Intensifikasi Produksi Biodiesel Dan Bahan Kimia Lain Dari Dedak Padi Menggunakan Metode In – Situ Transesterikasi Tanpa Katalis Dalam Subkritis Air - Etanol

Naulina, Rosada Yulianti (2019) Intensifikasi Produksi Biodiesel Dan Bahan Kimia Lain Dari Dedak Padi Menggunakan Metode In – Situ Transesterikasi Tanpa Katalis Dalam Subkritis Air - Etanol. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Intensifikasi biodiesel dan produk kimia lainnya (etil levulinat) dari dedak padi menggunakan metode transesterifikasi *in situ* tanpa katalis dalam etanol–air subkritis telah dilakukan. Metode ini dikenal ekonomis karena dapat mengurangi tahapan percobaan dan ramah lingkungan karena tidak menggunakan katalis. Selain itu, metode ini tidak dipengaruhi oleh kandungan Asam Lemak Bebas (FFA) dan kadar air dalam dedak padi, sehingga tidak diperlukan proses *pretreatment*. Dalam penelitian ini, CO₂ digunakan sebagai gas bertekanan dan etil asetat sebagai *co-solvent* untuk meningkatkan hasil. Reaktor dilengkapi dengan pengaduk magnetik, kemudian dedak padi, air, etanol, dan etil asetat dengan perbandingan mol 1:10:9:2 dimasukkan ke dalam reaktor. Selanjutnya, gas CO₂ diinjeksikan untuk meningkatkan tekanan dan memastikan reaksi berlangsung dalam kondisi subkritis pada tekanan operasi 80 bar. Variasi suhu (120–200°C) dan waktu reaksi (1–4 jam) dilakukan untuk meningkatkan hasil biodiesel dan produk kimia. Hasil penelitian menunjukkan bahwa waktu reaksi yang lebih lama dapat meningkatkan hasil biodiesel dan produk kimia, dengan kondisi optimum pada suhu 200°C selama 3 jam yang menghasilkan rendemen sebesar 59,56%. Rendemen komposisi FAEE tertinggi diperoleh pada suhu 200°C selama 3 jam, yaitu sebesar 91,264%, sedangkan rendemen etil levulinat tertinggi diperoleh pada suhu 200°C selama 1 jam, yaitu sebesar 2,454%.
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Intensification of biodiesel and other chemical products (ethyl levulinate) from rice bran using an in-situ transesterification method without a catalyst in subcritical ethanol–water has been investigated. This method is considered economical because it reduces the number of experimental steps and is environmentally friendly because it does not use a catalyst. In addition, the method is not affected by the free fatty acid (FFA) content or moisture in the rice bran, so pretreatment is not required. In this experiment, CO₂ was used as a pressurized gas and ethyl acetate as a co-solvent to increase the yield. The reactor was equipped with a magnetic stirrer, and rice bran, water, ethanol, and ethyl acetate were added to the reactor at a molar ratio of 1:10:9:2. Subsequently, CO₂ gas was injected to increase the pressure and ensure that the reaction occurred under subcritical conditions at an operating pressure of 80 bar. The effects of temperature (120–200°C) and reaction time (1–4 hours) on biodiesel and chemical product yields were investigated. The results showed that a longer reaction time increased the yield of biodiesel and chemical products, with the optimum conditions obtained at 200°C for 3 hours, resulting in a yield of 59.56%. The highest FAEE yield was 91.264%, obtained at 200°C for 3 hours, while the highest ethyl levulinate yield was 2.454%, obtained at 200°C for 1 hour.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	rice bran, biodiesel, ethyl levulinate
Subjects:	T Technology > TP Chemical technology > TP339 Ethanol as fuel. Biomass energy.
Divisions:	Faculty of Industrial Technology > Chemical Engineering > 24101-(S2) Master Thesis
Depositing User:	Naulina Rosada Yulianti
Date Deposited:	22 Jul 2026 01:21
Last Modified:	22 Jul 2026 01:21
URI:	http://repository.its.ac.id/id/eprint/69379

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