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Agus Manggala
Politeknik Negeri Sriwijaya
Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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KONVERSI LIMBAH PLASTIK LDPE MENJADI BAHAN BAKAR CAIR (BBC) MENGGUNAKAN KATALIS ALUMINIUM OKSIDA DAN Arizal Aswan; Adi Syakdani; Agus Manggala; Ica Monika; Miranda Dwi Cendani
KINETIKA Vol. 12 No. 2 (2021): KINETIKA 01072021
Publisher : Politeknik Negeri Sriwijaya

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Abstract

According to data from the Kementerian Lingkungan Hidup dan Kehutanan (KLHK), the amount of waste in Indonesiain 2019 reached 68 million tons, and plastic waste is estimated at 9,52 million tons. Considering that the nature of plastic is difficult to decompose, it is necessary to handle environmentally friendly waste. One of the countermeasures for plastic waste is to convert it into liquid fuel through the pyrolysis process. The pyrolysis of LDPE plastic uses a catalytic cracking method with aluminium oxide and zeolite as catalyst. The independent variable of this study is the pyrolysis temperature variation. The temperature used are 150℃, 200℃, 250℃, 300℃, 350℃, 400℃, 450℃ and 500℃. The highest %yield using aluminium oxide was obtained at 350℃ is 8.34%, while higest %yield using zeolite was obtained at 500℃ is 10.5%.Based on the analysis conducted, it was found that the oil density using aluminium oxide was in the range746.66 kg/m3-815.61 kg/m3, when using zeolite oil density was in the range 0.72 gr/ml-0.758gr/ml. viscosity using aluminium oxide was in the range 2.143 mm2/s-2.730mm2/s and using zeolite was in the range 2.8893 cSt – 3.4589 cSt, flash point ranges from 26℃-32℃, calorific value using aluminium oxide using zeolite was 7587,1678 cal/gr and the results of pyrolysis oil using aluminium oxide and zeolite catalyst the GCMS analysis show that the highest percentage is the C8-C10 chain of 45.13% and 63%..
Pengembangan Aplikasi Tabel Uap Portabel yang Mengintegrasikan IAPWS-IF97 dan CoolProp untuk Analisis Termodinamika Agus Manggala; Muhammad Yerizam; Sahrul Effendy
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 4 No 3 (2025): Desember
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v4i3.351

Abstract

The advancement of modern thermodynamic technology requires educational software capable of accurately calculating and visualizing the thermophysical properties of water and steam in accordance with the IAPWS-IF97 Industrial Formulation. This study presents the development of a standalone Python-based Steam Table application that integrates two thermodynamic property calculation backends, IAPWS-IF97 and CoolProp, into a single executable (.exe) package that operates without any additional installation. The application performs real-time calculations of thermodynamic properties, including enthalpy, entropy, pressure, and temperature, and provides interactive visualizations on h–s (Mollier) and T–s diagrams. The novelty of this research lies in integrating dual thermodynamic engines into an automated build-release system based on batch scripting, enabling efficient, reproducible compilation, version control, and distribution. Validation results show that the application operates stably in Windows 10–11 environments without external dependencies, producing results consistent with the IAPWS-IF97 reference tables, with a maximum deviation of less than ±0.05% across all tested state points. This tool is expected to serve as a lightweight, open-source, and adaptable platform for thermodynamic learning and research, particularly for studies involving the Rankine cycle, steam power plants (PLTU), and geothermal energy systems.
Co-Authors Arizal Aswan Ica Monika Miranda Dwi Cendani Muhammad Yerizam Sahrul Effendy Syakdani, Adi