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All Journal Seminar Nasional Teknik Kimia Kejuangan Journal of Biobased Chemicals (JOBC) Jurnal Rekayasa Proses
Firman Kurniawansyah
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Engineering Environmental Science

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Aplikasi Teknologi Air Subkritis untuk Formasi Partikel Firman Kurniawansyah; A Roesyadi
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2018: PROSIDING SNTKK 2018
Publisher : Seminar Nasional Teknik Kimia Kejuangan

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Pemanfaatan Biomassa Sebagai Material Katalis untuk Proses Biorefinery Firman Kurniawansyah; Achmad Roesyadi
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2019: PROSIDING SNTKK 2019
Publisher : Seminar Nasional Teknik Kimia Kejuangan

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Pengembangan teknologi berbasis media air subkritis dan CO2 bertekanan untuk intensifikasi proses Firman Kurniawansyah
Jurnal Rekayasa Proses Vol 13 No 1 (2019): Volume 13, Number 1, 2019
Publisher : Jurnal Rekayasa Proses

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.41868

Abstract

Green solvent, an environmentally friendly solvent in form of subcritical water (SBCW) and pressurized CO2, has been used as media in process intensification. It has characteristic of having low or even zero toxicity. Hence it can simplify purification procedure. In this communication, development of technology applications of those green solvents, i.e. extraction, particle synthesis, and reaction engineering, is briefly presented. In general, studies show a positive utilization of green solvents of subcritical water and pressurized CO2. For example, in pectin extraction, yield up to 90% has been obtained when the combined solvent was used. In another application, hydrolysis using SBCW-CO2 as combined solvent has facilitated 100% conversion of pinene.
Reaction Kinetics and Catalytic Performance of KOH- Modified CaO in Tamanu Oil Biodiesel Production Sunarti, Aryelvia; Firman Kurniawansyah; Syuaibatul Islamiyah; Elva Febriyanti; Achmad Roasyadi; Muhammad Al Muttaqi; Reva Edra Nugraha
Journal of Biobased Chemicals Vol. 6 No. 1 (2026): Journal of Biobased Chemicals
Publisher : University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/jobc.v6i1.60003

Abstract

Biodiesel development as a renewable energy source continues to advance, reducing dependence on fossil fuels. Biodiesel is produced through esterification and transesterification reactions, aided by a catalyst, to increase the reaction rate. One of the main challenges in biodiesel production is selecting a catalyst that is highly active, stable, and easily separated from the product. Heterogeneous catalysts based on calcium oxide (CaO) are a promising alternative, especially when modified to enhance their catalytic performance. CaO has the weakness that it easily reacts with moist air to form calcium hydroxide (Ca(OH)₂). This process can decrease the catalytic activity of CaO. This research aims to determine the energy required for the transesterification reaction using a KOH-modified CaO catalyst in a batch process. A KOH-modified CaO catalyst was synthesized by calcining chicken eggshells and impregnating them with KOH. It was then used to produce biodiesel from tamanu oil through transesterification in a batch reactor. Characterization of the catalyst using the basicity test method showed a basicity value of 2.98 mmol/g benzoic acid, and using the Brunauer-Emmett-Teller (BET) method, obtained a surface area of 0.273 m²/g. The transesterification process was carried out at a mole ratio of oil to methanol of 1:3 at various temperatures of 55–75 °C and reaction times of 90, 120, and 150 minutes. The biodiesel produced was analyzed for free fatty acid (FFA) content, density, kinematic viscosity, yield, and reaction kinetics. The results showed that the optimum conditions were achieved at 65 °C and a reaction time of 120 minutes, yielding a biodiesel yield of 71.4%, and all quality parameters met the SNI 7182:2015 standard. Kinetic analysis showed that the transesterification reaction followed a zero-order kinetic model with an activation energy of 129.72 J/mol, indicating that the modified CaO catalyst effectively reduces the reaction energy barrier.
Co-Authors A Roesyadi Achmad Roasyadi Achmad Roesyadi Elva Febriyanti Muhammad Al Muttaqi Reva Edra Nugraha Sunarti, Aryelvia Syuaibatul Islamiyah