 18, No 2 (2023): Jurnal Rekayasa Kimia & Lingkungan (December, 2023 )
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v18i2.33288

Coffee parchment is a lignocellulosic waste material which has a potential to transform into synthesis gas. This research aims to study the feasibility of coffee parchment conversion under downdraft gasification with auto-heating supply method. The temperature profile in each zone of the reactor was investigated as the effect of different equivalence ratio (ER) as well as the producer gas characteristics such as ignition time, flame duration, colour and temperature, carbon conversion and producer gas composition. Initially, coffee parchment collected from dehulling process was sun-dried three to four days. The gasification was ignited by firing ca. 300 g of wood charcoal inside the reactor before the coffee parchment loaded, then the reactor was tighly closed. Once the combustible gas was produced, the gasification time was measured. The result shows that the highest operational temperature inside the reactor was 715.66 C within the combustion zone. The biomass conversion tends to increase by the increasing of ER, but the producer gas might dilute by more carbon dioxide production, and nitrogen input into the producer gas which indicated by the flame duration, colour, and temperature. Introducing an ER of 0.3 into the gasification reactor has provided adequate amount of oxygen to convert the coffee parchment into producer gas. This investigation suggests that coffee parchment is feasible to be converted into syngas. However, providing an advance process integrated to cleaning system would be required in the future to obtain a fuel grade syngas.

Pembuatan Biofuel dari Palm Stearin dengan Proses Perengkahan Katalitik Menggunakan Katalis ZSM-5 Tambun, Rondang; Saptawaldi, Rangga P; Nasution, Muhammad Anshori; Gusti, Oktris N
Jurnal Rekayasa Kimia & Lingkungan Vol 11, No 1 (2016): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v11i1.4902

Bahan bakar fosil telah digunakan selama beberapa abad yang menyebabkan ketersediaannya semakin berkurang. Hal ini mendorong perlu dilakukan pengembangan baru di bidang energi. Indonesia merupakan salah satu negara penghasil minyak sawit terbesar di dunia. Minyak sawit ini dapat dikonversi melalui proses perengkahan katalitik menjadi biofuel yang ramah lingkungan karena tidak mengandung nitrogen dan sulfur seperti gasolin, kerosin dan diesel. Pada penelitian ini digunakan palm stearin sebagai bahan baku dengan katalis ZSM-5 yang memiliki luas permukaan 425 m2/g dan rasio Si/Al 50. Variabel yang divariasikan adalah suhu operasi dari 400oC - 450oC dan waktu reaksi dari 60 menit - 150 menit. Hasil penelitian menunjukkan yield liquid product (biofuel) tertinggi diperoleh sebesar 93,29% pada suhu 400oC saat waktu reaksi 60 menit, dengan komposisi C6-C12 sebesar 21,82%, C14-C16 sebesar 19,21% dan C18-C28 sebesar 58,97%.

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