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All Journal Jurnal Teknik Kimia Journal of Physics: Theories and Applications International Journal of Mechanical Engineering Technologies and Applications (MECHTA)
Septiani, Eka Lutfi
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Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Education Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics

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BIODIESEL DARI MINYAK JARAK PAGAR DENGAN TRANSESTERIFIKASI METANOL SUBKRITIS Purnomo, Victor; Hidayatullah, Ach Syarifudin; Inam, AhJazilul; Prastuti, Okky Putri; Septiani, Eka Lutfi; Herwoto, Rifqi Putera
Jurnal Teknik Kimia Vol 14, No 2 (2020): JURNAL TEKNIK KIMIA
Publisher : Program Studi Teknik Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/jurnal_tekkim.v14i2.2032

Abstract

Percobaan bertujuan untuk mengetahui pengaruh temperatur, dan waktu reaksi terhadap yield dan kandungan biodiesel yang diproduksi dari tanaman jarak pagar (Jatropha curcas L.). Percobaan dilakukan dalam sebuah reaktor batch dengan kondisi reaksi rasio mol minyak dan metanol adalah 1:30 dengan variabel temperatur reaksi 125oC, 175oC, dan 225oC dengan waktu reaksi 2jam, 4jam, dan 6jam. Kemudian sampel akan dianalisis dengan uji FFA (Free Fatty Acid) dan GC (Gas Chromatography). Hasil analisis dapat digunakan untuk menentukan yield biodiesel. Peningkatan temperatur, menunjukkan bahwa nilai FFA cenderung menurun sedangkan nilai yield meningkat. Semakin lama waktu reaksi maka nilai FFA cenderung menurun sedangkan nilai yield meningkat. Total jumlah % area Methyl ester pada metode metanol subkritis 68,19% degan komponen terbesar adalah methyl oleat sebesar 38,108%. Nilai FFA terbaik pada rasio mol 1:30, temperatur 225 oC sebesar 2,12% sedangkan nilai yield terbaik pada rasio mol 1:30, temperatur 225 oC, waktu 6 jam sebesar 98,9%. Pada percobaan dapat diketahui nilai optimasi yang didapatkan pada variabel 1:30 dengan temperatur 225oC dan waktu 6jam pada pembuatan biodiesel dengan metode transesterifikasi minyak jarak (Jatropha curcas L.) dengan metanol pada kondisi subkritis. Kata kunci: biodiesel; metanol subkritis; minyak jarak (Jatropha curcas L.); transesterifikasi DOI : https://doi.org/10.33005/jurnal_tekkim.v14i2.2032
The Calculation of Expense Reduction based on the Efficiency of Cyclone by Computational Fluid Dynamic Wahyudi, Dhany Eko; Nuraini, Syarifa; Dewi, Wulandari Kusuma; Aisyah, Retno Mardiyah; Septiani, Eka Lutfi
International Journal of Mechanical Engineering Technologies and Applications Vol. 2 No. 2 (2021)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2021.002.02.1

Abstract

The rotary kiln in cement industries used hot air (temperature 14500C)  for doing a reaction to form a clinker. The outlet hot air from the combustion reaction in the kiln is reused to decrease the water content of coal in the coal mill. However, the hot air that contained ash will affect the drying process in the coal mills will not reach the maximum point. Therefore, the hot air needs treatment to separate the hot air and particle. The hot air is carried out to the cyclone. The goal of this study is to investigate the efficiency work of cyclones in cement industries using the CFD method. Besides, the other goal of this research will convey the expense that is reduced in decreasing the ash content in hot air. In general, the good cyclone has the low-pressure drop, the turbulence model using Reynold Average Navier Stokes (RANS) simulation,k-ε standard, with the Lagrangian model to solve the problem in particle lane. The result of this study is showing the pattern of the ash in cyclones,  the pressure in cyclones, and the efficiency of cyclones. The number of efficiencies will affect the reduction of expense in this section.
The Calculation of Expense Reduction based on the Efficiency of Cyclone by Computational Fluid Dynamic Wahyudi, Dhany Eko; Nuraini, Syarifa; Dewi, Wulandari Kusuma; Aisyah, Retno Mardiyah; Septiani, Eka Lutfi
International Journal of Mechanical Engineering Technologies and Applications Vol. 2 No. 2 (2021)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2021.002.02.1

Abstract

The rotary kiln in cement industries used hot air (temperature 14500C)  for doing a reaction to form a clinker. The outlet hot air from the combustion reaction in the kiln is reused to decrease the water content of coal in the coal mill. However, the hot air that contained ash will affect the drying process in the coal mills will not reach the maximum point. Therefore, the hot air needs treatment to separate the hot air and particle. The hot air is carried out to the cyclone. The goal of this study is to investigate the efficiency work of cyclones in cement industries using the CFD method. Besides, the other goal of this research will convey the expense that is reduced in decreasing the ash content in hot air. In general, the good cyclone has the low-pressure drop, the turbulence model using Reynold Average Navier Stokes (RANS) simulation,k-ε standard, with the Lagrangian model to solve the problem in particle lane. The result of this study is showing the pattern of the ash in cyclones,  the pressure in cyclones, and the efficiency of cyclones. The number of efficiencies will affect the reduction of expense in this section.
Microwave-assisted roasting time on Ilmenite Bangka Belitung extraction using hydrometallurgical method Mutakin, Ikbalul; Suryana, Risa; Septiani, Eka Lutfi; Arutanti, Osi; Widiyandari, Hendri
Journal of Physics: Theories and Applications Vol 8, No 1 (2024): Journal of Physics: Theories and Applications
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jphystheor-appl.v8i1.90259

Abstract

Titanium Dioxide (TiO2) was extracted from Bangka Ilmenite through a hydrometallurgical process employing the microwave-assisted method using a 20% HCl solution. The highest crystallinity percentage in XRD result, reaching 75%, was achieved after a roasting duration of 25 minutes, with a corresponding crystallite size of  35.57 nm at the TiO2-Anatase phase's peak intensity of 25.24°. Analysis of the extracted ilmenite revealed alterations in its compound composition, notably an increase in TiO2 content. The most substantial increase in TiO2 content, rising to 69.7% from 33.76%, was observed after 25 minutes of roasting. UV–Vis spectroscopy revealed an energy band gap of 2.329 eV.
Co-Authors Aisyah, Retno Mardiyah Arutanti, Osi Dewi, Wulandari Kusuma Hendri Widiyandari Herwoto, Rifqi Putera Hidayatullah, Ach Syarifudin Inam, AhJazilul Mutakin, Ikbalul Nuraini, Syarifa Prastuti, Okky Putri Risa Suryana Victor Purnomo Wahyudi, Dhany Eko