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All Journal Teknomekanik Equilibrium: Jurnal Ekonomi Syariah Bulletin of Chemical Reaction Engineering & Catalysis Rekayasa: Jurnal Penerapan Teknologi dan Pembelajaran
Veny, Harumi
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Religion Chemical Engineering, Chemistry & Bioengineering Chemistry Economics, Econometrics & Finance Mechanical Engineering Other

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Enzymatic Transesterification Using Different Immobilized Lipases and its Biodiesel Effect on Gas Emission Mohamad Nor, Nur Fatin Syafiqah; Veny, Harumi; Hamzah, Fazlena; Muhd Rodhi, Miradatul Najwa; Kusumaningtyas, Ratna Dewi; Prasetiawan, Haniif; Hartanto, Dhoni; Sulaiman, Sarina; Sazali, Rozana Azrina
Bulletin of Chemical Reaction Engineering & Catalysis 2024: BCREC Volume 19 Issue 2 Year 2024 (August 2024)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20143

Abstract

Biodiesel, a third-generation bio-fuels, offering several advantages over regular diesel fuel. Waste cooking oil (WCO) emerges as an ideal feedstock due to its availability and easy accessibility. In this work, biodiesel is utilized from two different types of immobilized lipases: Rhizomucor miehei lipase (RMIM) and Candida antarctica lipase B (CALB). The impact of the molar ratio of oil to methyl acetate (1:3-1:12) was evaluated for both lipases, and the resultant biodiesel was tested in diesel engine. The enzymatic transesterification was carried out in ultrasonic assistance and the results showed that the greatest yield of 81.20% at 45℃, using CALB as a biocatalyst, 1.8% (w/v) lipase and oil to methyl acetate molar ratio of 1:12 within 3 hours. Triacetin, by-product was determined their concentration for each molar ratio and analyzed using FTIR range of 500cm-1 to 4000cm-1, revealing a significant absorption peak at 1238.90cm-1. Biodiesel was blended with commercial diesel fuel in varying quantities of 7, 10, and 20% by volume (B20). The results were compared to Industrial Diesel Fuel 7% (B7) and Commercial Diesel Fuel 10% (B10). NOx and CO2 emission drops as the percentage of diesel/biodiesel blends increases, supporting WCO as a cost-effective biodiesel feedstock with low petrol pollution.
Optimization of Waste Cooking Oil’s FFA as Biodiesel Feedstock Primandari, Sri Rizki Putri; Arafat, Andril; Veny, Harumi
Teknomekanik Vol. 4 No. 1 (2021): Regular Issue
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (366.331 KB) | DOI: 10.24036/teknomekanik.v4i1.9072

Abstract

Waste cooking oil has high Free Fatty Acid (FFA). It affected on decreasing a biodiesel production. FFA reduction is one of important processes in biodiesel production from waste cooking oil. Thus, this study aimed to examine the optimum condition in FFA reduction. The process is assisted by using ultrasonic irradiation on acid esterification. Variables of the process are acid concentration, molar ratio of methanol and oil, and irradiation time. Meanwhile temperature irradiation on 45oC is a control variable. Process optimization is conducted by Response Surface Methodology (RSM) with Central Composite Design (CCD). The optimum conditions of response were 7.22:1 (methanol to oil molar ratio), 0.92% wt H2SO4, 26.04 minutes (irradiation time), and 45oC (irradiation temperature). Ultrasonic system reduced FFA significantly compared to conventional method.
Optimization of Water-in-Biodiesel  Emulsification of Palm Oil by Ultrasonic Method using  Respons Surface Methodology Fauzi, Dinda Adelia; Kusumaningtyas, Ratna Dewi; Widyastuti, Catur Rini; Veny, Harumi
Rekayasa Vol. 23 No. 1 (2025)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/rekayasa.v23i1.31831

Abstract

Palm oil biodiesel offers a renewable alternative but has high viscosity and density. Emulsifying biodiesel with water reduces these drawbacks and lowers nitrogen oxide (NOx) emissions. This study aims to optimize the emulsification process of water-in-biodiesel emulsion made from palm biodiesel (B100) using an indirect ultrasonic method and the response surface methodology approach with a Box-Behnken design. Three main independent variables were examined: hydrophilic-lipophilic balance values (6, 7.5, and 9), water concentrations (9%, 12%, and 15% v/v), and surfactant concentrations (5%, 7%, and 9% v/v) with a combination of Tween 80 and Span 80 as surfactants. The experimental process involves the synthesis of biodiesel from palm oil through transesterification with the help of 100W ultrasonic power for 15 minutes at room temperature. The analysis was carried out on three main parameters: density, viscosity, and water droplet size on water-in-biodiesel. The results of laboratory tests and statistical modeling show the three independent variables have a significant effect on the physical properties of water-in-biodiesel. The optimization resulted in the best conditions at a hydrophilic-lipophilic balance value of 6.11, water concentration of 9.06%, and surfactant concentration of 5%, with density characteristics of 859.95 kg/m³, kinematic viscosity of 4.44 mm²/s, and average water particle size of 4.46 μm, values close to conventional diesel fuel standards. This study confirms that the indirect ultrasonic method and respons surface methodology-based optimization are effective in improving the performance and character of water-in-biodiesel, potentially becoming a reference for the development of environmentally friendly renewable energy based on palm oil.
Sharia Service Strategy Model Based on Islamic Business Ethics Frastuti, Melia; Ritonga, Iskandar; Utami, Tri Niswati; Saputera, Satria; Veny, Harumi
EQUILIBRIUM Vol 13, No 2 (2025): EQUILIBRIUM
Publisher : Prodi Ekonomi Syariah Pascasarjana IAIN Kudus

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21043/equilibrium.v13i2.34907

Abstract

This study addresses the lack of an integrated model connecting Sharia compliance, Islamic business ethics, service quality, and social benefits in Islamic private hospitals. Using the Analytic Network Process (ANP) and expert judgments from hospital managers and regulators in Pekanbaru, the research develops a Sharia service strategy model grounded in Islamic business ethics.The findings show that Service Quality has the highest priority (0.261), followed by Maslahah (Social Benefits) (0.252), Sharia Compliance (0.246), and Islamic Business Ethics (0.241), indicating that all dimensions are equally important and mutually reinforcing. This study offers an original integrative framework that combines ethical, regulatory, operational, and social aspects, providing theoretical contributions to Islamic healthcare governance and practical guidance for strengthening Sharia-based hospital services.
Co-Authors Arafat, Andril Catur Rini Widyastuti, Catur Rini Dhoni Hartanto Fauzi, Dinda Adelia Frastuti, Melia Hamzah, Fazlena Haniif Prasetiawan Iskandar Ritonga Mohamad Nor, Nur Fatin Syafiqah Muhd Rodhi, Miradatul Najwa Ratna Dewi Kusumaningtyas Saputera, Satria Sarina Sulaiman Sazali, Rozana Azrina Sri Rizki Putri Primandari Utami, Tri Niswati