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All Journal Eksergi: Chemical Engineering Journal Konversi
Wulandary, Indah Retno
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Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Education Industrial & Manufacturing Engineering Materials Science & Nanotechnology

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Production of Liquid Fuel from Motorcycle Used Tire via Pyrolysis: Effect of Temperature on Yield and Calorific Value Wulandary, Indah Retno; Octavia, Yona
Eksergi Vol 22 No 3 (2025)
Publisher : Prodi Teknik Kimia, Fakultas Teknik Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/eksergi.v22i3.14918

Abstract

The continuous accumulation of used tires has raised serious environmental concerns due to their non-biodegradable nature. Pyrolysis offers a promising thermal conversion method to transform used tires into alternative energy sources. This study investigates the pyrolysis of used motorcycle tires, cut into 1 x 1 cm pieces, under atmospheric pressure at various temperatures ranging from 400°C to 750°C, using 500 grams of tire material for each run. The tar and char yields were collected, and the calorific values of the liquid product were analyzed. The optimum operating condition was found at 700°C, yielding 276.56 g of tar and 184.55 g of char after 2 hours and 35 minutes of reaction. The highest calorific value obtained was 39.98 MJ/kg. Although the liquid fuel produced exhibits significant energy content, its calorific value remains lower than that of conventional fuels used in vehicles. This indicates the potential of tire-derived oil as a supplementary fuel, with further improvement needed in quality and performance.
Valorization of cassava peel starch into functional liquid glucose via acid-catalyzed hydrolysis using sulfonated carbon catalyst and red ginger (Zingiber officinale var. rubrum) extract Wulandary, Indah Retno; Laila, Noor; Dewi, Yuniza Shentiya; Ma'rifah, Yulia Nurul; Nata, Iryanti Fatyasari; Hadtimin, Ahmad Farhan
Konversi Vol 14, No 2 (2025): OCTOBER 2025
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/k.v14i2.24329

Abstract

The growing gap between sugar consumption and domestic product in Indonesia Highlights the need for alternative sweeteners derived from renewable resources. This study investigates the synthesis of functional liquid glucose from cassava peel starch through hydrolysis catalyzed by sulfonated carbon derived from palm empty fruit bunches (TKS-SO3H) and the enhancement of its antioxidant properties by red ginger extract. The TKS-SO3H catalyst was prepared via carbonization at 350 C followed by sulfonation at 180 C, yielding an H+ ion concentration of 1.745 mmol/g. Hydrolysis was conducted at 100 C for 60 minutes with a catalyst loading of 5% (b/v) and starch concentration ranging from 2.5 to 7.5%. The optimum glucose concentration of 4.14 mg/mL was achieved at 5% starch concentration, demonstrating the effective catalytic performance of TKS-SO3H. subsequently, liquid glucose was combined with red ginger extract in various volume ratios (1:1-1:4 v/v) to assess antioxidant capacity using the DPPH radical scavenging assay. The formulation with a 1:4 glucose-to-ginger ratio exhibited the highest scavenging activity of 48.63% after 10 minutes, indicating a significant enhancement of functional properties. The findings suggest that cassava peel, an agricultural by-product, can be utilized as a sustainable feedstock to produce bifunctional liquid glucose using an environmentally benign heterogeneous catalyst, contributing to the development of value-added and health-oriented sweeteners.
Co-Authors Dewi, Yuniza Shentiya Hadtimin, Ahmad Farhan Iryanti Fatyasari Nata, Iryanti Fatyasari Laila, Noor Ma'rifah, Yulia Nurul